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Message
Greetings,
I shot some
more video today, of the original shore 60 damper, and then of the new shore 50
damper. The 50 was noticeably better, particularly in that it completely
eliminates a severe resonance that was happening at 2700 rpm. With the 60
shore, at 2700, there was a very audible "rattle", and the air filter shook so
hard it was a blur. My guess is that the shore 50 moved it from 2700
to somewhere below the 2500 I'm using as a minimum.
I'm sort of
dazed from looking at video, but the prop flex is certainly not gone. It's
a bit cleaner with the 50 shore, but not by a huge amount. The worst flex
is between 2500 and 3000 rpm, and that's also the point where
the trailer rocks from the force of the prop. It's quite likely
that's at least contributing to the problem, but there's no denying that
the torque direction, and prop flex direction are coupled
together.
I can already
think of lots more tests, but the 50 shore damper stays, and I wish they made a
softer one. I also think anything over 3000 rpm is not a problem, and
this might be a limitation that could be lived with. I've got about 16
hours of driving in the next few days, so I'll have plenty of time to think
of what to do next.
Rusty (a bit
more optimistic today)
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