Perry Mick wrote:

Paul:

I'm really intrigued by this.  I think I would prefer to make the
fan blades composite, maybe with just an aluminum heat-shield
cover near the tips.  Any details on making that steel turbine
ring?  Could be a lot of weight out where you don't want it.
Would you run this at full RPM, or maybe a lower RPM
for lower centrifugal force?  Maybe you can put some more
numbers on it to see if it's feasible?

--
Perry Mick
Duckt N7XR
http://www.ductedfan.com

You have a heat issue with composite blades. That turbine section will
run hot. So far no numbers but I'll bet Monty will work on it :-)>
50% of the energy in a gallon of fuel goes out the exhaust in the
form of waste heat. Lots of potential to recover some of that
energy here. There are also lots of engineering challenges with
differential expansion being a big one.

Paul Lamar

I've been thinking about it, to apply this to mine, I would have to
put the driven fan on a long shaft, put the aux fan in front of the
driven fan (because it's a pusher) for the exhaust to drive the
aux fan.  The exhaust goes through my composite fan now, but
it's a few inches away.

I'd like to see Monty work on it.

--
Perry Mick
Duckt N7XR
http://www.ductedfan.com

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