Paul: Interesting ... talks a little about turbocompounding ...

 This runs about 9minutes and should be viewed on a larger (than iPhone)
 screen. Talk about pilot workload.


 Sully and Jeff fly an old Eastern Airlines DC-7. Full screen is a must!

 http://marcbrecy.perso.neuf.fr/DC7.html


 Kevin Devore

Paul,

I passed the above info on to a good friend of mine and received this
reply:

Thank you for the tape of the DC-7, that brought back memories too. I was
type rated Captain in both Constellations  and DC-7s. Another funny story
about the first time that I flew a 7. With those damn Wright turbo
compound 3350s in the B-29s, Connstellations, & DC-7s they all became the
finest 3 engine aircraft in the world-at the time.

I had to smile at his comments.

Gary Knutson

Yes I have heard that about the Connie but not the B29. It had a
straight R3350 and not the turbo compound version. Although the B29 had
its share of problems
at first.

The TC problem was; one exhaust valve would fail and take out the turbine.
Especially if the flight engineer screwed up the mixture. Then the
engine had to be shut down.

The exhaust valve absorbs a tremendous amount of energy and is the
Achilles heal of all aircraft engines.

Here is a heat balance on the subject.

This is the reason a rotary would be near twice as efficient and a lot
more dependable. No exhaust valves.

Paul Lamar

That's an interesting diagram that I hadn't seen before.  Thanks for
sending it.

Gary Knutson


This article has a lot more about that.

http://www.rotaryeng.net/sum-turbo-comp.html

And a video.

http://www.rotaryeng.net/Oxford-640-4802.wmv

Paul Lamar

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