Le roux,
                  First Lou Ross was an excellent machinist so tolerances are tight.  I suspect that the ring gear may be threaded and then loctited??  I am guessing in the dark without being unable to sight  "in person" Then in order to get bearings over the shaft, one of the ends must be able to be removed.  I can understand the oil holes to allow movement of oil for lubrication and possibly cooling.  So it appears that Lou assembled the bearings on the shaft and then the final assembly was the prop shaft to hold all together, hence the 3 pins.  Are thrust bearings behind the prop flange or in front of  the ring gear.  How did Lou allow for thrust both ways?
Without a fixed ring gear the rotation will be less in RPM and counter clockwise.  
You say Ford g/box bits available?  Can you tell me where, as to date no one in the US will answer emails let alone sell me bits?  What is the prop tip speed at 2900 rpm?  Seems high, so must be smaller dia than normal?    Nothing like a guess to be verified in practice.   My experience with P ports is that they do give a little extra HP, but not as much as Paul Lamar often quoted.  However just get flying and then fiddle, or you may never leave the ground -- we all fiddle too much and go by hearsay far too much.
Regards,  Neil.  

-----Original Message-----
From: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Thursday, March 18, 2021 9:23 PM
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: [FlyRotary] Ross Redrive Dimensions

Neil: I got it wrong the propellor flange and ringgear flange is not the same.
Can’t figure it out ? how the ringgear side flange is stuck to the hollow shaft.Seems to me it has thread that screw in. Somehow it must be locked. I did not removed the pilot bearing as there is no need to do so as it is still brandnew never been used.
The propellor flange has 3 pins that holds it in place after the pressfit.
The hollow shafts needle bearings ,run over the oil holes in the shaft, and there is some holes between them too.


This psru is counter rotating and a 2,17 : 1 ratio.Therefor needs an anti - clockwise prop pilotside view. I am planning to put in just a 6 pinion planet steel casing planetary No other modifications to be done.There is a  6 pin planetary with 12 lug available to drop into the housing.
I believe with the 2  - 44 mm p ports @ 6500 rpm will have sufficient Hp for take off and climb turning the prop at 2900 rpm.
The at “top of climb “ level out and cruise at 2300 prop rpm.