Hi Paul,

As far as I know, Rotamax rotary engines do not have any oil sump,
they work with oil direct injection. In your opinion, is that a good
 thing or not? Would you recommend oil sump or oil direct injection?
I am looking to get 350 Hp out of a 2 Rotor engine, in all aluminum.

please see following picture of a Rotamax engine.

http://www.indysportaviation.com/Oshkosh2008/rotamax120hp.html


Thank you Andy Mangold

It is called charge cooling and it is inadequate for an aircraft
engine called on the generate over 50% power for long periods of
time.

You will need a high pressure oil system with oil cooled rotors. In
other words a Mazda.

Paul Lamar

Paul, Thank you very much for the info. I am planing to run the two
engines only on 50%, even for take off. Only in case of emergency,
when one engine is failing, the remaining engine has to go up to
100, but only for about 5 minutes. In a case like that, would you say
it is OK?

Andy Mangold

Good luck. Might work.

The rubber coupling they used also failed causing a crash.

Paul Lamar


The charge cooled rotary engine and the 2 stroke piston ignition
engine seem to suffer the same defects : - low fuel efficiency, -
large amount of oil in exhaust gas, - not suitable for high charge
base load operation. - not suitable for turbocharging (and
turbocompounding, of course)

and also share some good points : - simpler and lighter than their
counterparts, - automatically lubricated in any position.

So they are suitable for the same applications that require low
power for limited time and high peak power to weight ratio as RC
models, chainsaws,...

Philippe Dejean (France)


Guys. thanks for all the info.

Does anyone know the weight difference between an all aluminum two rotor
engine and a engine with iron cast side housings?

Also does anyone know if I can mount the two rotor engine just on the Bell
Housing?

Andy Mangold

The bare cast iron Mazda weighs 190 pounds.
The bare all aluminium Mazda weighs about 110 pounds.

It is possible to mount it with the bell housing but probably
would require some tig welding on the bell housing. Send
me a sketch of what you have in mind.

Do you have a gear box?

Paul Lamar



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