Bradley Darville wrote:



--- Bradley Darville
--- ellivradb@earthlink.net
--- EarthLink: It's your Internet.
Dear Mr. Lamar.
I have read about the tortional vibrations produced by rotaries. I was wondering what your thoughts are on the use of a morse Hy Vo chain  type p.s.r.u. ? I understand that this type of chain is very good at dampening vibrations, and I know they are extremely reliable in other applications. I am also fascinated by 60 degree V6's for various reasons.. anyway, I stumbled across one that I found very interesting. This one is used on a yamaha outboard motor. It is very compact, 4 valve, injected, with the exhaust ports on the inside of the "V". They claim 225 H.P. from this gem of a four stroke, 60 degree V6. If yamaha builds an Inboard version of this engine, It may make a beautiful conversion. I have experience with some of yamahas recent motorcycle engines and I find the design and execution of these machines to be awe inspiring , and would not be surprised to find the same to be true of their marine products. Im telling all this to you because my wife no longer lets me talk about engines around the house...thanks for your time. Sincerely, Brad.

___________________________________________________________________________________

Actually the torsional vibrations of a rotary are less severe than a four cylinder
piston engine.

The lightest psru's and the ones that fits airplanes the best are made
from planetary gear sets.

A rotary is totally unlike any piston engine. There are not a zillion little
parts rubbing together and jerking back and fourth to wear out. It is also 
far more robust structurally speaking and never fails in the hand grenade 
mode like a piston engine.

There is absolutely no comparison.

Paul Lamar
 
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