Would a single with no dampers put the resonance
beyond
the useful range?
Good
question Ernest. I thought about trying the RD-1C drive with a
solid plug where the rubber dampeners normally live, but when I considered
that all the normal gear lash play would still be there, I realized
it was probably not going to be much of a test.
How much gear lash is there on a
typical Hirth, or Rotax gear box?
Cheers,
Rusty
There are two issues to cope with, one is resonances
and the other is transferring the torque pulses. The torque pulses are
transferred completely in a indefinitly stiff system. We do not want that,
because of the internal forces involved. That leaves the resonances
created by coupling and element flexing properties. I believe the only way
to stay out of the resonances is to keep them low. This is what ROTAX is
doing, a 582 has gear rattling around idle. When you watch a ROTAX
starting up it is very obvious when the rattling occurs. I have not
observed any rattle on my C-Box with the SOOB.
My ROTAX C box has about 1/8" gear lash at the
tip of th 72" prop. I have seen the same on others, seems to be
normal.
Richard Sohn
N-2071U
Richard,
Do you have a photo of that donut type damper
- is it similar to the BMW type?
Have a look on the internet for Lord Dynaflex
Couplings, that's what Don Dunbar is using and sounds like it is ideal for
the single rotor, I prefer Tracy's set-up for the 2 rotor.
George ( down under)
George,