Don Dunbar wrote:

Hi there Paul,
There has been little progress over the last few months as I have been

very busy at work.

The PRSU has reached the final stage with some small modifications to

take place.

I have attached some photos for you and the group.
All up wieght including the bell housing, flywheel and drive flexy

coupling is 21Kg or 46lbs.

I sent an earlier drawing that did not show the critical thrust bearing.
Here is a later drawing showing the necessary sun gear thrust bearing.

Don, when I get some time I will do a 3D of your Mustang II engine

compartment.

Robin is already bugging me to go back to Australia. We may leave any

minute :-)

Paul Lamar

Looks pretty good Don.  These are pretty nit picky points and probably not
cause for concern.

The thrust on the ring gear bulkhead is normally carried by a bearing on its
face.  In your design the thrust is being transmitted through the splined
neck.  This will increase the stress at the corner of the bulkhead and neck.

One of the biggest problems I had with the Ross drive was related to the
lubrication scheme.  I don't see how you did the distribution of oil in your
design.  Could you show us how it's done?

Tracy Crook
tcrook@rotaryaviation.com
www.rotaryaviation.com

Don Dunbar wrote:

Hi Tracy and Paul,
Thank you for the comments and advise on this project over some time.
Tracy are you talking about the thrust between the planetary carrier and the ring gear bulkhead. It is not on the dwg but I used the standard Ford part 670 for
the E4D Transmission.
The lubrication is what I am procrastinating about now. Will I use a pump or not.
Paul say hello to Robin from Nidia and myself. You are alway's welcome in my house.
The weather is on the improve from now on. it has been a cold winter.
Regards Don 

Thanks Don. 

I think Tracy is talking about right here.
The bulkhead in question is made from powdered metal and that is
what Tracy is concerned about I think. They can be broken if hit
with a hammer. You have room for a needle thrust bearing (shown in blue)
between the bulkhead and the clamp ring (thickened) that holds the 
rear prop shaft bearing. 
 
Also shown is my recommendation of how to get oil to the sun gear.

Paul Lamar

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