This has been an up hill battle. Several components where
improbably designed or improperly machined.
It has taken about 3 weeks or at least it feels like
3 weeks. Maybe more to fix everything.

The last thing that happened today was  some of the bolts
holding the rubber coupling to the counter weight were
too long and they locked up the e-shaft. Turns out the
female part of the rubber coupling was improperly drawn
or it was improperly machined. Easy fix with two washer
under three of the bolts instead of just one.

For the new guys this 1000 pound air plane will climb vertically
at 175 MPH with 8 times the power to weight ratio of a
C172 and an 84 inch diameter prop. The 650 HP turbo rotary
engine is under 200 pounds including the turbo.

If we get the record nobody else will beat us unless
they use another Wankel rotary. The record will stand for ever.

Paul Lamar

Hi Paul

Regarding the TTC gearbox , how much clearance is there between the inner and outer components of the coupling utilizing the 12 cylindrical drive elements ? Have you done any calculations on the expanding forces generated by the peak torque pulses on the cylindrical drive elements, especially after they have bedded in and developed a little back lash compounded by any clearance between the inner and outer components.
Regards

Bill Mc Donald

It is a light press fit. I would say one thou ( .001" ) max.

Well the outer part is steel and the inner part is aluminium so if anything
they will tighten up as the gear box warms up.
Also the two parts are bolted together with a half inch bolt
in the centre which will dampens any relative motion.

Max inner shaft shear stress is about 11,000 psi. The loads on the
3/16th" needles are higher. We did an FEA but I don't have the results
here at home. I'll get it and publish it.

We won't know anything for sure until we run it for awhile.
We will inspect it after every 90 second run.

Paul Lamar


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