I watched the video. They claim 0.5 pounds per hp per hour. Since our
piston engines are typically in the 0.4-0.45 range, it's not as efficient.
It makes around 2 hp per pound, so it's a lot lighter than piston engines.
They are also looking at Jet A fuel, so it may do somewhat better.
 Instering...
 Ted Noel

There are so many new ideas for engines to replace the good ole piston
engine, but almost none of them ever make it into production.  The ancient
piston rules.  Here is another one of those new engine ideas which seem to
have several significant advantages over piston engines (No one usually
lists the disadvantages).  This one can be compression ignition, 2 to 4
times the power to weight, multifuel including JP8, more efficient, far
less vibration, less complex, and can be self supercharged.  You are going
to like this one.

http://www.engineeringtv.com/video/Nutating-Disk-Engine-Delivers-H

Paul,

This was posted on the Lancair list concerning the "nutating-disk engine".
 The video doesn't actually show it running, and quite frankly, I don't see
how it could run.  Have you seen this one before?

Mark

Effective gas sealing and cooling would be a nightmare. This will never see the light
of day.

Paul Lamar

By Kenichi Yamamoto from his book "Rotary Engine" 1981

1.3     REQUIREMENTS FOR A PRACTICAL ROTARY ENGINE
        Although various types of rotary engines have been
developed to date, there are few that do not qualify as internal
combustion engines or do not qualify as a practical engine even
if they satisfy the qualifications of an internal combustion
engine.
        The requirements for a rotary engine to be qualified
as a practical internal combustion engine can be summed up in
the following five items. The practicality of various ideas on
rotary engines can be judged by evaluating them by these
criteria:

(1) Every moving part, including the timing mechanism, should
make a rotating motion. A mechanism having a reciprocating
inertia will increase mechanical noise and vibration, and will
work against high speed and high revolution.  [In addition
mechanisms that reciprocate generate reversing loads. Reversing
loads lead to reversing stresses. Reversing stresses lead to
metal fatigue and limited life. The Wankel rotary engine has no
reversing stresses therefor the life of the major parts such as the
eccentric shaft and rot0r are unlimited unlike, crankshafts, connecting
rods, pistons and poppet valves. Paul Lamar]  Accordingly, structures
that require intake and exhaust valves and mechanisms using the rotors
oscillatory motion are not desirable.

(2)     Gas seals or the working chamber should be three
dimensionally reliable.  The gas seal mechanism of a rotary
engine should be constituted by connecting the individual seals
three dimensionally. Among the many ideas we come across are
those that don't show such three dimensional thoughts.

(3)     Appropriate gas exchange of intake and exhaust should
take place. Together with having a mechanism that can correctly
open and close the ports, sufficient time for intake and exhaust
should be provided especially for high speed and high
revolution.  Among the ideas on rotary engines, there are some
that ignore this point.

(4)     Every component part should have the strength to endure
high speed and high pressure.  As the component parts are
exposed to high pressure, high sliding velocity and high heat
load, every part should have sufficient allowance in size and in
shape.

(5)     Sufficient cooling and lubrication should be provided.
In order to qualify as an internal combustion engine, although
this is related to above (4), durability against high heat load,
high sliding velocity, etc. are required. Therefore, the
structure should be simple, and the ideas on rotor cooling,
lubrication of seal parts, and oil seal structure should be
those that are given adequate thought.
        Also, it is desirable for a practical rotary engine to
have a simple and compact structure. When we evaluate the
various type's of rotary engines devised to date in view of the
above mentioned requirements, the NSU Wankel type rotary engine
is the engine that best satisfies the above mentioned
requirements.


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