Everybody,  I just talked to Atkins rotary.  They will provide as an
assembly a single rotor/eccentric/flywheel/balance weights.  Assembly
is balanced to within a gram and guaranteed to run smoothly.  The
eccentric is cast.  They make the complete single rotor engine for
marine application.    While I don't like the idea of a cast
eccentric, on the other hand it is very short and therefore very
stiff.   The price is $1500.00.
What do  you all think?   Also they quoted  $150.00 for a set of
tension bolts.      Jerry

Jerry,
I spoke to the metallurgists who tested the Rotary shaft for me( they are
aviation accredited) I suggested to them that I was considering casting some
and they suggested to me in no uncertain terms that because of porosity
problems, they could in no way recommend a cast crank for Aviation use. I
will leave it to you to make the final decision.

I have found a local chap to turn my single out of 4140, he's a neighbour
and is doing it as a favor so will cost me a couple hundred bucks. That's
not including the cost of material  grinding, heat treatment and final
runout checking and adjustment with final polishing. However I have asked
him to work out a cost (given the first is an assessment of time and method)
so that he can quote on providing the same thing to others.
I did ask Larry to consider this on two occasions, but as yet he hasn't
responded.
George (down under)

A one rotor e-shaft is not highly stressed. The same output e-shaft diameter supports
the torque from a four rotor engine. Cast iron, if done properly, will work
fine for a one rotor. Wankel Gmbh Germany patented a hollow e-shaft hydro formed
from thick wall steel tubing.

Paul Lamar

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