Paul
   I ran across this patent "Internal combustion engine with compounded
air compression"
what caught my eye was the application of the idea to a rotary engine in
Fig 3.  in the patent they are using a turbo charger and a rotary
compressor which is mechanically linked to the rotary engine.  Very
interesting and maybe a good approach as maybe the smaller rotary
compressor could be directly linked to the main engine and therefore no
need for a clutch assembly?  Anyway, wanted to see what you thought.

Mike C.

Looks interesting but I don't see how we can use it in an aircraft.
As a compressor it will suck more HP than a turbo charger.

Paul Lamar
--

I agree with that but I think the claim was that

"unexpected results were obtained when both sides of the rotary
Wankel-type unit were used as a compressor and driven by power from the
engine shaft.  At lower speeds of operation, the turbocharger delivers
no compression and all of the compression is provided by the rotary
compressor operating as a blower.  At mid-range speeds both turbocharger
and the rotary compressor contributed and develop an enormous
compression.  At High speeds, the turbocharger develops sufficient
compressed air to not only power the engine, but drive the rotary
compressor which operates as an air motor."

It was the last sentence that got me thinking about direct coupled
rotary compressors to the e-shaft with a set up like this.  Since we
operate mostly at higher speeds... do you think there is anything to this?

Mike C

I don't really know. I think it would need to be built to test it.


Paul Lamar

If I understood this right, on high speed, the rotary compressor acts as
a pneumatic turbo-compound transmission, fed by turbocharger turbine.

Direct coupling with friction planetary and proper impulse turbine
should yield better results on exhaust energy recovery. Interesting
note, though!

Cheers,
Petri