Paul,
 I enjoyed your article in the Feb. issue of Sport Aviation.  I have followed
the rotary engine development through many developers such as Duncan's models
in the early 80's, the Blanton Cessna installation and a gentleman named
Youngblood.
  I was involved in the early 70's at Lordstown Ohio when GM changed the Vega
to the new model Monza and reworked the floorpan structure to make room for
the Wankel that they were proposing.  Unfortunantly, GM got cold feet.

  Anyhow, I have a question maybe you can answer, you stated in the article
that there are aluminum end plates available that can save 50 pounds but are
expensive.  My question is how expensive?  100 dollars ea or 1000 dollars
each, the other thing is where are they available?  I am looking to build a
single rotor engine from a 13b and can not tolerate a lot of weight.  Got any
idea what the weight of a single rotor engine with reduction unit would
weigh?  I saw one on your web site built by Yaw for a guy in Canada by the
name of Gerry Heis.
  Thanks in advance, again I really liked the article.
  Jim Vachuska
   eaa 181935
  e-mail  Vachuska@aol.com

Last I checked Racing Beat is getting $1200 each. I also don't think
they have a front cover.

I would say close to 180 pounds with PSRU less intake manifold, exhaust manifold
and all other accessories such as alt and starter. A one rotor Mazda does not
have as good a power to weight ratio as the two rotor. Part of the problem is
the balance weights necessary to balance the one nine pound rotor. In a two rotor the
engine is partially balanced by the other rotor.

Are you on our email list Jim? We have talked about making your own
two pieces aluminum  end housings. Requires an NC mill because it would
be very tedious to make one by hand. It also requires  a modified rotor housing
with a peripheral port. Here is a sketch.

Paul Lamar

How much HP does the 13B make at 3000 rpm? There might not
be much weight difference between a stock 13B 2 rotor direct
drive & a 1 rotor with reduction drive.

Charlie England

True. Probably less than 80 HP. A lot depends on the porting and the
length of the intake runner.

Paul Lamar
 
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