Hey Paul,

 I heard about a material called Titanium Aluminide. It can be forged
 and machined. It's light and can withstand high temperatures. Maybe it
 would be a good material to make some 20K RPM rotors from?

 http://en.wikipedia.org/wiki/****Titanium_aluminide<http://en.wikipedia.org/wiki/**Titanium_aluminide
<http://en.**wikipedia.org/wiki/Titanium_**aluminide<http://en.wikipedia.org/wiki/Titanium_aluminide
 http://www.precast.com/

 Mark LaPierre

 It is higher density than aluminum at .144 pounds per cubic inch.
 Aluminum is .1 pound per cubic inch. Iron is .3 pounds per cubic inch.
 The really trick alloy for rotors is beryllium aluminum at .07
 pounds per cubic inch. Half the weight of Titanium Aluminide.

 Paul Lamar

 It's BA is probably much easier to fabricate than TA too.

 Mark LaPierre


 Titanium aluminium is more readily available, it would be Worth while to
 try it (M.H.O).
 Maybe those guys who were looking to do something innovative with the
 rotary engine
 could build a gama aluminide one rotor ;proof of concept FWF for a
 Ran's s-19 for example.
 P.S. what's up with them anyway?

 -clifton younger-

 You won't get 20K unless the density is much less than aluminum.

 Paul Lamar

Probably wouldn't need to go 20k. just needs to be at lest the same
weight as the rotax FWF, 130 hp and close to the rotax price,read no more
expensive than a rotax installed.

clifton younger

Rotax's are $20,000. HP is barely 115 for 5 minutes max. Installed weight
is 166 pounds.
TBO is 1200 when your throw away most of the moving parts like crank,
rods and pistons.

A 125 HP all aluminum turbo one rotor could be had for less than half that
and would not need to rev past 7500 RPM.

Paul Lamar

The reason to maybe use gama aluminium is it's high heat tolerance.
I forgot it's slightly heavyer than aluminium but it's still valid for the
one
rotor concept needs 130 hp continuous, 166 lb or less,the ability to
take it beyond 130 hp (gama aluminium), cost less than rotax (20,000).
the high price because they wanted to eventually make money on the
whole business,  this so they can surpass the rotax engine.
all do able for a cottage start up.
clifton younger