Paul...This looks interesting for aircraft applications:

http://www.gizmag.com/duke-engines-axial/33631/?utm_source=Gizmag+Subscribers&utm_campaign=7b7ef0c546-UA-2235360-4&utm_medium=email&utm_term=0_65b67362bd-7b7ef0c546-90961537 Ron Grable

Very similar to the Dynacam. Certified for aircraft years ago.  It was designed as a torpedo engine.

It would not run over 2000 RPM so that limited it for small planes that need props
to go to 2700 RPM. Duke's joint between the piston rods and the wobble plate looks to be an improvement over the dynacam line contact arrangement.

The VE on the the Duke  engine will also be excellent. Like a p-port on
a Wankel. The reported resistance to detonation is probably because there is no
hot exhaust valve in the combustion chamber.

This mechanical configuration is common in high pressure hydraulic pumps.

Paul Lamar

USPTO, patent # 8,733,317 B2, Gotek engine
USPTO, patent # 8,689,674 B2, Duke engine

(I wouldn't invest in either).

Rolf Pfeiffer

Both engines have something in common with the Wankel
and that is a moving combustion chamber.
Air has viscosity, adhesion and mass. This along with the
moving combustion chamber distorts the combustion
process. A good analogy is the air under a car. Some of
it is attached to the belly pan and some is attached to the road.
The rotor is the moving car and the rotor housing the road.

The mixture is also not homogeneous. Some parts are richer than
other parts. It is well known that a centrifuge can separate
the fuel from the air. This means the mixture coming in
from the intake  ports must change direction. This causes the
mixture to be accelerated in a different direction. This acceleration
has a 3D affect on the mixture tending to stratify it in complex
ways. Then you have the  centrifugal outward affect of the rotating rotor.
The Gotek would suffer from this as well.

This is the reason a high percentage of unburned
hydro carbons are found in the exhaust of the Wankel
and the BSFC is about 5% worse than a piston engine.

I would not be a bit surprised if the Duke and the Gotek
both suffer from the same problem.

This is why I am spending a lot of money (for me) developing
a high speed multi spark ignition. Six sparks at 10,000 RPM. This is
a shot gun approach because I cannot afford the really big bucks for
the  sophisticated R&D necessary to totally understand what is really
going on in the moving combustion chamber. It may be we will
never burn the mixture adjacent to the moving rotor.

Perhaps what is needed are several spark plugs built
in to the bath tub in the  rotor face. Not as difficult as it
seems.

The jet engine people have spent billions on the R&D of
combustion chambers.

So far not enough money has been spent on the Wankel
combustion process to completely understand it

If we really understood it I am sure we could fix it :)

Paul Lamar

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