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View Full Version : Light Helicopters and Tail Rotor Rolling Couple


India Four Two
29th May 2012, 05:47
On an AH&N thread,Tiger mate described the tail rotor rolling couple:

http://www.pprune.org/aviation-history-nostalgia/485933-any-borneo-whirlwind-veterans-here.html#post7210919

This is something I hadn't heard of before and did some research on the subject, including looking at a three-view of the only helicopter I have flown - a Bell 47.

Some of the information I saw indicated that the ideal tail rotor position for avoiding a rolling couple, is level with the rotor head. However, all of the light helicopters that I looked at, including the Bell 47, have the tail rotor significantly below the rotor head.

How is the rolling couple handled in these light helicopters?

I42

dusk2dawn
30th May 2012, 09:39
Trim!
And if you use the Rotorheads - PPRuNe Forums (http://www.pprune.org/rotorheads-23/) section you'll probably get some links to illustrative graphics.

India Four Two
30th May 2012, 16:00
d2d,
Thanks. I've taken your advice. Waiting for links and education. ;)