X-Mozilla-Keys:                                                                                 
Marc Pedings wrote:

Bill Freeman wrote:

If HV chain is rated at 4-6X the silent chain, it may be a real
serious competitor to the planetary drive, altho the shaft offset
and load assymetry are still issues, certainly not unsolvable.

I am going to go out to see what Morse has on the web.

Bill

I have had an extensive conversation with Morse and have re-affirmed my
supporting data for the HV drives.  I have noted in this conversation
that Hy-Vo is loosely associated with Silent Chain.  Although it is
'similar' to a Silent Chain, there are some differences in the two.
First is the sprocket tooth profile.  The profile in the HV is different
in such that it has a higher profile than the typical Silent.  The chain
has the same rocker and pin joint.  In the HV, the pull line of the
sprocket to chain lies higher in the chain crotch.  This greatly reduces
the chain's tendency to 'jump away' from the sprocket.  The HV chain has
a unique involute profile that is "supposed" to reduce stress and chain
to sprocket impact.  This is how they are able to increase the ratings
versus the typical silent chain

Before anyone calls Morse, I have taken the liberty and discussed two
'marine drive' scenarios.  I will have the application data later this
afternoon and make it available to everyone.  To wet your appetite for
now:  A 930HP at 10,000 rpm with a service factor of 1.5 has a fatigue
life of 5 minutes.  Reduce that RPM to 9000 and to a 1.2 service, you
increased the life of the chain to 20 hours!  The above was for a 1/2
inch pitch and a 3" wide chain.  Reno anyone? ;-)

Marc Pedings

Marc, I am working on a drawing of this PSRU. About what does that chain
weigh
per inch or per foot?

Paul Lamar
 
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