Paul, no problem to 9000 rpm.
  But you should never need anything that high in an aircraft!
   From one of the threads, "3ms will net around 115mj".
  Price is higher, about $75 each.
  Barry

  The rotary is a high RPM engine. 3.12:1 PSRU's are in the works.

  Paul Lamar


  Paul,
  I think you will want to avoid continuous operation in the 9000rpm
  range because of the tooth loading on the stationary
  external gear. (Yamamoto '71, p.49)
  ( see attached)
  Barry

  Very good Barry. I like to see references for claims made.
  Thanks

   They have made some advances in this area in 1984.
  This is from SAE 841017. The solution was trivial and very low cost.
  They added 3 small roll pins.

  The paper is available on the web site.

  http://www.rotaryeng.net/1984-recent-tech.pdf

  Page 9.

  Paul Lamar

 Most rotary engine machine shops recommend the roll pins or circlips, as
 mentioned, hardening treatment of the stationary gear
 http://atkinsrotary.com/store/13B-Rear-Type-I-Hardened-Stationary-Gear-10015.html
 as well as bearing and rotor clearance for engines that run above 8500 rpm.
 Speed costs !!!

 Graeme Riley

 Most of that is done on the RX8 engine. The red line is 9000.
 I think the gears are a bit wider as well.

 Paul Lamar

 Well there you go, I wonder if we could get hold of a 16x it probably
has more improvements. Mazda must have some tooling done. Just a quick
question regarding direct injection, if one was to increase
compression ratio to say 16:1  or higher would it be possible to
control ignition timing using the injection timing?
  Graeme Riley

With the current geometry 16:1 is out of the question.
SuperTech might be using other geometry.
Supertec also claims a .44 BSFC. We shall see. The Mazda best
so far is .47.

Paul Lamar


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