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


   They allow high pressure combustion gases to pass back to the intake
   side. This would cause preignition. BIG no no!

       Dale Davies

       Possibly but there is one other problem.

       Paul Lamar

       Compression pressure bleedoff and out the exhaust.
   Low cylinder pressure and high exhaust emissions.
       Dale Davies

   Not exactly.

   What do you mean "out the exhaust." ?

   Paul Lamar


Compressed air/fuel can bypass from the compression side and out the previous combusted side before the rotor covers that extra "port". Air/fuel straight out the exhaust as the previous burn should be pretty much complete by then.
Dale Davies

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