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Subject: RE: [FlyRotary] Re: engine exhaust
Date: Fri, 27 Jan 2012 11:26:34 -0600
Message-ID: <1F44A251F397E444B05E240B8688AB790BDF8F6F@DALEXC100P.PROD.FDIC.GOV>
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Thread-Topic: [FlyRotary] Re: engine exhaust
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From: "Rogers, Bob J." <BRogers@FDIC.gov>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>

If you add another turbo to capture the remaining exhaust gas, the
compressor portion will generate compressed air, which can be directed
to flow over an oil cooler or a radiator, but the air will be much
hotter than the outside air available for cooling.  When the air is
compressed, it is heated by as much as 100 degrees.  The temperature
rise is a function of the amount of compression.  That is why you need
an intercooler before such air is routed to an engine intake for
combustion.  I doubt that the air from a compressor stage of the turbo
would be cool enough to help reduce the water or oil temperature very
much (if at all) and the volume of air would not be significant compared
to the volume of air available in the free stream of outside air.  Plus
you have the added weight of the turbo to deal with.  In short, it would
not work. =20

Bob Rogers
Mustang II, powered by Rotary 13B Turbo

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Ernest Christley
Sent: Friday, January 27, 2012 11:09 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: engine exhaust

Mark McClure wrote:
>
> The 13b MSP is putting out exhaust temps of 1600F. So using the same
principles in reverse, the remaining energy powers a compressor (turbo)
and that air is then used to assist in the cooling.=20
>
> So the question is: What have I oversimplified?
>
> Mark
>
>  =20
There is so much about the rotary that is completely unexplored.  An
option that I'm investigating with my installation is to have a blower
attached to the shaft between the engine and PSRU.  The goals are:
- to make more of the propeller efficient by removing the high pressure
area from between it and the cowling
- remove that high pressure area at the nose and
- use it to increase manifold pressure
- increase the manifold pressure
- in a extremely simple and lightweight method.

I've seen the videos of people making jets out of turbos.  I've not run
a single number, but it seems like it would be possible to duct the
output of a really thick radiator to the input of a large turbo.  The
pressurized air would cool the turbo and get heated in return, then
combined with the exhaust to produce thrust.  I do seem to remember
someone on this list doing an analysis and coming to the conclusion that
a "rotary jet" was not viable, but if you're getting a list of drag
reducing benefits, dealing with the exhaust (one of the worst pain
points we've had to deal with),  AND getting some measurable thrust ...
you'll get listed as a hairy chested hero.

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