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?  Looking in the 100 hp to
500hp, lol I have several projects in mind and after years of digging
the Mazda rotary is still what I come back to. Just worried since
they stopped making them is availability.

Bob Miller

Neil Unger is making Ford based gear boxes in OZ. Nothing is made in
the states anymore.

Neil Unger2 <unger1948@bigpond.com <mailto:unger1948@bigpond.com


Paul Lamar


Paul,

What happened to the guy in Colorado that you had making gearboxes?

Gary Knutson

He doesn't do email so it is hard to send IGES over the phone :-)

If I get my NC mill working I will start to make them.

Paul Lamar

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