Paul
 I am sending you the last design wich is an idea of George Grimes to
 use regular car engine crankshaft main bearings.
 I was looking to use the main bearing of an 10-540 and the price is
 about $300.00 with taxe and you can buy full set of car bearings for
 $35.00 each.

 I am using 4 set of bearing may be is enought or 5 set may be required.
 I looking to secure the planet with the crankshaft with woodruff key
 set at 2 or 4 places or splines, and machine longer small gears
 shaft on the planet and insert on crankshaft back plate. I can use
 both side of the trust engine bearing but i need an other trust
 bearing on back of the planet face . If i go this way i will have to
 make a mold for a casting. Make a look on it and i am looking for
 your comments.

 *Jean Prudhomme*

 Very clever idea George. I think this will fly. I am impressed.

 I like it.

 It occurred to me to use the stock Lycoming front bearing shell
 but this is better and cheaper.

 I have added some attached 3D's for this type of PSRU to your three dwgs.
 I was just going to get a junk Lycoming crank shaft and cut
 off the cracked back of it :)

 You won't need any castings as the housing is 2 pieces.
 I think it can be done out of billet on an NC mill.

 Paul Lamar


What is going to take the thrust imposed by the propeller in the air? You can
take the thrust bearing out  with riding the clutch or not adjusting the clutch.

Dale Davies

You are right. The thrust bearing is not shown.
In the Lycoming the thrust bearing is in the center of the
shaft so the tractor thrust bearing must be added in front
of the pinion carrier as in this arrangement.

Paul Lamar