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 something like this would be safer and lighter with the aluminum flywheel.
All the loads go into that counter-weight/flywheel-hub sooner or later.

Unless of course you wanted to use a large diameter composite shaft extension 
like Charlie Airesman did and then I would suggest beefing up the aluminum flywheel. 
There are simple ways of doing that without adding too much weight.

Paul Lamar
 
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