תראו שירשור מעניין שנתקלתי בן ב RCG דאון מדהים והוא צופה תוצאות מטורפות:

Power system
As far as prop and battery goes I've ordered the components. I'll be using a 5S 2500mAh battery for a total of 46Wh. This plane requires less than 30W for level flight in dead air, so I'm good for 90mins of flight in "worst" case. Full throttle will pull about 55A, or almost 1kW (according to MotoCalc). Prop will be 18x11. I won't be allowed to max out for long, but won't really need to. Climb speed will be around 16m/s

http://www.rcgroups.com/forums/showthread.php?t=1176673