Shaun Marshall Posted December 8, 2012 Share Posted December 8, 2012 hi after some help again as struggling with an electric converison. ive built a plan called tb-I 39" span for 1.49-2.49cc engine but i want to electrify it wieghs 1.5ILb on the scale with lipo fitted what kind of motor should i be looking at for it any advice greatly appreciated Quote Link to comment Share on other sites More sharing options...
GrahamC Posted December 8, 2012 Share Posted December 8, 2012 Why not pop up a picture in order to give us an idea of the kind of model it is, and the kind of space that you have for the motor. I couldn't find a picture with Google! Should be lots of fairly economic choices for motors. Quote Link to comment Share on other sites More sharing options...
Steve Hargreaves - Moderator Posted December 8, 2012 Share Posted December 8, 2012 As Graham sez a picture or a description of the aircraft helps determine the sort of flight characteristics the model is likely to have. This can have a bearing on the type of motor/prop you might need...... Going purely off the weight then the usual rule of thumb is 100watts/lb so 150watts or so would probably fly it very nicely......this is only a rule of thumb.....if its vintage 70-80watts/lb will be plenty....is its an aerobatic or 3D type then you might look towards 150/200 watts/lb Quote Link to comment Share on other sites More sharing options...
PatMc Posted December 8, 2012 Share Posted December 8, 2012 I think the model was a free plan in the Radio Modeler around 1990 but I don't remember what format it took. However the engine range given for that era would have equated to about 110W - 150W. If the model is already built the best bet would be to see how much weight is needed in the nose to achieve the cg & look for a motor of about that weight. The next consideration would be the prop size. The original would probably have had a 7" or 8" prop which with the battery voltage would determine the required motor's KV. Quote Link to comment Share on other sites More sharing options...
Trevor Crook Posted December 8, 2012 Share Posted December 8, 2012 Shaun All the advice above is good. In case you need more of a steer, I'd suggest a motor of around 1000 - 1300kV, a 1300 3s lipo, and a 7x4 or 8x4 prop, which will put you in the 150W ballpark. If you haven't got a wattmeter, it's well worth investing in one for tuning in the power you need, without stressing the power train. The above setup will draw around 15A so an 18-20A ESC should be OK. As has been said above, choose a bigger battery if you have the room and need the weight. Quote Link to comment Share on other sites More sharing options...
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