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)


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