I PAUL
 I FOLLOW YOUR RECOMMENDATION TO DESIGN WITH NEEDLE BEARINGS
 AND I CAME UP PRETTY GOOD BUT I NEED YOU TO LOOK AT IT AND
 COME BACK WITH YOUR RECOMMENDATIONS.
 I AM SENDING YOU 3 2SHEETS WITH DIMENSIONS


 Jean Prudhomme


 That is looking a lot better Jean.

 Make sure the prop flange is the same as one of
 these SAE standards. The big one is for wood props
 and the smaller one for CS props.

 Paul Lamar

 P.S. Here is one of Doug's old email messages on the subject.

 -----------------------------------------------------------
 I found out this info from an aviation talk group. About
 bushings source - still no luck with the thread type with
 flange. I imagine they are hot pressed in place. Hub
 thickness is still an unknown. No lightening holes in mine. I
 heard one person say thickness equals 0.41" for a IO-540 and
 thats is about 10.4 mm. Mama mia!! That is overkill for forged
 4130. The Bell 47 prop shaft OD diameter is 3" so on a SAE #2
 the overhang is less than 1.5". 6 - 7 mm thickness should be
 adequate. And yes the shaft will be VERY hollow.


 SAE AS127D --- it is a grand total of 3 pages.

 The following is a summary:

 SAE #1 0.375, 4.375, 5.5, 3.38, 0.624, 6, .375-24UNF-3A, 0.500, 0.500,
0.500

 SAE #2 0.375, 4.750, 6.0, 3.50, 0.624, 6, .375-24UNF-3A, 0.500, 0.500,
0.500

 SAE #3 0.375, 5.250, 6.5, 4.00, 0.624, 8, .375-24UNF-3A, 0.500, 0.500,
0.500

 The format of the above numbers is:

 Bolt Dia (in), Bolt Circle Dia (in), Flange Dia (in), Prop Thickness (in),
 Drive Bush Dia (in), Number of Bolts, Bolt Thread, Drive Bush Height (in),
 Bolt Minimum Thread Length (in), Max Distance of End of Bolt From Face of
 Hub (in)

 Generic Dimensions:

 Radius on Corners of the Drive Brushes and Flange 0.03-0.06
 Main Flange Centre Boss 2.248-2.250 Dia OD and 2.007-2.009 ID,
 1.000" Height above the flange.
 Radius between flange and center boss 0.190" Max
 Radius on upper corners of center boss 0.03-0.06"

 Cheers

 Doug in Japan


Thank,s Doug i know i still have to make change before i detail all parts

Jean Prudhomme


Jean,

Looking good!  I have only a few things to ask:  is a drain planned at the
needle bearing near the prop flange to get rid of dirty oil?  The ratio is
high enough, should the oily bushing be under engine (prop gov) oil pressure
(or be a needle bearing)? I am not familiar with prop gov operation, will
oil leakage thru the needle and thrust bearings affect operation?  How are
the sun/planet/ring gears lubed?  Does the thrust bearing no1 on the prop
shaft have enough support (being next to the needle bearing the land in the
case is relatively narrow)?

Dan F