tag:blogger.com,1999:blog-76903037000559233772024-02-19T07:23:21.531-08:00How to make and fly a RC plane, quadcopter and helicoptersA blog of my experiences and resources for other Radio Control plane enthusiasts.
This is a collection of free plans, design ideas, information about where to buy servos, motor, propeller, LiPo Battery, balsa wood, etc.Unknownnoreply@blogger.comBlogger4125tag:blogger.com,1999:blog-7690303700055923377.post-46879348112857162002014-06-26T11:14:00.001-07:002014-06-26T11:32:00.198-07:00RC Logger RC EYE One Xtreme - Review<div dir="ltr" style="text-align: left;" trbidi="on">
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<span style="background-color: white;"><span style="font-family: inherit;"><br /></span></span><span style="background-color: white;"><span style="font-family: inherit; text-align: justify;">RCLogger has been working on developing a brushles</span><span style="font-family: inherit; text-align: justify;">s mini quad-copter since early 2013. Hobbyist were asked to provide their input, thoughts and suggestions about what they would want in this forthcoming quad. Many hobbyist participated in the </span><a href="http://www.rcgroups.com/forums/showthread.php?t=1802117" style="color: #005fd8; font-family: inherit; text-align: justify; text-decoration: none;" target="_blank">discussion</a><span style="font-family: inherit; text-align: justify;"> and pre-orderd the </span><a href="http://www.rclogger.com/RC-EYE/RC-EYE-One-Xtreme/RC-EYE-One-Xtreme-Mode-2.html" rel="nofollow" style="color: #005fd8; font-family: inherit; text-align: justify; text-decoration: none;" target="_blank">RC EYE One Xtreme</a><span style="font-family: inherit; text-align: justify;">. The developers were collaborative and actively participated in these discussions and provided periodic updates to the RC community.</span></span><br />
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<b style="background-color: white; font-family: inherit; text-align: left;">Inside the box</b></div>
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<li><span style="font-family: inherit;">RC EYE One Xtreme</span></li>
<li><span style="font-family: inherit;">2.4 GHz Transmitter, AAA Battery for Transmitter</span></li>
<li><span style="font-family: inherit;">800 mAh LiPo Battery, USB LiPo Battery Charger</span></li>
<li><span style="font-family: inherit;">Set of propellers, Spinner, Spinner Washer</span></li>
<li><span style="font-family: inherit;">Trigger Cable, PPM Cable (for optional PPM receiver)</span></li>
<li><span style="font-family: inherit;">Operating instructions, Decals</span></li>
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<b style="background-color: white; font-family: inherit;">First Impression</b><br />
<span style="background-color: white; font-family: inherit; text-align: justify;">The product packaging is attractive and provides protection during shipping. Once you open the box - well built, professional grade, cool are the words that come to mind! The propellers are red & black in color, 138mm in length, but the airfoil is very unique (some may say, that it looks warped). The landing gear is a mix of black & red and are designed to help in flight orientation. The quad's brushless motors are about the size of a quarter.</span><br />
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<span style="background-color: white;"><span style="font-family: inherit; font-weight: bold;"><br /></span></span><span style="background-color: white;"><span style="font-family: inherit; font-weight: bold;">Transmitter</span></span><br />
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<span style="background-color: white; font-family: inherit;">The RTF package comes with a stock 2.4 ghz transmitter that is the size of a video-game remote controller (like an xbox controller). This runs on two AAA batteries that are provided in the package. The transmitter feels very light and fails to provide a decent grip. The control sticks are thick knobs which make precise flying/control a bit challenging. </span><i style="font-family: inherit;">UPDATE: After two months of owning the quad - I have grown accustomed to this transmitter.</i></div>
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<span style="font-family: inherit;"><span style="background-color: white;">The quad came with a LiPo battery that has a very unique connector (or atleast, I have never seen one like this from any other vendor). This LiPo can be charged with a USB charger that needs to connected to a source that outputs 5V and atleast 2 Amps. Took me about 50 minutes to charge the battery after a 5 minute flight.The product manual suggests NOT to use your laptop/computer to charge, as such, I am using a wall USB charger that came with the iPad.</span></span></div>
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<li style="text-align: justify;"><span style="font-family: inherit;"><b><span style="color: seagreen;">Beginner Mode</span></b>: Meant for flying indoor or in zero-wind conditions. I experienced stable flight and felt that the transmitter mellowed the control inputs. This mode would be ideal for the first-time quad flyer and also for experienced hobbyists who have never flown a brushless quad.</span></li>
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<li style="text-align: justify;"><span style="font-family: inherit;"><b><span style="color: darkorange;">Sport Mode</span></b>: This mode would be suitable for outdoor environment. The stock transmitter allows more control (in comparison to the beginner mode) and you can fly some sharp turns and figure 8s. The brushless motors have lot of power and the sport mode allows you to enjoy the raw power and maneuverability. In this mode, the quad can carry some payload (small camera) without being sluggish. </span></li>
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<span style="font-family: inherit;"><b><span style="color: darkred;">Advanced Mode</span></b>: I have not tried this mode as I am not comfortable using the stock transmitter to fly in this mode. I plan to use Lemon RX PPM receiver, but I am concerned that the Xtreme may act out-of-control (more about this later). </span><i style="text-align: left;">UPDATE: I flew the Xtreme in the Advanced Mode with the Stock Transmitter. In my experience this mode makes the quadcopter very agile and fast machine.</i></div>
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<b><span style="color: #660000; font-family: inherit;">Unboxing... literally !</span></b></h3>
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<span style="color: #660000; font-family: inherit;"><b>First look after unboxing</b></span></h3>
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<b><span style="color: #660000; font-family: inherit;">Flight Footage </span></b></h3>
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<span style="font-family: inherit;">I will post soon </span></div>
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<span style="font-family: inherit;">(you got to come back to check it out !)</span></div>
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<span style="font-family: inherit;"><b><span style="color: #660000;">On-board Video</span></b></span></h3>
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<b style="background-color: white; font-family: inherit;">Pros & Cons</b><br />
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<span style="background-color: white; color: green; font-family: inherit;">+ Cool factor<br />+ Brushless motors - long life<br />+ LED navigation lights - orientation assistance<br />+ Price: Value for money<br />+ Payload capacity - 100 gms (possibly able to carry a GoPro or Mobius)<br />+ Possible candidate for a mini FPV platform<br />+ Altitude hold feature<br />+ Start-up safety feature - motor arming feature</span><br />
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<span style="background-color: white; color: darkred; font-family: inherit;">- Battery connector - unique / proprietary<br />- LiPo charger - without a wall-charger<br />- Small transmitter </span><br />
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<b style="background-color: white; font-family: inherit;">Price</b></div>
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<span style="background-color: white; font-family: inherit;"><span style="font-family: inherit;">There are 3 models that you can purchase, namely, </span><a href="http://www.rclogger.com/RC-EYE/RC-EYE-One-Xtreme/RC-EYE-One-Xtreme-ArF.html" rel="nofollow" style="color: #005fd8; font-family: inherit; text-decoration: none;" target="_blank">ARF</a><span style="font-family: inherit;">, </span><a href="http://www.rclogger.com/RC-EYE/RC-EYE-One-Xtreme/RC-EYE-One-Xtreme-Mode-2.html" rel="nofollow" style="color: #005fd8; font-family: inherit; text-decoration: none;" target="_blank">RTF</a><span style="font-family: inherit;">, and </span><a href="http://www.rclogger.com/RC-EYE/RC-EYE-One-Xtreme/RC-EYE-One-Xtreme-OneLINK.html" rel="nofollow" style="color: #005fd8; font-family: inherit; text-decoration: none;" target="_blank">Anylink </a><span style="font-family: inherit;">for $109, $129 and $149 respectively (plus shipping)</span></span></div>
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<b style="background-color: white; font-family: inherit;"><b style="font-family: inherit;">Where to Buy</b></b></div>
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<span style="background-color: white; font-family: inherit;"><span style="font-family: inherit;">I purchased the Ready To Fly (RTF) model from one of the authorized distributors, </span><a href="http://www.rc-drones.com/rcl-eye-one-Xtreme.php" rel="nofollow" style="color: #005fd8; font-family: inherit; text-decoration: none;" target="_blank">RC-Drones</a><span style="font-family: inherit;"> for $130 shipped. I must mention, that RC-Drones answered my inquiry promptly and provided fast shipping (they are US based vendor). One can purchase the Xtreme directly from the </span><a href="http://www.rclogger.com/" rel="nofollow" style="color: #005fd8; font-family: inherit; text-decoration: none;" target="_blank">manufacturer's website</a><span style="font-family: inherit;"> (RTF, ARF, OneLink Combo), or from </span><a href="http://www.rclogger.com/Where-to-Buy/Find-an-RC-Logger-Distributor/North-America" rel="nofollow" style="color: #005fd8; font-family: inherit; text-decoration: none;" target="_blank">this list of distributors</a><span style="font-family: inherit;">.</span></span></div>
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<span style="font-family: inherit; font-size: small;">If you like my review, kindly share with your friends, family and social media.</span></h3>
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Unknownnoreply@blogger.comtag:blogger.com,1999:blog-7690303700055923377.post-72087488774808953302014-06-11T08:05:00.005-07:002017-08-29T14:33:04.371-07:00Quad Copters : 5 minute overview and recommendations from a Hobbyist<div dir="ltr" style="text-align: left;" trbidi="on">
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<span style="font-family: inherit;">What to buy: 5 minute overview and recommendation from a Hobbyist</span></div>
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<b><span style="color: #274e13; font-family: inherit;">Micro Size:</span></b></div>
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<li><span style="font-family: inherit;"><b>Blade Nano QX (RTF)</b>: $89 : 5"x5", weighs less than 18 grams, 4-6 minute flights, small enough to fly inside office/living room space, blade guards are provided as a safety feature for new pilots, has a sophisticated flight control software that keeps it stable during a hover. Developed and distributed by a popular US brand - parts are easily available at every local hobby shop and online. Designed for beginners - very easy to fly - does not require any prior training. Very little mass, thus does not result in damage during crash landings. Will help gauge user's interest and skills in flying quad copters.</span></li>
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<li><span style="font-family: inherit;"><b>HeliMax 1Si (RTF)</b>: $139, 5"x5", weighs 45 grams, 5-8 minute flight time, small enough to fly inside office/living room space, in built HD camera, innovative 'Return-To-Home' feature, stable flight characteristics. Developed and distributed by a major US brand - parts are easily available at every local hobby shop and online.</span></li>
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<li><span style="font-family: inherit;"><b>Hubsan X4 H107C (with 2 MP camera)</b>: $75 - $90: 5"x5", weighs less than 40 gms, 5-7 minute flight time, small enough to fly indoors or outdoors, in-built 2 MP camera, stable flight characteristics, designed for beginners and very easy to fly after reading the manual and/or watching a few Youtube videos. Developed and distributed by Chinese company - so parts are not available at local hobby shops but easily available online (Ebay, Amazon, etc).</span></li>
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<b><span style="color: #b45f06; font-family: inherit;">Mini Size:</span></b></div>
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<li><span style="font-family: inherit;"><b>Blade 180QX (RTF)</b>: $189: 9"x9", portable, 6-10 minute flight time, can be flown in indoors/ driveway/ backyard, brushed motors with gears, built-in camera provide ability to to capture HD images/videos. Developed and distributed by a popular US brand - parts will be easily available at any local hobbyshop. Very stable flight characteristics with three modes to allow the user to select flight performance.</span></li>
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<li><span style="font-family: inherit;"><b>RC Logger RC EYE ONE Xtreme (RTF)</b>: <a href="http://www.massiverc.com/PrestaShop/en/310-rc-logger-eye-one-xtreme-rtf-mode-2-.html" rel="nofollow" target="_blank">$130</a>: 9"x9", portable, 5-8 minute flight time, can be flown in the driveway/ backyard/park, small efficient brushless motors, can carry a small camera or upto 100 grams of payload. Developed and distributed by Hongkong based company - so parts are mostly available online. Three flight modes provide a comfortable learning experience as the user gets comfortable with the quad-copter.</span></li>
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<li><span style="font-family: inherit;"><b>Blade 200 QX</b>: $229+$129 : 6"x6", portable, 6-8 minute flight time, can be flown in the driveway/ backyard, small efficient brushless motors, need to purchase a transmitter (can be re-purposed on other RC helis/planes), can carry a small camera or upto 20 grams of payload. Developed and distributed by a popular US brand and parts will be easily available at any local hobbyshop. Designed for intermediate skilled flyers. However, it offers three flight modes to provide a gradual learning experience as the user gets comfortable with the quad-copter. This will be released on 06/14/14.</span></li>
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<b><span style="color: #660000; font-family: inherit;">Full Size:</span></b></div>
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<li><span style="font-family: inherit;"><b>350 QX (RTF):</b> $469: 30"x30", weighs 680 grams, 14 minute flight time, requires large backyard or a park, comes with full range transmitter that can be re-purposed to other planes/helis, built-in GPS return-to-home feature, built-in altimeter chip, large brushless motors, can carry a GoPRO camera or upto 100 gms of payload. Developed and distributed by a popular US brand and parts are easily available at any local hobbyshop. Three flight modes provide a comfortable learning experience as the user gets comfortable with the quad-copter.</span></li>
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<li><span style="font-family: inherit;"><b>Dji Phamtom FC40 (RTF)</b>: $499: 30"x30", weighs about 1200 gms, 20 minute flight time, requires large backyard or a park, comes with a full range transmitter but uses a proprietary 5.8Ghz frequency protocol, built-in GPS return-to-home feature, large brushless motors, beginner and advanced modes allow user to select flight performance, comes with an integrated digital camera that can controlled via any smartphone. Parts not available at every hobby shop, but can be easily purchased online. Very easy to fly and a stable quad-copter.</span></li>
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My Picks:</span></h3>
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<li><span style="font-family: inherit;"><b><span style="color: #274e13;">Micro Size</span>: </b>For someone with no RC flight experience, I would suggest the Blade Nano QX (RTF) for its ease of use, durability and value for money. </span></li>
<li><span style="font-family: inherit;"><b><span style="color: #b45f06;">Mini Size</span>:</b> For someone with some RC flight experience, I would suggest the RC Logger RC Eye One Xtreme for its powerful brushless motor, ability to carry a samll camera and the value for money. </span></li>
<li><span style="font-family: inherit;"><b><span style="color: #660000;">Full Size</span>: </b>For someone with previous quad copter flight experience, enjoys technology gadgets and wants a stable platform for aerial photography - I would suggest the 350 QX.</span></li>
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<b><span style="font-family: inherit;">If you like my review, kindly share with your friends, family and social media.</span></b></div>
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Unknownnoreply@blogger.comtag:blogger.com,1999:blog-7690303700055923377.post-18540573156125053712010-04-06T05:26:00.000-07:002017-08-29T14:38:19.618-07:00How I got interested in the hobby<div dir="ltr" style="text-align: left;" trbidi="on">
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<span style="font-family: inherit; margin-left: 1em; margin-right: 1em;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiBhDr4Iu7YD-3v931B118BhyOiwDtMp89O6SPdVvweZk1CfsQVUasYhybc6CH-MNkODTFiOGcIoNS_xo7qsevWjPPimFoMDHlJWbYq2i1KFS4wWuYW25_1DoKB4ozi-An1_6vI91QuewvB/s1600/Megatech+Skyliner.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="291" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiBhDr4Iu7YD-3v931B118BhyOiwDtMp89O6SPdVvweZk1CfsQVUasYhybc6CH-MNkODTFiOGcIoNS_xo7qsevWjPPimFoMDHlJWbYq2i1KFS4wWuYW25_1DoKB4ozi-An1_6vI91QuewvB/s320/Megatech+Skyliner.jpg" width="400" /></a></span></div>
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<span style="text-align: justify;">One day, I was bored at work and was watching a YouTube video of someone flying a Radio Control plane. So, I started thinking about building a RC plane. I read a few blogs (like this one), researched some </span><a href="http://indiahobby.blogspot.com/p/free-plans.html" style="text-align: justify;">free building plans,</a><span style="text-align: justify;"> saw a dozen more videos, joined a few online hobby forums and decided to build a basic plane that would FLY.</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEitwxsgVO2UkrDjKJD2TragOmc6VLE7-wooKF7bEvGHLq8PgPo0wbyWr_A9u7J1Zj3-ua5dy9axs_xqTiQqtLD0HXaKfCZR_jaSg5UtHulPz7nqnyiuQhBU8YcfYaaiWE-OMbhUjZHccTOa/s1600/100_0217.JPG" imageanchor="1" style="clear: right; margin-bottom: 1em; margin-left: auto; margin-right: auto;"><span style="font-family: inherit;"><img border="0" height="260" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEitwxsgVO2UkrDjKJD2TragOmc6VLE7-wooKF7bEvGHLq8PgPo0wbyWr_A9u7J1Zj3-ua5dy9axs_xqTiQqtLD0HXaKfCZR_jaSg5UtHulPz7nqnyiuQhBU8YcfYaaiWE-OMbhUjZHccTOa/s400/100_0217.JPG" width="400" /></span></a></td></tr>
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<span style="font-family: inherit;">Since I decided to build my own RC plane, I had been frantically looking for advice, guidance, websites, shops to procure the parts and electronics. I found that there is plenty of information out-there, but it is dispersed across the internet and secondly, there is a scarcity of <a href="http://indiahobby.blogspot.com/p/rc-hobby-shops-in-india.html">local hobby shops</a> catering to the amateur Radio Control modeler. So, I decided to write this blog - as a dairy of my experiences and as a resource to other RC enthusiasts. </span><br />
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Please browse through the site, learn from <a href="http://indiahobby.blogspot.com/p/learning-curve.html">my experience,</a> download build plans (free), and <a href="http://indiahobby.blogspot.com/p/contact-us.html">share your thoughts & ideas</a> with me and other hobbyists.</span></div>
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<span style="font-family: inherit;">This guide is intended to help give aero-modelers enough simplified knowledge to choose from the bewildering array of components available, and to assemble appropriate power systems for their model aero planes. This guide is not intended as an answer to everyone’s questions, but as a basic introduction so that we have a reference to help understand this subject. </span></div>
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<span style="font-family: inherit;"><b><span style="color: #660000;"><br /></span></b>
<b><span style="color: #660000;">Read this before using guide</span></b></span></div>
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<span style="font-family: inherit;">For those completely new to the world of aeromodeling who also intend building a new model, I suggest starting from the beginning of this guide. Even if it doesn’t all make sense at first, it will eventually. Some trial and error might not seem like the most economical way of learning but it can sometimes be the most effective.</span></div>
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<span style="font-family: inherit;">Choosing a power system is a more complicated procedure than I first thought when I started putting this guide together. Often choosing a power system includes a fair bit of educated guesswork. Although it is possible to accurately calculate every important bit of data to determine the optimum power system for a model, most of us will prefer the “educated guess” approach. Unfortunately there is some knowledge required to make an “educated guess”, and that is hopefully what this guide will provide.</span></div>
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<span style="font-family: inherit;">Many people will only want to access certain information, so each topic has a heading. Scroll down to see if you can find the information you need.</span><br />
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<b><span style="color: #660000; font-family: inherit;">What is Wing Loading and Stall Speed ?</span></b></div>
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<span style="font-family: inherit;">Wing loading is the loaded weight of an aircraft divided by the area of the wing. It is broadly reflective of the aircraft's lift-to-mass ratio, which affects its rate of climb, load-carrying ability, and turn performance.</span></div>
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<span style="font-family: inherit;">Many aeromodelers try their hardest to make models as light as possible. This is because a model with a light wing loading is easier to fly as it has a slower stall speed. In a banked turn an aeroplane is subjected to a gravitational force (G) which increases its weight, the same as a weight on the end of some string gets heavier if you spin it around like a lasso. The heavier the wing loading in a banked turn, the higher the stall speed gets. Other factors that can affect the stall speed of a model aero plane are aerofoil shape and aspect ratio. The only way of giving a heavy model a light wing loading is to increase the size of the wings. So a model with a high wing loading will have a high stall speed, which will become even higher in high G maneuvers. Because we land our models at or slightly above their stall speed, a model with a high wing loading will have a high landing speed which can call for some very good piloting skills.</span></div>
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<span style="font-family: inherit;">Wing loading is usually calculated in the form of oz/ft² or gr/dm²,1 dm² = 15.50003 inch². If you want to calculate the wing loading of your model, <a href="http://www.coloradogliders.com/wingloadingcalculator.htm." rel="nofollow" target="_blank">try this calculator</a> </span></div>
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<b><span style="color: #660000; font-family: inherit;">Relationship between Volts, Amps and Watts - Explained</span></b></div>
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<span style="font-family: inherit;">The most important terms you need to understand when choosing components for your electric model are Volts, Amps and Watts. Here is the "Hydraulic analogy" from Wikipedia which explains these terms in a simple way.</span></div>
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<span style="font-family: inherit;">"The hydraulic analogy is sometimes used to explain electric circuits by comparing them to water-filled pipes, voltage is likened to water pressure - it determines how fast the electrons will travel through the circuit. Current (in amperes), in the same analogy, is a measure of the volume of water that flows past a given point, the rate of which is determined by the voltage, and the total output measured in watts. The equation that brings all three components together is: volts × amperes = watts".</span></div>
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<span style="font-family: inherit;">As we will see, the size and efficiency of a motor and the load imposed on it by the propeller affects the Volts and Amps. The idea is to choose a motor, battery, esc and propeller combination that will fly your model in a desired manner within the specifications of the components, preferably at around the peak efficiency of the motor. This will be covered in more detail in the following sections.</span></div>
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<b style="line-height: 115%;"><span style="color: #660000; font-family: inherit;">Choosing a Motor</span></b></div>
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<span style="color: #660000; font-family: inherit; line-height: 115%;"><b style="line-height: 115%;">Weight Power and Dimensions</b></span><br />
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<span style="line-height: 115%;"><span style="font-family: inherit; line-height: 115%;">The most important thing to keep in mind before choosing a motor is its weight and dimensions. We would all agree that extra weight added to a model to achieve the correct centre of gravity is undesirable. I personally would prefer to have a larger, heavier and more powerful motor than a smaller less powerful motor and a lump of lead in my models. Sometimes there is no choice but to use lead, but just don’t forget about the relationship between the weight of your motor and the centre of gravity of your model. The dimensions of a motor are obviously important. Don’t buy it if it won’t fit in your model.</span></span></div>
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<span style="line-height: 115%;"><span style="font-family: inherit; line-height: 115%;">You will want a level of performance suitable for the type of model you are powering. A 3D model will need thrust greater than 1:1, and a scale WW1 biplane will need considerably less. Here is a table giving performance in Watts per pound. Remember that if you are running your motor above its maximum efficiency the Watts per pound rule won’t be accurate, as a higher percentage of the Watts going into the motor will be producing heat instead of power.</span></span></div>
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<li style="text-align: justify;"><span style="font-family: inherit; line-height: 115%;"> 70-90 watts/lb. Trainer and slow flying aerobatic models.</span></li>
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<li style="text-align: justify;"><span style="font-family: inherit; line-height: 115%;"> 90-110 watts/lb. Sport aerobatic and fast flying scale models.</span></li>
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<li style="text-align: justify;"><span style="font-family: inherit; line-height: 115%;"> 110-130 watts/lb. Advanced aerobatic and high speed models</span></li>
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<li style="text-align: justify;"><span style="font-family: inherit; line-height: 115%;"> 130-150 watts/lb. Lightly loaded 3D models and ducted fans.</span></li>
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<li style="text-align: justify;"><span style="font-family: inherit; line-height: 115%;"> 150-200+ watts/lb. Unlimited performance 3D models.</span></li>
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<li style="text-align: justify;"><span style="font-family: inherit; line-height: 115%;"> 10 X 1000 mA/1000 = 10 Amps</span></li>
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<li style="text-align: justify;"><span style="font-family: inherit; line-height: 115%;"> 10 X 1700 mA/1000 = 17 Amps</span></li>
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<li style="text-align: justify;"><span style="font-family: inherit; line-height: 115%;"> 10 X 2000 mA/1000 = 20 Amps</span></li>
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<span style="line-height: 115%;"><span style="font-family: inherit; line-height: 115%;">Now you have an idea of the weight and power you will need for your model, what sort of motor is best, an inrunner or outrunner? Both have their pros and cons.</span></span></div>
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<span style="color: #660000; font-family: inherit; line-height: 115%;"><b style="line-height: 115%;">Inrunners</b></span></div>
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<span style="line-height: 115%;"><span style="font-family: inherit; line-height: 115%;">Inrunners are constructed with the magnets attached directly to the shaft, which is surrounded by the copper windings. Because the magnets are close to the shaft it spins very quickly. This means they produce high rpm but low torque. This high rpm can be converted into torque by using a gearbox (see the section below on gearboxes).</span></span></div>
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<span style="line-height: 115%;"><span style="font-family: inherit; line-height: 115%;">Inrunners are more efficient and powerful, but need a gearbox to drive large propellers. They produce high revs per volt (Kv) compared to outrunners. For models requiring a small prop running at high speed like a Zagi (wing), pylon racers and ducted fans, inrunners without gearboxes are popular. Once a gearbox is used there are even more pros and cons. Gearboxes are an extra expense, require maintenance and can be noisy, but you will still get the best efficiency and power with a geared inrunner spinning a large prop. This is the reason why all competitive F5b models still use geared inrunners.</span></span></div>
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<span style="line-height: 115%;">Outrunners are constructed with the copper windings on the inside. The shaft is attached to a “bell”, or casing that contains the magnets, which spin around the copper windings. Because the extra weight of the bell and magnets are further out from the shaft it acts like a flywheel. Generally outrunners produce lower RPM at higher torque than inrunners due to the way they are made. This enables an outrunner to spin a larger prop without a gearbox.</span></div>
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<span style="line-height: 115%;">This means no maintenance, quieter operation and cheaper purchase price (no gearbox). These factors outweigh the higher efficiency and power of the inrunner for most sport flyer's.</span></div>
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<b style="line-height: 115%;"><span style="color: #660000;">kv</span></b></div>
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<span style="line-height: 115%;">kv is simply the revolutions per minute (rpm) an electric motor will spin at per per volt when under no load. You could think of high and low kv like the difference between a high performance 2 stroke racing motorcycle engine compared to a 4 stroke Harley Davidson motorcycle engine. Just say they put out approximately the same horsepower, but the 2 stroke does it at 11,000rpm and the 4 stroke does it at 3,000 rpm. The same can usually be said for high and low kv electric motors. Assuming the same voltage, a high kv inrunner with a small diameter propeller would be perfect for a high speed model like a pylon racer, and a low kv motor with a large diameter prop will be better for power i.e. getting a sailplane to altitude, or 3D manoeuvres like prop hanging. Kv is determined by the number of winds or turns. This is the amount of times the copper wire has been wound around each stator pole. More winds = low kv, less winds = high kv.</span></div>
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<b style="line-height: 115%;">kv has two main implications</b></div>
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<span style="line-height: 115%;">A high kv motor will spin faster than a low kv motor at the same voltage. This means you may choose to use a high kv motor if you are limited to a lower voltage battery pack. An example of this would be in 7 cell glider competition (7 NiMh or NiCd cells at 1.2 volts a cell = 8.4 volts). A lower kv motor could not produce enough rpm at 8.4 volts to be competitive, so a higher kv motor is used.</span></div>
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<span style="line-height: 115%;">If you are not limited to a particular voltage, a lower kv motor can be used at higher rpm by using a higher voltage. Large outrunners with a kv of 200 to 300 are a good example of low kv high voltage motors. Make sure you consider the voltage limit for any motor you are considering.</span></div>
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<b style="line-height: 115%;"><span style="color: #660000;">Gearboxes </span></b></div>
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<span style="line-height: 115%;">Choosing an inrunner and a gearbox isn't as complicated as it sounds, it is basically the same as choosing an outrunner but you add the downshift of the gearbox to the calculation.</span></div>
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<span style="line-height: 115%;">When choosing an inrunner you usually have two sizes to choose from. I'll use Feigao for this example, Feigao have their motors listed on their site (http://www.feigao.com/sdp/85838/4/main-102731.html) with a complete set of numbers on every motor and they even have suggestions for different set-ups. Feigao call their smaller diameter motors (27.6mm) "380" and their larger ones (36mm) "540". Both come in three different sizes, Small, Large and XLarge. These are copies of Hacker inrunners, "380" for the B40 size and "540" for the B50 size which makes it very easy to find an successful set-up to copy if you search the net. The ratios are the same for both Hacker and Feigao gearboxes 4.1:1 for "380" size and 6.7:1 for "540" size.</span></div>
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<span style="line-height: 115%;">But what does that 6.7:1 mean ? To get the kv of the prop shaft with a gearbox, simply divide the kv of the motor by the ratio of the gearbox. If we take the FG540-07S as an example, it's a 5070kv motor but using a gearbox with a ratio of 6.7:1 you get a kv of 5070/6.7 = 757. This would fit a 3S setup for a hotliner perfectly. If you want to use it to it's max amp rating (93A) check that your Lipos are up to it (Check C Rating in this Guide). Personally I go a little easier on the Feigao motor/gearbox combinations when copying a Hacker set-up, as Hacker are are a higher quality product.</span></div>
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<b><span style="color: #660000; font-family: inherit; line-height: 115%;">What Are Electronic Speed Controls (ESC’s)</span></b></div>
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<span style="line-height: 115%;"><span style="font-family: inherit; line-height: 115%;">There are two main types of ESC, for brushed or brushless motors. You cannot use a brushed ESC with a brushless motor or vice versa. Think of the features you will need like a brake and soft start. You will need a brake if you are using a folding prop and a soft start if you are using a gearbox and an on/off switch for a throttle. These features can often be found on Radio Controlled Sailplanes. The most important thing to consider when choosing an ESC is matching the ESC to your motor. It is good to use an ESC rated at a higher amperage than you intend running your motor at as an insurance against over stressing your ESC causing failure and potential damage to your model. Often you will see a burst rating for an ESC, meaning you can run the ESC at a maximum Amperage for a limited time, and exceeding this limit is asking for trouble. Most sensible aeromodelers like to have an esc capable of 10 to 20% more Amps than they plan to use depending on its quality. You will need a meter to measure the Amps and Volts being generated by your power system to ensure you are not stressing the battery, ESC or motor.</span></span></div>
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<span style="line-height: 115%;"><span style="font-family: inherit; line-height: 115%;">What is a bec? Bec is an acronym for battery eliminating circuit. This device provides power for the servos in your model. Many ESC’s have a bec that can only handle a certain number of servos at a given voltage. The higher the voltage you use the less servos you can use. Using too many servos from the bec in your ESC will cause overheating and failure of the bec. This will be catastrophic if your bec fails in flight so how can you safely run more servos with your ESC? External bec’s, or Ubec’s use power from your flight battery pack and are a cheap way of safely using more servos than the bec in your ESC can handle. A receiver battery pack is another way of supplying reliable power to your servos without using the bec in your esc.</span></span></div>
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<span style="color: #660000; font-family: inherit; line-height: 115%;"><b style="line-height: 115%;">Cut off voltage</b></span></div>
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<span style="line-height: 115%;"><span style="font-family: inherit; line-height: 115%;">Set the cut off voltage on your ESC to 3 volts per cell to ensure you don’t over discharge and damage your lipo pack.</span></span></div>
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<b><span style="color: #660000; font-family: inherit; line-height: 115%;">How To Choose the Prop?</span></b></div>
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<span style="line-height: 115%;"><span style="font-family: inherit; line-height: 115%;">The propeller is the component that puts a load on a power system. With the wrong prop you can damage your battery, ESC and motor. Think of the prop like the gears in a car. Some props are like first gear and the motor will have to work at high rpm to go slowly. If you have driven a 4X4 you will know that this gives you power to climb steep hills at low speed without stalling the engine. You could compare this to prop hanging a 3D model where power is more important than speed. On the other hand you might want to go fast. This will require a prop that is more like the top gear in a car. It doesn’t have the power to take off and climb a steep hill at low speed, but once up to speed it can maintain that speed comfortably. The numbers on a prop, say 10X4, give you the diameter and pitch. In this case you would have a prop with a diameter of 10 inches and a pitch of 4. A 10X4 prop will give you more thrust at a lower speed like the 4X4 analogy above. If you swapped it for a 10X7 prop you would have a higher top speed, but your take off run would be longer. The extra load on the motor would also draw a higher Amperage.</span></span></div>
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<span style="color: #660000; font-family: inherit; line-height: 115%;"><b style="line-height: 115%;">Pitch and Pitch Speed</b></span></div>
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<span style="line-height: 115%;"><span style="font-family: inherit; line-height: 115%;">Pitch is the distance (normally expressed in inches) that the propeller "cuts" through the air in a single rotation assuming no slippage. To achieve pitch, the propeller blades are angled to move air to create thrust. The angle of the blade determines its pitch. Propeller blades are aerofoils, just like the flying surfaces on our models. When they have a higher angle of attack they create more lift. In the case of propellers, a higher angle of attack (pitch) at a given rpm will create greater thrust.</span></span></div>
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<span style="font-family: inherit;"><span style="line-height: 115%;"><span style="line-height: 115%;">Pitch speed is the speed at which the propeller pulls through the air. It is calculated by looking at the pitch of the propeller, and the number of revolutions it performs in a unit of time. Pitch speed does not consider slippage, drag and other forces that may affect the aircraft.</span></span></span></div>
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<span style="line-height: 115%;">With a high wing loading you need a higher air speed to stay in the air. A higher pitch speed means lower thrust > longer take off > high landing speed. You can get both thrust and high air speed but it will be at a weight penalty as the power needed to get thrust for a short take off will not be in proportion to the power needed to stay airborne. </span></div>
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<span style="line-height: 115%;">Warbirds are an often examples of models with high power/high wingloading which are supposed to fly fast, and especially in glow to electric conversions you will need to take the wing loading into account. </span></div>
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<span style="line-height: 115%;">Hotliners and F5b models are one of the most extreme examples of high power/high wingloading. The more extreme examples have such a high pitch speed a catapult is needed to get them airborne because of the square (16x16) or over square (16x17) props they use in order to get extreme high speed/climbs. In a perfect world (with zero airframe drag and 100% prop efficiency) you can calculate the speed of your model from RPM x pitch)/1056 = your speed in mph. For example 10000rpm x 7" pitch /1056 =66mph or 105.6 km/h.</span></div>
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<span style="line-height: 115%;">Pitch speed isn’t only about wing loading it's also about what you want to do with your model, as I wrote above about hotliners and F5b. With an already light model or of moderate weight you can determine the behaviour from the choice of prop > pitch speed. Without the need of changing anything (keeping the same amps) you can take a GWS Formosa II with a 10x5 from being a sporty low wing aerobatic trainer to a fast aerobatic plane with a 9x6. As a general rule 1" pitch relates to 1" of diameter, if you step up 1" in pitch you need to step down 1" in diameter to keep the same amp draw.</span></div>
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<span style="line-height: 115%;">With more normal kind of planes we usually use a prop with the proportion of 1:2 i.e. 10x5, 11x5.5, 12x6 and so on as it is most effective (from what I heard). A High wing trainer could very well use a more square prop like 9x7 instead of 11x5.5, it'll still have a high lift and once airborne you can throttle down, the higher pitch will give it airspeed and you'll get long flying times with low amps, perfect for photography or video.</span></div>
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<span style="line-height: 115%;">The following is some extra information about prop selection kindly offered by brucea from RC Groups. </span><i><span style="line-height: 115%;">“As a rule of thumb, you want to have a static pitch speed within the 2.5 to 3 times the stall speed. So if your plane stalls at 15 mph in level flight you would like a static pitch speed between 37.5 to 45 mph. </span><span style="line-height: 115%;">For a particular motor, I know from testing that with a 12x6" propeller the motor is running at 7165 RPM. Each revolution pulls the plane forward 6". So my plane would be making 6" x 7165 RPM or 42,990 inches per minute. Dividing by 12" gives me 3,582.5 feet per minute. Multiplying my 60 minutes gives me 214,950 feet per hour. Dividing by 5280 feet gives me 40.7 miles per hour. The plane I has a calculated stall speed of 14 mph. 40.7 divided by 14 equals 2.9. This ratio falls within the desired 2.5 to 3 ratio of pitch speed to stall speed, which is good! </span></i></div>
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<span style="line-height: 115%;">To select a motor you may have to work back-wards from prop diameter. The plane I have can take a 12" prop. I like to get the largest diameter prop that will fit.”</span></div>
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<b><span style="color: #660000; font-family: inherit; line-height: 115%;">LiPo packs</span></b></div>
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<span style="font-family: inherit; line-height: 115%;"><b style="color: #660000; line-height: 115%;">Safety</b><span style="line-height: 115%;"><span style="color: #660000;">: </span>Always use your lipo packs safely.</span></span></div>
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<span style="color: #660000; font-family: inherit; line-height: 115%;"><b style="line-height: 115%;">C rating</b></span></div>
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<span style="font-family: inherit;"><span style="line-height: 115%;"><span style="line-height: 115%;">Broadly speaking, the "C" rating is a guide to how much current it is safe to draw from your battery. It's expressed in terms of the capacity or C. Beware that constant discharging of your lipo pack at its maximum C rating will almost definitely shorten its life. Depending on the quality of your pack, it is much wiser to keep your current draw to about 10 C with short bursts up to 20 C if you want your pack to last. The easier you are on your pack the longer it will last.</span></span></span></div>
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<span style="line-height: 115%;">A 2200mAh 10C battery is rated to be discharge at up to 22A (10 x 2200mA/1000) and the same size 12C battery would be good for 26.4A (12 x 2200mA/1000). </span><span style="line-height: 115%;">The internal resistance in higher C rated packs is lower, meaning that the voltage drop found in higher C packs is not as pronounced giving higher voltage under load and slightly more power. </span><span style="line-height: 115%;">Here is Brucea’s experience testing two 2100mAh 11.1V lipoly packs which demonstrates higher voltage of a higher C pack under load. </span><span style="line-height: 115%;">“I tested a 20C versus 15C 2100mAh 11.1V lipoly batteries. Motor volts and thrust are as follows:</span></div>
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<span style="line-height: 115%;">15C: 9.3 V motor voltage, 44.6 oz of thrust producing 271 Watts</span></div>
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<span style="line-height: 115%;">20C: 10.1 V motor voltage, 48.9 oz of thrust producing 318 Watts </span></div>
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<span style="line-height: 115%;">The motor draws 29 Amps from the 15C 30Amp discharge battery, and 31.5 Amps from the 20C 40 Amp battery. For this motor I am using two 2100 mAh 11.1v 15C batteries in parallel. This gives me twice the "C" rating or 60 Amps. This particular motor pulls 31 Amps with a 12x 6" prop and two 11.1V 15C 2100 mAh batteries.”</span></div>
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<span style="line-height: 115%;">Also beware that lipo manufacturers often put an overly optimistic C rating on their packs. Unless you see independent test results you trust for lipo packs, use them at about half the stated C rating and you should get many more cycles from them.</span></div>
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<span style="color: #660000; font-family: inherit; line-height: 115%;"><b style="line-height: 115%;">mAh</b></span></div>
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<span style="line-height: 115%;"><span style="font-family: inherit; line-height: 115%;">mAh is an acronym for Milliamp Hour, which is how much current a battery will discharge over a period of one hour. Higher numbers here reflect a long battery runtime and or higher storage capacity. For example a 2000 mAh pack will sustain a 2000 milliamp (2 amp) draw for one hour before dropping to a voltage level that is considered discharged. A 1700 will sustain a 1700 mAh (1.7 amp) draw for one hour. 1000 mAh is equal to a 1 Amp Hour (AH) rating.</span></span><br />
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<span style="line-height: 115%;"><span style="font-family: inherit; line-height: 115%;">Like the C rating, the mAh rating also determines the maximum current that can be drawn from a pack as can bee seen in the calculation in the C Rating section above. For example if you have three 11.1 Volt 10C packs, one rated at 1000 mAh, one rated at 1700 mAh and the other at 2000 mAh, we can determine that it is safe to draw the following amperage from these packs. Multiply the C rating by the mAh rating and divide by 1000 to convert milliamps to Amps:</span></span></div>
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<span style="font-family: inherit; line-height: 115%;"> <b>Credits: </b>Information from the public domain and other hobbyists. You too can contribute, please post your comments and/or send me an email.</span></div>
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<span style="font-family: inherit;"><span style="line-height: 115%;">************************************************************************************************************************</span><span style="line-height: 115%;">*</span><span style="line-height: 115%;">*</span></span></div>
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