George Lendich wrote:

Mark,
There are some considering the 13b, (such as myself) however the stumbling
block  is the 300 lb limit on the motor (up front) weight.

Bill,
An old friend of mine (a mechanical engineer) has been developing the engine
of
your dreams (and his, and mine) for the last 25 yrs -3,000 rpm (max),
rotary (about 12"x 12" ) gives 85 hp (approx) with an 18" x18" giving 200hp.
This is on paper and is in the throws of getting built, I ring him every
week to keep
him motivated, he won't outsourse the making of the parts for fear of
someone
finding out his secrets - apparantly it's very simple.

Paul,
He did however say it needed valves - can't win them all !!

HMMM.   A rotary with valves?   I assume that this means that it is some
other type of rotary engine, not a Wankel design.   I wish him luck,
a lot of interesting ideas have had a great deal of trouble making the leap
from paper to steel and aluminum.  Even the Wankel, as good as it is,
has had a lot of trouble reaching production.

Bill
Long EZ builder & pilot
BSME, MSME

Amen to that. Here is Kenichi Yamamoto criteria for a true rotary.

Paul Lamar

Lets try that again. I corrected some of the OCR errors.

Paul Lamar
 
The AirCraft Rotary Engine NewsLetter.              Powered by Linux.

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1.3	REQUIREMEMS FOR A
PRACTICAL ROTARY ENGINE
	Although various types of rotary engines have
been deve1oped to date, there are few that do not qualify
as internal combustk)n 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 quali-
fled 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 movilig 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.
Accordingly, structures that require intake and ex-
haust valves and mechanisms using the rotors Os-
cillatory 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 cx
        haust 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 str-
ength to endure high speed and high pres-
sure.
		As the component parts are exposed to hi-
gh 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 combus-
tion engine, although this is related to above (4),
durability against high heat load, high sliding ve-
locity, etc. are required. Therefore, the structure
should be simple, and the ideas on rotor cooling,
lubrication of seal parts, and oil seal structure shou-
ld 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 typt'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
satisfles the above mentioned requirements.
	The NSU Wanke1 type rotary engine will simply
he called a rotary engian, and the reciprocating piston
engine will he called  a reciprocating  engine  herein
after.