Hi!: did I tell you about this Non-Wankel Rotary Combustion
Engine that provedbeing a sound design, as it works
perfectly?Enjoy it, salut +
    Jose Gros-Aymerich  E-28033 Madrid, Spain
http://www.youtube.com/watch?v=sKrWB3aJeaU


Not a rotary engine. The blades reciprocate.

Paul Lamar

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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 rotor 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
dimension-ally reliable.  The gas seal mechanism of a rotary
engine should be constituted by connecting the individual seals
three dimension-ally. 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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This would not function as well as the Wankel as I see it.  The
sealing blades would have to travel, and sealing could be
compromised while doing so.  As the blades have to extend out of
the groove rather substantially, it not only have to deal with
the bending stress but also the reciprocating movement.
GAO, Gordon