Into the separate thrust needle bearing.  Same as the Ross.
Paul Lamar

I am now enlightened. for the thrust bearing I would still like to
see one using the tapered rollers to prevent skidding and scoring of
the thrust bearing at low lube levels. I'll see if I can find a

bearing

number we could use. Thanks Bill Jepson

That would up the cost.
Also you have a preload and differential heat expansion problem with
tapered roller bearings. Here is an earlier concept using the light

weight tapered

roller bearings with part numbers. It is better to use bearing lock
and replace hardened sleeves for the needle bearings if you are worried
about that. As far as I know nobody has worn out a Ross shaft yet.
It would probably be as easy to replace the whole shaft as the planet

pinion

shafts are also welded to the main four inch prop shaft. They wear too.

Note also going just one inch larger on the shaft eliminates the
the steel prop flange and places the load directly into the prop
drive dowel pins. Also the bolts on the inner end are eliminated by
welding the planet pinion shafts to the prop shaft.

BTW I need to redo the 3D based on this dwg. I over estimated the prop
drive dowel pin circle diameter. Its looking better and better the more

I get

into it.

Paul Lamar

Use a SAE 2 PROP HUB FLANGE
smale@ncinternet.net

This is looking easier and easier. I redrew it using the actual dimensions
of Tracy's prop flange and the 3.15:1 gear set. It looks like we can make

the

shaft on a large  NC lathe economically. I also used the same size
needle shaft bearings front and back. Namely four inch ID.
This simplifies the housing  probably allowing us to  tig weld
it out of relatively thin wall aluminum tubing. Five inch 1/4 wall.

I added another thrust bearings back to back to cut the RPM and
greatly increase the life. The thrust bearing that can be used
is 3.75 ID 4.625 OD. Limiting RPM is 3500 RPM and max thrust
capacity is way overkill at 11,000 pounds. These numbers must be
adjusted for life factors and actual RPM used.

Paul Lamar

Use a SAE 2 PROP HUB FLANGE
smale@ncinternet.net

The new drawing reflects the use of the SAE 2 prop hub flange.

Paul Lamar
 
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