You need to shorten the intake runners to 18" to 20" engines
for more  power with a 2.85:1 PSRU. Take off RPM will be 6500 to 7500
engine  RPM.

Also you will need my cooling book.

Shield the lower left motor mount bushing with ss from the
1500 F  exhaust pipe.

Paul Lamar

Jake, thanks for the pics. It is sad to see such potential
in a  project go unfinished. Let's hope you get a good deal on the
FWF  package, and get another rotary in the air.

Steve Carlisle

Thanks for the info, what is your cooling book? How would
you shorten
the intake runners with the air intake on the right side
like it is?
How much power difference would there be? I was planning on
wrapping
the exhaust pipes and will plan on a sheild for the motor
mount.

Jake

The plenum is unnecessarily large. Move it to the top of the
engine  something like this. You will save weight too :)

This is a P port but an optimized side port will work too
only about  50 HP less.

With the intake runners as long as they are now you will be
about 165  to 180 HP. You should get 200 HP with an optimized side port
engine,  2.85:1 PSRU and 18" runners at 6500 to 7500 take off RPM.
With a  P-port you would get 250 HP.

There are now better mufflers than that shown in these
pictures and
3D's.

http://www.rotaryeng.net/cooling.html

I also sell the book direct for cash $30 + $5 shipping in
the US.  More shipping over seas.

Paul Lamar


An admirable project !
BUT why do people constantly negate their efforts by
choosing THE worst
location
for the cooler and its air intake ?

Lutz Strobel

What location do you have in mind?

Paul Lamar

Away from the Propeller for starters.

Check the installations on Spitfire, Me 109 and Mustang for good
examples and P40 as well as Hawker Typhoon as negative.

Lutz Strobel

First; the Kay's & London wedge diffuser, now almost universally used in
Wankel powered airplanes  and most HVAC systems, was not invented until after WW II.

Compact Heat Exchangers. W.M. Kays and A. L. London Kreiger Publishing
Company. Malabar Florida. 1998  ISBN 1-57524-060-2


Second; the P40 and typhoon had no diffusers at all. WW I technology.

Third; the rest of the WW II fighters the cooling system added to the frontal area.
Drag is directly proportional to frontal area. The heat exchanger under the
engine does not add to the frontal area. Most had poorly designed diffuser
including the early P51.

How to Cool Your Wankel book page 42.

Quote:

"It is better to fit horizontally mounted heat exchangers under the engine or along side the engine on the cool side. This is facilitated by the small size of the Mazda Wankel engine compared to an air cooled aircraft piston engine. The two rotor engine is twelve inches wide by fourteen inches high by eighteen inches long not including the PSRU. This is much smaller than any piston engine of comparable HP. There is usually plenty of room under the engine for an horizontally mounted heat exchanger with the air exiting straight down through Venetian blind style cowl flaps. However planning ahead for this configuration is essential."

End quote.


Having it just behind the propeller is an advantage for taxiing.

Paul Lamar


going over these pics,  did tracy add a section to this engine?  why 3 exhausts etc?
Or am I looking at this wrong.

Jake


I am not sure what you mean by a "section".
The front and rear rotors share the center side exhaust port on RX8 engines.

Paul Lamar

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