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Forum: Rotorheads

23rd Apr 2021, 13:05

Replies: 21

whats the technical cause of the massive two-per vibrations of an airworthy Huey

Views: 6,494

Posted By Reely340

SWEET! That is a very amazing revelation! That...

SWEET!
That is a very amazing revelation! That description sounds like the condition of "bouncing rotorshaft" should be avoided at all cost, because it stresses everything, from MR bearings to pitch...

Forum: Rotorheads

23rd Apr 2021, 12:55

Replies: 21

whats the technical cause of the massive two-per vibrations of an airworthy Huey

Views: 6,494

Posted By Reely340

You mean asymmertical negative pitch at full down...

You mean asymmertical negative pitch at full down collective?
Well I can see how the rigid head of a BO would translate uneven lift into mast torque and vibration,
but a teethering head would...

Forum: Rotorheads

23rd Apr 2021, 12:52

Replies: 21

whats the technical cause of the massive two-per vibrations of an airworthy Huey

Views: 6,494

Posted By Reely340

Tune? It should be balanced right. If something...

Tune? It should be balanced right. If something is balanced it is so at 100 rpms as well as 400, not?
Considering that the centrifugal force increases proportional to rotational speed squared...

Forum: Rotorheads

21st Apr 2021, 15:32

Replies: 21

whats the technical cause of the massive two-per vibrations of an airworthy Huey

Views: 6,494

Posted By Reely340

Pheewh, that was close. I was astonished to hear...

Pheewh, that was close. I was astonished to hear that explanation (because I'd figure at 100% and max. torque the downwash in a (near vibrationless) hover at the tail boom would be much stronger, but...

Forum: Rotorheads

21st Apr 2021, 00:36

Replies: 21

whats the technical cause of the massive two-per vibrations of an airworthy Huey

Views: 6,494

Posted By Reely340

Thx for the detailed reply, but those...

Thx for the detailed reply, but those "vibrations" occurred way before translational lift, even before hovering, they were pratically still on the ground when everything was rocking wildly. So no...

Forum: Rotorheads

20th Apr 2021, 16:07

Replies: 21

whats the technical cause of the massive two-per vibrations of an airworthy Huey

Views: 6,494

Posted By Reely340

whats the technical cause of the massive two-per vibrations of an airworthy Huey

There is a nice vid about the Huey the Nelson-D'Anona foundation is operating. https://www.youtube.com/watch?v=zunO6iUVUT0
And I noticed the two per revolution they are famous for, while bringing...

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