bert baker Posted August 9, 2019 Share Posted August 9, 2019 Good morning all,, My son has built a Extra 330 from a kit he purchased from Bangood,1 meter wing span the recommended motor is 900-1200kv, he fitted a 1000 Kv and 30amp speed controller and a 3s 2200, He test flew it but was low on power, and says close to tip stall Has any one built or flown one Does anyone know what power setups he should be using Edited By bert baker on 09/08/2019 10:13:37 Quote Link to comment Share on other sites More sharing options...
Alan Gorham_ Posted August 9, 2019 Share Posted August 9, 2019 There's not much detail in the numbers you have provided to enable anyone to advise. What prop size is fitted? What is the current draw at full throttle? What is the maximum rated current of the motor you have fitted? What is the AUW of the model? Quote Link to comment Share on other sites More sharing options...
Bob Cotsford Posted August 9, 2019 Share Posted August 9, 2019 My similar sized Sukhoi from Hobbyking has a 3548 900kv iirc motor and 60A esc, I can't remember what size prop but the log tells me it pulled around 500W on a 3S 3000 pack. Edited By Bob Cotsford on 09/08/2019 13:08:59 Quote Link to comment Share on other sites More sharing options...
bert baker Posted August 9, 2019 Author Share Posted August 9, 2019 Ok spoke to my lad 10/7 electric prop 22amp at full power 21 amp max on motor booklet weigjt unknown at moment Quote Link to comment Share on other sites More sharing options...
Alan Gorham_ Posted August 9, 2019 Share Posted August 9, 2019 So if it weighs any more than 2lb 6oz it will have less than 100W/lb power loading and won't fly like an Extra. You are already at (past actually) the motors max current rating so you can't fit a bigger prop to increase current draw and hence power. You could try going to 4s and propping down to keep your full throttle current around 20A, or stay on 3s and fit a bigger motor and ESC, but to make a good choice of motor you need to know the AUW. Quote Link to comment Share on other sites More sharing options...
Bob Cotsford Posted August 9, 2019 Share Posted August 9, 2019 The advertised flying weight is 800gm and your setup is giving around 230W so if you have achieved the optimistic sound 2lb rtf weight your 110-120w/lb should give a reasonable performance. Quote Link to comment Share on other sites More sharing options...
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