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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.

33 How about fixed-pitch versus collective helis? (RC flying - Helicopters)

Helicopters with collective are now inexpensive and reliable. Every
reasonable modern heli, from beginner-trainers up to FAI world-beaters, has
collective. In a fixed-pitch heli, lift is controlled by varying engine
RPM, just as in an airplane. This is an outmoded technology, and you will
outgrow such a heli very soon. Virtually no aerobatics, no auto-rotation
(if the engine quits at altitude, the heli becomes a brick), not as much
fun.

 

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