Paul and everybody, thanks for continuing to patiently educate me in these
 topics.  I might be interested in participating in a group buy of the new
 damper, but should we be concerned that the Kawasaki KE 175 was only 17
 horsepower?  Also, could this damper's location at the rear hub possibly
 indicate that its purpose was only partly to dampen engine pulses but more
 to dampen driveline lash when the clutch is engaged, or when
 shifting?...hence its location downstream from most of the drive- line.  I
 used to ride a lot, and sometimes just by engaging first gear [even with
the
 clutch disengaged] this caused the final drive chain to jump and slightly
 jerk the bike [noticed this is Yamaha RD 250, Honda 750, but not so much
in
 my shaft drive BMWs...] Paul could address such issues from the durometer
 value.


 I was reading in the attached Centa catalog on page 5, para 6, that
 "For other applications and for generators whose mass moment of inertia
 is outside the stated limits, we request that full details of the
 proposed
 drives are sent to us.  We can then carry out a torsional vibration
 calculation free of charge."

 If I am way off base, then please ignore!

 Gene Kahn


Good luck with them. We are not big enough to interest them.   We tried a
different type on a rotary and they were usually limited in an RPM range to
a number below what we run at.  The type we tried were too stiff.


Some of
the parts in this catalog are cast iron.  4130 has much higher strength the
weight ratio.  These are not cheap as well.

 Paul Lamar

 --

    Hi, these are worth taking a look at;
http://www.sgf.de/uppics/Datenblaetter_Industrie_englis.pdf    They are
used on auto drive shafts and Porsche used one on their aircraft engine.
They are cord reinforced rubber like a tire, most others are just rubber
and have lower speed limits.

Murry

Promising. The  GA000-012 or -029 might work. Interesting and very simple concept.  Ideal size at around 6.3" OD. 10,700 RPM

Good work Murry.

Paul Lamar