Gaz Reed Posted August 16, 2012 Share Posted August 16, 2012 I have very little if no knowlege on elecs.So working out cell count for a said kit is beyond me. I have aquired from a friend 6 packs of good 5s 4200 packs because he no longer as a use for them. I have a trainer at the moment which uses 3s packs so its no go for that. I am building at the moment a Flair puppeteer Bi-plane which i intended to run IC with.I am now thinking of going electric with these cells.But i have no idea what the proper cell count should be.I am open to the motor and esc to suit the 5s packs.The weight of the kit is stated at 8lb/3.6kg.I could get a slightly smaller kit at 6lb/2.7kg if that is more suited to 5s packs. Any advice would be great. Quote Link to comment Share on other sites More sharing options...
pete taylor Posted August 16, 2012 Share Posted August 16, 2012 Gaz, if you pm me I'll give you my phone number and talk you through it - it's fairly simple and very starightforward really! Cheers, Pete Edited By pete taylor on 16/08/2012 14:32:55 Quote Link to comment Share on other sites More sharing options...
Mark Powell 2 Posted August 16, 2012 Share Posted August 16, 2012 You decide the power needed to fly the plane. A good starting point is 100 watts per pound of aircraft. Number of cells does not really matter. For example a six cell pack at 24 volts and 20 amps is the same as a three cell pack at 40 amps. So you choose a motor with an output power of sufficient watts maximum to fly the plane (look up the motor specs). Then you look at the RPM/volt figure. If you want to use a six cell pack you would look for a motor with half the rpm/volt that you would use if you had a three cell pack. You also have to look at the recommend props. You would not want a 6x5 prop on a Puppeteer. It looks complicated because it is. I have been doing it for years. didn't stop me scrwwing up a moter choice a couple of weeks ago Quote Link to comment Share on other sites More sharing options...
Pete B Posted August 16, 2012 Share Posted August 16, 2012 My Carl Goldberg Cub weighs in at 7lb 4oz and flies very nicely on an XYH C4250 700Kv motor with a 12 x 8 prop, producing around 750W@40A on a 5S pack. I reckon 5S is about the right size pack for the Puppeteer. Motor-wise, anything around the 700Kv mark would be OK. Mine is no longer available but I'd be looking at this motor or this one as suitable replacements, with a 60A ESC. I'd say they would be ideal for the Puppeteer. Pete Quote Link to comment Share on other sites More sharing options...
FunnyFlyer Posted August 16, 2012 Share Posted August 16, 2012 Posted by Mark Powell 2 on 16/08/2012 14:41:53: You decide the power needed to fly the plane. A good starting point is 100 watts per pound of aircraft. Number of cells does not really matter. For example a six cell pack at 24 volts and 20 amps is the same as a three cell pack at 40 amps. Re number of cells not really mattering... It does start to have impact with high power systems. A larger cell count gives a higher voltage, which means that for a given Power (Watts) you can use less current. Keeps ESC ratings sensible and give good duration. Quote Link to comment Share on other sites More sharing options...
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