Race Tech magazine published an article in the June 2009 issue
which I just received in the mail. It is more or less a clone
of my Kitplanes article.

No mention was made of the presentation I gave on turbo compound
at their MotorSport  Symposium in Nov 2008 at Oxford UK despite a picture
of me on page 25. Much of the article
was probably based on what I said then and published here on the
ACRE web site. No mention was made of heat balance and the loss of kinetic
energy across the piston engine exhaust valve. Also no mention
was made of rotary engines characteristics any kind let along the much
reduced loss of kinetic energy in the peripheral exhaust port. This is
typical of the automotive racing press as they would rather have the
rotary engine disappear. Apparently, rotaries, if not severely handicapped,
are an embarrassment to other racing engines. Well at least I now
know where the Race Tech magazine UK publishers stand.

On the other hand I am grateful for the help promoting turbo compound.

The August issue of Kitplanes beat them to the market place
by a couple of weeks not to mention the Kitplanes circulation
is ten times the circulation of Race Tech magazine here in the US.

We have been advocating turbo compound on here and elsewhere for
many years. I even pitched it to David Cole, son of Ed Cole,
ex CEO of GM back about 30 years ago. Don Sherman was my witness.
No luck :) Here are some early drawings on the subject that we
published here.

Here is an early message on the subject dating back to June 1998:

----------------------------------------------------------------------------
-------- Original Message --------
Subject: Turbo Rotary Exhaust Temps
Date: Wed, 24 Jun 1998 04:25:23 -0700
From: Paul <rotaryeng@earthlink.net>
To: junk@any

Bill Freeman wrote:

 Paul,

 So Tracy reports pretty normal temps for normally aspirated; does
 this go up dramatically for a blown engine??

It should some... according to the turbo books I just bought.
You could cool it a little and monitor it as well. Also the length of
the pipe
between the turbo and the exhaust port is going to have a very large
effect  on the TIT.


 The guy I heard this from is Tom Jordan, who says he has been in
 contact with Tracy about his project, and I just assumed that he
 was the source of the EGT info.  Any help on where he may have
 gotten this number??  I believe he will be using an intercooler,
 unlike say a T210.

 Bill



The roots blower gets ALL its HP from the crank so that is fuel down
the tubes. The turbo on the other hand gets all of its HP from what is
normally waste energy in the exhaust. Hence the engine will have much
better overall BSFC.

As you well know, if he is just looking for better MPG he could hook
the  turbine part through a gearbox to the crank without the blower and
get up to 20% more HP with no additional thermal load on the engine or
additional fuel burn. Its been done on the R-3350-TC. For those who have
not heard of it... it is called turbo compounding.

The attached photo (at 200 dots/per inch) is of a blow down turbine from
an R-3350-TC.
It is about 10 or 12 inches in dia. and it adds about 300 HP to the
R-3350-TC with no increase in fuel burn. It is one of three such on a
R-3350-TC.


Roots blowers have their place but I don't think it is on AC engines. I
would try to talk him out of it. He could blame the rotary for the
resulting high gallons per hour fuel burn. They are not real good
in that department to begin with.

Paul

-----------------------------------------------------------------


I also uploaded some videos about turbo compounding a year or so ago
on You Tube.
http://www.youtube.com/watch?v=iy_Jd5kewbM
http://www.youtube.com/watch?v=luoUHrX6DeQ
http://www.youtube.com/watch?v=emLKhfm6MWE

Paul Lamar

I just picked up a copy of Kit Plane Magazine with the turbo compound
article and am off to our local country pub for a couple of cool pints and a
good read...

Cheers,

Brian Feeney
DreamSpace Group