If and when Mazda comes out with the RX9 it will be challenge
installing it in an airplane. Here are some 3D's I did. This is the
Big GT40 TC we used on the time to climb. Should be about 900 HP.
Enough to win at Reno.

It will get a lot easier if you move the engine 4 or 5 inches
further forward.  You might have to add a P51 style strake ahead of
the rudder to restore the direction stability. Our pilot has not
mentioned a directionally stability problem yet with the TTC.

Everything after RX9-15 is 5 inches forward.

This is just rough at this point and I will do another exhaust
manifold to make it easier o get the motor mount tubes in there.

Paul Lamar

Paul,
This is a what if kind of question. The design and dimensions of the RX9 engine is all there. Someone like Promaz in Australia ( Promaz.com.au ) could make the housings, plates and rotors. Designed for any accessories and water pump. Injector placement etc.
why I'm asking? Efficiency every ounce possible turbo compound clutched supercharger etc on pump gas. Maybe 3 rotor?
been thinking about a 400kt Carbon fiber plane forever and a day. Design has made leaps and bounds over the last few years but power plants are still lacking efficiency wise. Any reliability is out the window with piston engines at that speed. Or the weight and complexity makes it a no go.
Estimate around 20k for block and crank maybe less if their interested in the project.

Kurt Emerson


Paul,
This is a what if kind of question. The design and dimensions of the RX9 engine is all there. Someone like Promaz in Australia ( Promaz.com.au ) could make the housings, plates and rotors. Designed for any accessories and water pump. Injector placement etc.
why I'm asking? Efficiency every ounce possible turbo compound clutched supercharger etc on pump gas. Maybe 3 rotor?

been thinking about a 400kt Carbon fiber plane forever and a day. Design has made leaps and bounds over the last few years but power plants are still lacking efficiency wise. Any reliability is out the window with piston engines at that speed. Or the weight and complexity makes it a no go.
Estimate around 20k for block and crank maybe less if their interested in the project.

Kurt Emerson

Well it would not be wise to make the parts for e-shaft, rotor and rotor housings. These are tried
and true with thousands of hours. The end and center housings for the RX8 is another matter.
Since the RX9 is all aluminum even these parts will not have to be made.

The speed is going to be a function of the frontal area of the craft. That in turn will
be a function of how many passengers you would like to carry. One pilot and one
passenger can be accommodated in a semi reclining position with the lowest possible
frontal area.

My guess is a 3 rotor turbo would be wise at about 1000 HP for 400 MPH. It would need an intercooler
and perhaps water injection for take off.  Running on gasoline. The turbo compound part would take a lot
of R&D. It took us a year to get the TTC working well. We learned a lot so another
identical craft would take 1/4 of the time. With a cowling my guess is we could
go well over 300 MPH with the TTC and with a different prop..

So far nobody has built a small turbo compound aircraft engine let alone a Wankel
version.

The CW radial turbo compound was 3350 cubic inches.

Paul Lamar

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