IMHO all the space stuff is a huge waste of money.

 Paul Lamar

 Paul, I agree. This is a bit of a waste of money in my opinion. Too
 much technology is too much. If we keep up at this pace we will be
 living on a planet that looks like the death star not too long from
 now. LOL

 At least the wings have the "cool" factor I guess.

 End of unnecessary 2cents

 jenn kimball


 NASA/NACA had a good program going on the rotary as an aircraft
 engine awhile back. That went by the wayside when they got involved
 with all this space stuff.

 The third temperature chart is of interest right now and is relevant
 to the steel rotor housing air cooled one rotor. This is from an IAA
 paper back in 1984.

 ------------------------------------------------------------------------------------------------------



I found one of those NASA papers. Here it is. Quite comprehensive.

 Paul Lamar

 Paul, very interesting report. Surprised that the torsional coupler
 was after the gearset! I quickly scanned the doc, need to take the
 time to really read it over. Did the PowerSport, SuperLite fellows
 use any of this info?


 Steve Carlisle


 Take these  BSFC claims with a grain of salt. Later data shows they
 never got the BSFC below .47 while this paper claims below .40. It is
 unclear to me if that is with or with out turbo compounding.  Some
 say the direct injection equipment used in these test was not up to
 the job vis a vi RPM. Vast improvements have been made since 1984 in
 this equipment.  Stratified charge needs a second look with modern
 diesel fuel injection equipment.

 The Iannetti silicon nitride apex seals makes much of the apex seal
 work done here irrelevant.  Measured wear rates on the SN seals
 indicate a life of 20,000 Hours. Also the use of synthetic oil
 changes this picture.

 The same goes for the torsional resonate frequencies. We have not
 noticed any problems in the TTC engine what so ever and we have run
 it at least a dozen times for as long as 26 minutes. All we have is a
 silicone rubber coupler. This is with two different sizes of props.
 One three blade 68" in diameter that turns 8300 engine RPM static RPM
 on the ground.

 The other is 84 inches in diameter and we have had that up to 8000
 engine RPM in the air at altitude. Both with an ordinary planetary
 gear box of 3;1. No detectable problems of any kind and we idle the
 engine at 2000 RPM.

 In 1991 Mazda won the Le Mans race outright and the engine averaged
 8500 RPM for 24 hours.

 There is no reason to pioneer a new reduction drive. Low cost mass
 product planetary gears work fine.

 Paul Lamar

 What planetary gears are you referring to? I'm looking for something
 from 100 hp to 500 hp.

 Rob Miller

Ford C6 auto tranny and derivatives.

Paul Lamar

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