Paul

 Thanks for taking the time to work on rotary engine conversions for
 aircraft,
 I, like you, believe it is the best engine out there for the job.  I have
 a Wittman Tailwind W8 with an O200.  When the engine needs overhauled Id
 like to have a rotary to go in it.  It seems like the Masda's may be to
 heavy wet for the application,  what are your thoughts?

 Phil Burgess
 W73
 Mid-Atlantic Soaring
 Fairfield PA

 Yes it is too heavy for a direct replacement for the 100 HP O-200 but
 recently
 somebody has joined the news letter that is quite reasonable when it comes
 to
 making NC milled aluminum parts. His name is Jeff Doddridge.

 We have been kicking around a design for a relatively low cost front and
 rear rotor housing made from aluminum which would yield a 125 HP Mazda
 based
 one rotor engine competitive in weight to the 100 HP O-200.

 Here are some 3D's and a picture or two.

 Richard Sohn is also working on an aluminum version of a one rotor Mazda.

 Richard Sohn <res12@fairpoint.net

 Paul Lamar


 Put the full 2 rotor 13b on the Tailwind..  People are putting up to
 O-360's on Tailwinds, with the O-320 being the engine of choice.  My
 impression is that it's relatively easy to build a 13b which matches
 the weight of an O-320..


 Matt-

 If you go that route we have plenty of installation layout dwgs.

 We also have a new asymmetric motor plate allowing a cool side mounted
 rad.


 Paul Lamar

 Paul,

 With a fuselage tank, is there any place an aircraft (updraft) carb
 could be located to have gravity feed fuel?  I'm thinking light
 weight...  How about p-port engine..  Carb mounted on a longish runner
 low and aft on the cold side of the engine with a plenum that connects
 the p-ports to the runner..


 Matt-

 Interesting idea Matt.

 That should work fine if you have several inches of room over
 the engine. You wind up with a rather large plenum but that should
 be OK if it is made out of stiff stuff like carbon fiber as the
 collapse loads will be high when the throttle is closed.
 You will probably need a couple of anti collapse columns
 inside it.

 Got any cheap used aircraft up draft carbs lying around?

 Paul Lamar


Paul,

What happened to "keep the throttle plate close to the p-port" idea?

Mark S.

Good point.

How do you propose doing that with carb mounted on the cool side :)

If it is an RX8 engine it won't matter.
Side exhaust ports.

Paul Lamar



Paul,

So, that only pertains to p-port exhaust engines?  Makes sense, now that I
think about it.

Mark S.

I was amazed the p-port EX8 engine idled so well with a Weber carb.
I think Mazda should go with my trap door RX8 engine immediately.
http://www.rotaryeng.net/RX8-p-port.html

Paul Lamar