'Thought it was 4 rows of 7 cyl each for total of 28. 'Seemed that one
could hear unmistakably a KC-97, C-124 (4 R-4360's) or a B-36 (6 R-4360's)
and others with these engines coming from about 50 miles away, and it took
seemingly a half day for them to pass overhead and the rest of the day for
them to pass out of earshot. ;<)
Wilton
----- Original Message -----
From: "G Mann" <g2ma...@gmail.com>
To: "Mercedes Discussion List" <mercedes@okiebenz.com>
Sent: Thursday, April 19, 2012 10:59 AM
Subject: Re: [MBZ] Diesel or Gas?
Yes, the R-4360 is a "turbo compound" engine, with 4 rows of 9 cylinder
radial engines stacked to make a very complicated engine. [two spark plugs
per cylinder X 36 cylinders]
The engine gear driven supercharger is "compounded" by turbocharger
extracting energy from waste exhaust gas to compress air, to feed the
supercharger and more dense air charge load for further compression prior
to insertion into the combustion chambers. "Mui Complicado" The recovery
of exhaust energy accounted for about another 400 HP through the
turbocharger.
The R-4360 was the last of the piston radials and was replaced by Jet
engines. There are very few mechanical geniuses left who know how to work
on one at this time. The R-4360 ran on 120/140 octane fuel [dyed purple]
which is no longer made. [to bad, it made great fuel for my Sat night drag
racing cars, back in the day] and each engine had a 50 gallon oil sump
which used 90 wt. oil [as I recall] straight weight, no multi-grade in
those days.
Common wisdom of the day was the engines use mist lubrication.. they blew
out a mist of oil and you flew through it..... about 6 to 8 gallons per
hour oil usage was "normal"... more than that and you started chasing
problems.. Put 4 of these engines on the airplanes that used them and you
needed some "real mechanics" not parts replacers..
All FWIW...
Grant... Who touched one once and is still trying to get the oil stains
off.
On Thu, Apr 19, 2012 at 7:28 AM, Rich Thomas <
richthomas79td...@constructivity.net> wrote:
Weren't some of those also compound turbo/super chargers -- an exhaust
driven turbocharger pushing air into an engine-driven supercharger to get
even more pressure at higher altitudes? I vaguely recall seeing
something
like that, maybe on the B-36? This entry does not specifically address
engine config, but to run a piston engine at 50ft would require some
serious pumping.
http://en.wikipedia.org/wiki/**Convair_B-36<http://en.wikipedia.org/wiki/Convair_B-36>
Hard to see in these pics
www.ellsworth.af.mil/shared/**media/document/AFD-070131-112.**pdf<http://www.ellsworth.af.mil/shared/media/document/AFD-070131-112.pdf>
This says it was a mechanical supercharger
http://en.wikipedia.org/wiki/**Pratt_%26_Whitney_R-4360_Wasp_**Major<http://en.wikipedia.org/wiki/Pratt_%26_Whitney_R-4360_Wasp_Major>but I
do recall seeing compound engines. more info but not a compound?
http://en.wikipedia.org/wiki/**Allison_V-1710<http://en.wikipedia.org/wiki/Allison_V-1710>
--R
On 4/19/12 10:08 AM, Dieselhead wrote:
If you go back and read aircraft literature from the 40s, you will see
the equipment referred to turbosupercharger. in the postwar era, the
"super" and or the "supercharger" parts of the word were commonly
dropped
in common use.
I am sure the guys on the line in the war dropped the "supercharger"
also.
> Brian Toscano wrote:
I have never heard of a turbo-supercharger except here.
From
http://en.wikipedia.org/wiki/**Supercharger<http://en.wikipedia.org/wiki/Supercharger>
When power comes from an exhaust gas turbine a supercharger is
known as a turbosupercharger - typically referred to simply
as a turbocharger or just turbo.
No, I did not just edit it. *grin*
Superchargers are driven by the flywheel.
Usually it's not at the flywheel, but yes, they are drive by
the crankshaft. Accessory belt on the front is the most
common, though there are some chain or gear-driven ones.
Turbos are driven by the exhaust.
Correct.
Looking at the word itself, "supercharger" means a super
charge of air going into the engine. Technically this could
be from ram air as well as a mechanical device. The turbo is
an turbine in the exhaust that drives the supercharging
centrifugal compressor.
To be fair, in the wikipedia article, the very next sentence
is "Common usage restricts the term supercharger to
mechanically driven units."
-- Philip
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