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

Yes, I was thinking of doing exactly that, a large carbon fiber shaft
extension with a much larger hub diameter on the fan than I have now. If
so, what would I do to the aluminum flywheel to beef it up?
Here is a drawing with the larger fan hub, longer duct exit that is
almost straight. The expanded exit area comes mostly from the large fan
hub tapering to a exit cone. There would be no rad inside the cowl, I
want to put a surface rad all around the inside of the duct exit. Maybe
adding heat to the air back there will add pressure and thrust!

Perry

OK here it is.

Paul Lamar

Excellent! Thanks.
Do you think ejecting waste heat in the duct exit will increase thrust? Or
maybe it's just a good way of using the available surface area and lowering
cooling drag.

Perry

I doubt it. One must compress the air first and then add heat. The thrust effect on 
the P51 Mustang was marginal at 400 MPH.

Perhaps on the cooling drag because you would be doing away with the water rad.

Paul Lamar
 
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