Subject: Hollow Prop Shaft Gearbox
From: Rotary Engine
Date: 10/7/2009, 6:42 AM
To: AAA Put this in the To box

Matt wrote:

Chris,

Everyone keeps asking us if we have something for the
Subaru so Bud built one for my plane out of billet aluminum.  It
has no offset and is a 4 gear setup with the same features as
the one we build for the LS-1.  It has a centrifugal clutch,
independent oil system, pressure oiled tapered and straight
roller bearings and straight cut spur gears, mount for a prop
governor and a hollow prop flange like a Lycoming.  It supports
any reasonable prop you would want to put on it.  The unit is
designed for the 200HP and lower crowd but keep in mind that a
gear box does a torque multiplication so a 150 HP engine can
pull as hard as a 200+ Lycoming.

The weight for my unit is
about 3 lbs lighter than the Eggenfellner package we took off.
We are just now doing surveys to see if there is a market for a
gear box with these features.

Production costs have not been
worked out completely yet so we are checking to see if there is
any interest at a price point of $5900.00 We ran the first box
on a 350 chevy for 40 hours with a 72 inch McCaulley prop at
full coarse pitch.  Tore the unit down after 40 hours and there
was no wear apparent.

Ground run temps on the gear box were
well under 200 degrees.  I now have about 50 hours flying time
on it and it has improved my RV-9 about 10-15 MPH with a 200hp
Mooney prop (WAY too much prop for my plane but what was
available).

It is a kick in the pants when you take off and the
prop governor starts to pitch the prop and your speed jumps.  I
take off with about 5 rounds in on the prop control and hang on.
Since the P2 uses off the shelf straight cut spur gears, ratio
options are many.  I am using about 2.1 to 1.  Changing ratios
takes about 2 hours.

If you are stuck with only electric props
as an option for your subie, we can help you get into the
hydraulic prop arena.  The savings on a prop might offset the
higher gear box cost.  Hope this answers some of your questions.
If not, feel free to contact me any time.  My cell is
281-222-6361 or come by my hanger in Conroe Texas (CXO) any time
and see what the crazy guys are up to.

Regards Larry Perryman

What does it weigh?

Paul Lamar


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