Every body had a fine time. Perry Mick could not make it up due to weather

Perry Mick wrote:

Paul, who gave you the flywheels? Rick Girard modified a Racing Beat
aluminum manual flywheel for me so my prop adaptor will bolt on and
align with it. Thanks to Mike McGee they were delivered to me today. I
had never weighed the parts until today, using a cheap bathroom scale.
The aluminum flywheel with the bolt-on iron clutch surface removed
weighs only 8 lbs. while the stock iron flywheel weighs 23.5 lbs! So by
doing the swap I will save 15.5 lbs.! I'm only a little concerned about
the strength of the aluminum as it's only about 1/4" thick in places.
Talking to Ken Welter at Arlington a year ago he thinks I should stay
with the heavy flywheel.

Perry

I am not sure who it was. It was delivered to the tent during the panel
discussion. Brian or Richard may know. A heavy flywheel is easier on the
direct drive prop as torque pulses are mitigated. If you use the aluminum
flywheel make sure the counter weight is the proper one for your rotors.
Same goes for the cast iron flywheel.

Make a cross section sketch of that aluminum flywheel and I will take a look.

Paul Lamar

OK, here is DWG drawn to scale, to the nearest .05 inch as I was able to
measure. You should be able to open this in Rhino.
The flywheel is thicker than 1/4", the prop drive is 5/8" thick so would
act as a stiffener.

Perry

I think the red part hurts rather than helps. It would be better if the red
prop extension adapter had a smaller diameter and bolted to the flywheel adjacent 
to the hub. The flywheel is acting like a diaphragm with a high bending
moment applied to the center. This leads to high bending stresses around the hub
in the flywheel part.

Perhaps you can re machine that part.

I'll do another sketch. I don't have a counter weight here so a drawing
of the counterweight showing the bolt circle would help.

Paul Lamar

 
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