Pix of unknown rotary at Oshkosh yesterday.  You folks that are
 there, any details on it?

 Sam Chitwood

 If it did not run it could be phony :)
 Find a bunch of existing castings and cobble them up
 to look like an engine.

 Experimental aviation is the happy hunting ground of charlatans
 and scam artist. Are they selling stock yet? :)

 http://www.rotaryeng.net/What-is-a-rotary-engine4.html

 Paul Lamar


I was there yesterday, for one day only.  I saw this exhibit [in the
Rockwell hangar?...same hangar as DAR Corporation booth]
and I spent some time chatting with them.  They are from New
Zealand, and are looking for investors [see Paul's very wise
remarks, below!]  This is NOT a working engine, in fact, the crank
does not even turn.  It's internal design can be seen on their
website

http://www.dukeengines.com

...check out their 'home' page, under 'technology' video.  It uses
a swash plate, and axial sinusoidal movement of pistons moving
that plate, which turns the shaft.

Gene Kahn

The illustration on the web site is totally dysfunctional.

If the housing is stationary the pistons move back and fourth
so it is not a rotary. If the housing rotates and the pistons are
stationary like a WW I radial
rotary there is are lots of problems similar to a WW I radial rotary.
Cooling for one would be a major problem.

Scam pure and simple.

Paul Lamar

This type of engine gets reinvented every 20 years or so.  The crank
system can work fine.  It has a rotating cylinder block with ports in the
stationary end housing.  How can they seal, cool and prevent ware of the
sliding surfaces and the rotating cylinder block.
It is a bit more compact than a conventional piston engine but not near a
Wankel.  Paul's right.If they get funded, they are smarter than me.


Murry I Rozansky

Some years back, Cessna built a 5 cylinder  engine with a similar crank
and cylinder arrangement but with a stationary cylinder block and
conventional valve train.

Murry I Rozansky