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Hey, Bill, I think it would be great if a light weight
relatively inexpensive way could be found of providing the required hydraulic
pressure and speed control (adapting a lycoming governor is one way). It
wouldn't hurt my heavy RV-6A getting up quickly out of short grass strips
either.
I think had there been a large demand for Tracy's gear box to
have the provisions for it, it probably would have been incorporated in the
design - but the old chicken and egg situation.
Perhaps the one that Lou referred to may be the answer as its
hydraulic control is apparently internal to the prop hub - if I understood
correctly. Wonder how much it weighs?
Ed
----- Original Message -----
Sent: Wednesday, December 20, 2006 12:19
AM
Subject: [FlyRotary] Re: hydraulic
constant speed prop for rotarys
Guess I did, Bill. I know the governor has the
pump to do this, its just I've not found a governor suitable for a rotary
engine.
OK Ed,
I kind of figured you understood about the pump in the governor. As to
the speed, I figured that the governor would require a reduction identical (or
really close) to the PSRU. This could be a toothed belt/pulley system. With
the reduction any standard governor would work. Mistral uses a helical right
angle drive to a pad on the side of the prop shaft. I've also seen a v-belt
driving off a pulley at the front similar to the O-360 Lyc alternator drive.
Some movement is OK it needn't be timed. The reason I'm interested is the
RV-10 will probably benefit from a CS.
As you mentioned the RV-4 hardly needs a CS. Just more
complication. I am supprised Tracy didn't think about the other planes that
would or could be using the drive when going into production though.
Bill Jepson
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