Rino wrote:

Hi Paul,

My plane is a pusher type (Glass Goose) and I am using a Barry Bushing
just to take the motor thrust on the front of the motor.  What would be
a good Barry Bushing weight for that.
I don't know what would be the thrust of a 13b developing 200 hp.

Thanks

Rino

Got a drawing you can send Rino? Figure up to 1000 pounds.

Paul Lamar

I included two figures, hope this will help.
The front mount is for push only
The mount under the PSRU has only 10 lbs on it, just to keep the engine
balanced.
The two center mounts take the weight and torque of the engine.

Thanks

Rino

They will also take most of the thrust as they are far stiffer in the radial
direction than the front mount is in the longitudinal direction. 
The front mount can be almost anything. You can probably forget it altogether
with no problem. To prove it, anchor the fuse and apply a 1000 pound load
to the prop flange with a pulley system and the ass end of a small car
jacked up and then lowered... supported by the rope :)

Paul Lamar
 
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