does 2 x 0.20 engines equal a 0.40 ?
donehead:
Generally speaking, two 20 engines will not have any more power than one 40. But. What power they do develop will be applied more efficiently, because they will usually have greater propellor disc area.
All other things being equal, a pair of 20's will give about the same effective power as a 50 or 52 engine.
Bill.