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

 ==============================================================

 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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 Hi Paul!: thanks for your interest, page 4 of the 1981 edition
ofthe K Yamamoto book, figs 1.17, 1.18 and 1.19, shows theMallory
Co.rotary engine, a design that looks to me close to the one by
Mr.Jean Claud Lefeuvre, it's just a development of the vane pump,
andyes, I'd said it rotates and doesn't reciprocate.
 An additional question: as you can see in the attached chart
from the 1974 book by Edward McGovern, 'The Rotary Engine
Handbook', wear of trochoid surface was greatly reduced if leaded
gas was burnt inside the Wankel RCE; as Lead acts a solid state
lubricating agent, I'm wondering if putting a Molybdenum Oil
additive in the oil that is going to be used for lubrication in
the Wankel engine would have the same action of enlarging the
lifespan of engine. I don't know it this would fool the plug, and
I have no data about the use of Molybdenum additives for 2-Stroke
engines, but in my first car, a Seat (fiat) 127, with a 903 cc (55
c.i.) 4 cylinder engine, giving47 HP (DIN) -37 kw, I added one
Molykote A can in every oil exchange,and the car ended giving 52
mpg, 4.5 lit/100 km.
 Any feedback on this would be of interest, as I've contracted
the overhaul and reparation of a 1987 13B Mazda engine for use in
my 1975 AMC Pacer X car.Best regards, salut +
    Jose Gros-Aymerich  E-28033 Madrid, Spain