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Richard Sohn wrote:
Hi Rusty,
let me throw something in here on the dampener. Tracy's dampener
is not built to take up a lot of torque vibration at low rpm. What
we need on the single is having the soft elements closer to the
center line of the e-shaft, allowing more movement in them, eg.
having a softer coupling = lower resonant frequency, and at the
same time utilizing some of the dampening characteristics
inherrent in the rubber. The closest to that requrement I could
come up with, is the do-nut shaped coupler used on Rotax and Hirth
engines. They are also available in different Shore values. I have
not found a US source yet.
I have not demonstrated yet if this solution is sufficient, but
analysis indicates that, if the idle speed is 1500rpm or above, it
should be ok.
All this does not eliminate the careful selction of a sufficient
fly wheel.
Richard Sohn
N-2071U
There are two ways to avoid resonance. Drive out all the play in the system, putting the resonant frequency above the operating range, or add a lot of play, putting resonance below idle. The Powersport guys tried the former, driving the redrive cost beyond resonable. But that was with a two rotor. Would a single with no dampers put the resonance beyond the useful range?
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,|"|"|, Ernest Christley |
----===<{{(oQo)}}>===---- Dyke Delta Builder |
o| d |o www.ernest.isa-geek.org |
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