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
 --
This is the kind of coupler I am using on the single rotor. I never saw a
problem with it so far. Since this coupler came with the redrive, I do not
have an independent source for it.
One thing I like to point out for using this type of coupler, it is very
important for the input and output forkes to be very precisely centered with
each other. Insufficient centering will lead to immediate destruction at
elevated power levels. I have seen that on automotive engine dynos quite a
bit.
FWIW

Richard Sohn
N2071U
www.fairpoint.net/~res12/home.html

What idle speed do you use Richard?

Paul Lamar