seeing your articles I was interested by the Wankel engine. How can I
 buy a used engine and how to prepare for use in an aircraft. need for
 engines of 100 hp and 180/260.

 thanks
 Ivan

 The best way is buy a running 1989 to 1992 RX7 car for under $2500
 if you can find one.


 Paul Lamar


Ivan,  Another possibility is get a late mode 2007 or newer engine on
E-bay for about  $2700 or from an auto wrecker/salvage business. Get one
from an automatic transmission car which  has a much lighter flywheel.
The motor mounting plate from Jeff Doddrige as well as a relocated
water outlet block.  Real World Solutions has a well proven propeller
speed reduction gear box with planetary gears and also the engine
management system for the fuel injection and ignition.  You will need an
intake manifold fabricated with 18-1/2" long runners from a common
chamber manifold and the stock Mazda throttle with the electronic
throttle position sensor. The motor mount tubing design is available on
this news letter from Paul Lamar. Get the book by Paul Lamar about "how
to cool your Wankel"  and the one from Tracy Crook at Real World
Solutions about aircraft conversions and the video tape about how to
rebuild a rotary by Bruce Turrentine.  If you can attend the Oshcosh
Wi air show in July or the sun-n-fun event held in lakeland Fla in april
you can see flying examples in the homebuilt areas.

    The operating RPM in cruise takes some getting used to at
6200 RPM. This is where the combustion pressures and centrifical forces
of the engine are in balance and at lowest mechanical stress.  This is
2/3 of the RPM the stock engine is rated at so the HP will be less than
the stock number due to the lower RPM.

  A two rotor side port makes a reliable 160HP virtually forever
while one modified for periphial intake ports (Jeff Doddridge also does
these) makes 250HP.  If you need more HP the common path is to use the
three rotor from the Cosmo model of Mazda sold in Japan and Australia.

  You can get a cowl designed in Rhino4 (a CAD program) if your kit
doesn't have one, however the rotary fits just about anywhere a 320 or
360 will fit so a kit supplied cowl should be workable. Some
narrow tandem seat airframes (RV4 and RV8) have been done with all the
cooling ducts and radiators inside the stock cowl.

  If you post what country you are in there may be someone near you
building or flying a rotary that you can plan a visit to. Also what
airframe you have in mind might get some postings of installations from
the news group on that model airframe.

george grimes