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Old 07-09-2009, 12:43 AM   #32 (permalink)
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Guys/girls, remember a truely round loop has +4g at the bottom, entry, +2g in the vertical and +1g over the top, with the same on the downward side, ie +2g, then +4g on exit. So there is no need to have negative over the top, look at your collective position the next time you do a perfectly round loop, you might end up with zero stick/pitch position, but the relative airflow due to forward speed still gives the heli positive angle of attack on the blades to hold the +1g over the top.

So for full scale helis to do a loop is theoretically possible on all helis, but head design, ie rigid or not, power to weight ratio etc plays a more important part in the aerobatic capability of full scale helis.
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