I am reading a book in my spare time written by Sir Stanley Hooker.
   Hooker redesigned the Merlin super charger making it better than the
   Allison. The fuel burn was listed in the book as 10.5 HP in 1939 for
every
   pound of fuel/air consumed. To convert that to the poplar BSFC number
   works out at stoichiometric of 14.6  pounds of air and 1 pound of fuel
   means one must divide 10.5 HP by 15.6 I think.

   That gives a BSFC of .67. Pounds of fuel burned per HP generated per
hour.
   Not that great by todays standards.

   If it were leaned to 16:1 the number would be .61.
   The current rotary is .47 pounds of fuel burned per HP generated.

   Check my arithmetic.

   Paul Lamar


Paul,

It did the trick, and that's all that counts :-}
I pass the Old Spitfire Factory ( Now Jaguar cars) every day going to work,
and I always spare a thought for the Men and Women that worked in the war
factories, another good book that you should read is Alex Henshaw  book
depicting his time at Castle Bromwich Aerodrome, it sights technical issues
ranging from Sabotage to Quality failings, that caused him to conduct forced
landings.

http://en.wikipedia.org/wiki/Alex_Henshaw

The sculpture below is outside the factory on a road traffic Island
http://en.wikipedia.org/wiki/Sentinel_(sculpture)

Bob Rowley
UK

Hooker's book has a lot of good design tips on engines.
Great book.

Paul Lamar


Paul, Yes. I have that book,
Being on the fringe of the old British aircraft industry, I met a lot of
engineers,
that work on RR and RB211. Our chairman was Jeffrey fawn, and he worked
under
Jeffery quill, or said that he did.
Bob

I got a lot of respect for brit engineers.
That is why most of the Form 1 people are brits.

After all Newton was a brit :)

Paul Lamar

  Regarding these old engines and devices, you may know that there's nothing like AEHS
(Aircraft Engine Historical Society)     www.enginehistory.org  membership is just $12 a
year, but   a lot of their info is of open access, and there are very highly skilled,
cooperative, kind and well trained people in aircraft engines there.Enjoy it!          Salut †
   Jose Gros-Aymerich     Madrid, Spain