Hey guys here comes your dream 55 HP one rotor motor.
Can a two rotor be far behind? I am so happy to see they
have come around to selling this great little engine.
Thank you Chris Dries.

http://www.austroengine.at/products/rotary-engines/rotary-engines.html

"Since launching our first line of products, the AE50R series, our 50 horsepower
rotary engine product,has built a successful track record, with more than 700
installations in motor gliders and cam copters of leading OEMs. Our rotary
engines are small, lightweight, and have an outstanding low vibration.

Their reliability and adaptability enabled the development of a larger, stronger
rotary engine, the IAE75R, which will soon be available."

--------------------------------------------
To: Engineering at Austro Engines.
Dear Sir or Madam,

Try a longer intake manifold.

Paul Lamar

Chris,

Have  you contacted Austro for a _price_ on the engine (+PSRU?)?  I
surfed around their site using Bable Fish translation but found no
pricing data.  Apparently you have to ask Sales for a quote.  The weight
looks good and their story of test cell runs on all the engines sounds
good.

BTW, their graph of KW vs. RPM is goofy.  If the KW(HP) is circa 40.2 KW
at 7200, and the torque is still going up like it shows, there is no way
the KW(HP) gets truncated to a flat limit from 7200 to 7800 rpm.  It
must continue to go up also.

Joe

You are quite right Joe. I noticed that too. The torque shows still
going up and up, not likely at 7800 rpm, or if so, the power must rise too.
Does this mean we cant trust the data? It is the same old 294 cc charge
cooled engine with an added compressor.

Rolf

No compressor. That is a rotor cooling blower.
The rotor is pure air cooled and not charge cooled.
Cooling air comes in around the base of the rotor in
a part of the end housing that is not contacted by
the side seals.

The porting is straight p-port. The reason the torque is still
going up at 7800 RPM is because of the shortness of the intake
manifold. With that short of a manifold the engine is probably tuned
for over 12,000 RPM. I am guessing. With a 24 inch manifold torque
peak would be closer to 6,000 RPM and there would be more HP
at 7800 RPM. I am not guessing :)

I think there is a thermal limit on the HP and that
is why the HP curve is truncated.

IMHO an oil cooled rotor would probably solve that problem
and improve the BSFC as that cooling blower consumes HP from
the e-shaft.

Paul Lamar

Looking at the pictures I sure agree. Peripheral inlet and outlet.
Yes, that belt driven blower is to cool the rotor only. That is another
way of cooling it. Not bad.
The air goes in one side wall and comes out the other.

I also noticed the rather large bores for the spark plug that seems
close to the tap diameter of the plug thread.
That surely must improve ignition of the charge. I likewise would assume
the reason for two plugs is dual ignition for safety. If one fails there
is no change in timing and power loss would be minimal, comparable to
the Recips.
The fear against large diameter spark plug bores is / was a loss of
power when the seals pass over it. This is less of a concern at high speed.
Also, the location of the plugs is close to the hump in the trochoide,
sort of in between the conventional leading and trailing plugs.

This design seems to have a lot of new, good features.
I learned something here. I was not aware of these details.

Rolf