This is from "Stratified Charge Rotary Engine Critical Technology
 Ennoblement Volume I" Page 253

 It is a chart comparing a 400 HP John Deere rotary with a PT6. The
 PT6 weighs close to maybe 600 to 900 pounds. Cost well over $100,000
 dollars. Fuel burn probably .6.

 Fuel burn on the rotary .5.  17% better.

 Rotary weight with gear box 250 pounds. Add another 30 pounds for the
 cooling system.

 I put in the TTC 2 rotor engine. Imagine a Mazda 3 rotor with the
 same boost. :-)

 Of course we are running Methanol so subtract a couple of hundred to
 run on gasoline.

 Paul Lamar

 I would say well over $100,000. One was bought by my friend for his
 Turbo Beaver, 4 years ago, a unit overhauled, which he bought at
 auction for $230,000CDN.

 Steve Carlisle

 Wow!!!

 It never seizes to amaze me how dumb people are. Does it take a
 degree in physics or mechanical engineering to see the potential of
 the Wankel? Do they fully comprehend the importance of power to
 weight ratio? Must the skies be full of Wankel powered airplanes
 before they realize that they really work?

 Are they hung up on 5 to 10% worse fuel burn? That could go away with
 one additional invention.


 Paul Lamar

 Maybe it's the certification issue?

 Steve Carlisle

 Austro engines have a 100 HP 2 rotor certified. I don't think the
 owner of Austro engines really understands the rotary :-) He has been
 hung up on diesel aircraft engines :-)


 Paul Lamar



 Seems strange that there seems to be no obvious reason why companies
 like Curtiss Wright, John Deere and Rotary Power International all
 seemed to abandon the Rotary Engine technology.

 Steve Carlisle

In the case of RPI they just went bankrupt.

Yes it does. I think when the truth came out that the stratified charge did not work
that gave those companies a bad name.  I think John Deere tested it and
discovered CW was lying. There was also an anti rotary campaign by the wacko
environmentalist which they justified on the 10% worse BSFC of the Mazda..

Since RPI there have been advances in CFD that allowed a simulation
of the air flow inside the combustion chamber. IMHO that revealed the problem
of why the stratified charge did not work. Also some advances in high
pressure fuel injection have been made since then. Not that that alone
is going to help.

BTW can anybody tell me why my air passages in this rotor housing
are a bad idea? This is a quiz.

Paul Lamar

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