George

Do you have the engineering data on the similar damper that Don Dunbar

is

using?

Paul Lamar

Paul,
Yes have that! and have spoken to Don, he in turn has spoken to the
manufacturer.
Don feels it's OK but it's not rated with high enough RPM in the
literature - Don checked with the manufacturer and they said they felt

it

was fine, only they hadn't tested beyond that particular rating.
George (down under)

Send one to me and I will see if it blows up at 7000 RPM :)

To characterize this device you usually measure the torsional stiffness
in foot pounds required to twist it one degree. Maybe Don could bring one
when he comes over and Brian could send it to me from Seattle.
I'll then compare it to Tracy's and see if it is in the same ball park.

Paul Lamar

Paul,

That's not a bad idea at all, I haven't got one to hand but will get a
couple and send you one for independent testing.

Personally I would like to see it tested to 8,000 or 9,000 RPM for a
prolonged period, in a rig that's not particularly perfect in alignment etc.
Can you get beyond 7,000, if not that will have to do.
George (down under)

Before you send it mount it on some sort of shaft and bearings so I can drive it with
a V belt pulley. In fact install a 4 inch V belt pulley. Standard shaft diameters
in the U.S. are 5/8th of an inch.

Paul Lamar


 
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