One quick fix is adding a bit of flywheel mass. The race car can idle right
down, RPM wise but with no flywheel, it shakes the trans so hard you hear it
above the considerable exhaust note. So, the idle is set at 2,200 RPM. Seems
real happy there and makes no trans noise.
The missing rotor looked like flywheel mass to the system. So removing it
raises the RPM where one of the nodes is peaking.
The BD-5 article is a must read for all builders, just to get the hair on
the back of your neck standing up.
Bill and
Lynn,
Thanks for the
pointer to the article. Indeed, it's interesting, and gets your
attention.
I had wondered if
a flywheel of sorts would be needed, but with the high weight of the engine now,
I'd hate to add more weight. It would make an interesting test, if I could
do it easily though. Perhaps some evenly matched weights could be added at
the 4 bolts that hold the flex plate to the drive plate. I'm not sure if
you could put enough weight there to really matter
though.
This will make a
really interesting project, and perhaps another good use for
the dynamic balancing equipment. It's all going to have to wait until
the RV-8 is flying though, because that's my only priority at the moment.
My goal is to have it flying by the end of the Summer, so maybe I can get back
to the single rotor project then.
Cheers,
Rusty
PS- Tracy, can
you send me the dimensions and durometer specs for those
dampeners?