Don Dunbar wrote:

----- Original Message -----
From: "ACRE NL" <rotaryeng@earthlink.net>
Sent: Sunday, March 03, 2002 12:18 AM
Subject: PRSU

Don Dunbar wrote:

Hi Paul and group,
Attached the Velvet drive drawing, This can be found at

www.marinegears.com/index.html

The bearing spread does look marginal for an aircraft Don.
As much as 600 ft pounds due to prop gyro torque can be applied
to the output flange of an aircraft PSRU.

A boat PSRU never sees anything like that much torque.

What is the distance between those output shaft bearings?

Paul Lamar

Paul the output bearing look to be 4" apart, this would be overall the

two.

I will dismantle the rest to check the bearing centers in the next few

day's

or ask the guy who rebuild's them.
He had many of these boxes in his workshop.
Don Dunbar

Four inches sounds pretty good. Especially for wood props.
How thick is the flange it self?

Paul Lamar
The prop flange is .34" with 4.25' PCD.

   The outer bearing is 3.25 OD and the ID looks to be 1.5.

That IS a thick flange. Is it cast iron? The bolt circle will be 
a bit marginal for wood props.

Paul Lamar
 
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