Doing away with the starter was a big help.
This is a 1/8 inch thick spun aluminum bell housing
with an internal doubler stiffening up the front face.
Light weight hollow  prop shafts and needle bearings are nothing
new. The Ross has used them for years with no trouble.
What this design does is do away with a conventional prop flange.
Prop drive studs are welded directly to the hollow prop shaft.
It also simplifies the attachment of the planet carrier to the
prop shaft by welding special planet gear shaft directly to
the hollow prop shaft. This does away with another flange
and reduces the length of the load path.

These are only a couple of its advanced features :)
Like the Ross it uses needle prop thrust bearings. That too
has never given any problems in the Ross.

The Ross is one of the lightest weight PSRUs ever built
for the rotary and properly machined early versions are still
in wide spread use.

Paul Lamar

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