Paul,


I noticed the Reno Racer drawings on the ACRE website listed the Bell final
drive as having 3.1:1 ratio. Perfect.

I am trying to contact the different sources you provided to get an price on
them.  I would appreciate it if you knew what a ball park figure would be. I
still have to find a way to mount a C/S prop to it and supply oil through
the shaft. It appears the Reno Racer had those types of props.

Cheers


Doug Fir

I have no idea Doug. Do you want me to call some of the Bell 47
used parts dealers?  The Reno DG1 racer did indeed have those types
of props but they were not working. Good luck. Not an easy thing
to do. With your shop it would be easier for you to make your own
PSRU using the Lycoming method of oil supply to the prop as in this 3D and
high buck Japanese gears :)


Paul Lamar ...No rotor no motor.

Paul

This type of gear box is rather out of my field of experience.  Way out. It
would appear that the Lyc. has the advantage of the long crank shaft and
lots of bearings to counterbalance the props weight. In your drawing the
long bronze bearing has to double duty in a short space right?  I could be
wrong but the Lycs bearing as designed is taking a lighter load.

Doug Fir

The problem is getting high pressure oil into the prop through
a rotating joint.

The plain journal bearing on either side of the high pressure
oil supply does double duty. First to react the considerable
prop gyro reaction torque... 600 foot pounds for a metal constant speed
prop at a pitch rate of 60 degrees per second and second to act
as a seal for the high pressure oil going to the prop.


Paul Lamar ...No rotor no motor.

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