I took the liberty of adding a sentence or two to Kenichi
Yamamota excellent article "REQUIREMENTS FOR A PRACTICAL ROTARY
ENGINE". This point is rarely mentioned and not widely known.
Paul Lamar ...No rotor no motor.
---------------------------------------------------------
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 rotar 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.
Dear Paul,
Thank you for editing and distributing such an informative newsletter.
I would like to ask whether you (or other subscribers) know of a
reduction box which combines the output of two rotaries into one prop
shaft, while enabling individual operation / sut-down of each of the two
engines?
Thank you very much, again.
Ronen.
I don't know of one. Sounds like a fun project. Is this for an aircraft
or a boat?
Paul Lamar ...No rotor no motor.
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