Originally Posted by
chopjock
Arnie,
We use the offset pitch link system on model helicopters. It adds in negative feedback to the blade during gusty conditions. Imagine advancing blade flaps up but the pushrod from the swash plate holds the grip where it is, the result is the blade introduces momentary less pitch during the flapping (up) event and automatically twists the blade back down again at the same time. This happens for both teetering and flapping events when the pitch link is offset in this manner.
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Thank you
Frank also incorporates some Delta-3 angle in the main rotor.
Now I wonder if that offset pitch location is how he accomplishes it
Of course 2 blade tail rotors have Delta-3 to retain the plane of rotation and prevent flapping into the boom
but as far as I know he is the only one who does it on the main rotor as well.
Through the years my suspicious mind has pondered whether his
unique Delta-3 combined with his
unique coning hinges can create an unknown gremlin in certain conditions
I have often wished some researcher would mount the R system on a test stand and put it through every conceivable
motion to see if the blades would divert from their proper plane of rotation (not including Zero-G of course)
It would not require a lot of funding and if they used measuring instruments on all 3 hinge points could determine
if the coning hinges sometimes pivot beyond the design intentions.