John Laverick Posted December 5, 2012 Share Posted December 5, 2012 Been re-egineering an old Mick Reeves 88in Hurricane to electric and found to my cost as the plane gets bigger and heavier the electrics require to be upgraded. I was getting 890watts per lb, which for a 13 lb model doesn't quite cut it!! Right I thought, bigger motor, bigger prop is the order of the day. I had a 100amp esc on it already, so no probs I thought. She ran sweet on 8s only pulling 42 amps with my new motor but it needed more ooomph, stuck 10s on it and then poof!!!!!! that lovely sickly sweet smell of an esc frying. On inspection I couldn't believe how dumb I'd been? Yea it was rated for 100amps but only 2-6 lipos!!! didn't even realize I need a higher voltage ESC. Then I looked at the UBEC and that was only rated for 2-6 lipo's as well! Numpty Quote Link to comment Share on other sites More sharing options...
FlyinBrian Posted December 5, 2012 Share Posted December 5, 2012 I would have thought 890 Watts per pound would be enough for anyone! Quote Link to comment Share on other sites More sharing options...
John Laverick Posted December 5, 2012 Author Share Posted December 5, 2012 Do you think so Brian? I've enquired about this before on the forum and the consensus of opinion seemed to be that you need over 1000w per lb for a warbird! Quote Link to comment Share on other sites More sharing options...
Eck Posted December 5, 2012 Share Posted December 5, 2012 Shouldn't that be 100 watts per pound, maybe 120 for a warbird? Quote Link to comment Share on other sites More sharing options...
John Laverick Posted December 5, 2012 Author Share Posted December 5, 2012 Doh! 89 watts and 100 watts per lb. 1000w would get a full size one up!! Quote Link to comment Share on other sites More sharing options...
Olly P Posted December 5, 2012 Share Posted December 5, 2012 I think John is confused... 890 watts total in a 13lb model is 68.4 W/lb. Not much! I'd suggest John actually needs 1300-1560W total to fly this Warbird - almost twice what he has available! Quote Link to comment Share on other sites More sharing options...
Olly P Posted December 5, 2012 Share Posted December 5, 2012 Ahhh....darn those stray 0's!!! Quote Link to comment Share on other sites More sharing options...
John Laverick Posted December 5, 2012 Author Share Posted December 5, 2012 Getting everything mixed up Olly, the model actually weighs 11 lbs 2 oz and it pulled 890 watts. so what's that about 80 watts per lb? I've seen an example set up of 20 x 10 xoar wooden prop, 10s 3000mah pulling 1600w @ 47 amps. which is exactly the same set up I'm going for when I get my new (and considerably more expensive) HV ESC!! Quote Link to comment Share on other sites More sharing options...
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