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This article is from the Radio Control (R/C) Flying FAQ, by Shamim Mohamed shamim@math.isu.edu with numerous contributions by others.

14 I didn't know that you could put an electric motor and batteries in an airplane. Isn't that kind of heavy? (RC flying - Electric Flight)

Modern NiCd batteries are pretty amazing. You can charge them in 15
minutes, take power out of them at up to 50 amps or so, and do it all day.
That capability is what makes electric flight possible. Electric power can
be used for any kind of flying---gliders, aerobatics, even racing. It's an
excellent choice for sport flying.

 

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sports, radio control flying, glider, sailplan, power, electric flight, helicopter