On Wed, 28 Apr 2004 12:26:42 +0100, David wrote in message 
<[EMAIL PROTECTED]>:

> 
> 
> On 4/19/04 at 11:12 PM Vivian Meazza wrote:
> >All you ever wanted to know about a Merlin with 2 speed, 2 stage
> >supercharging is here:
> >
> >http://www.unlimitedexcitement.com/Pride%20of%20Pay%20n%20Pak/Rolls-
> >Royce%2
> 0
> >Merlin%20V-1650%20Engine.htm
> >
> >Except exactly how the boost contol valve worked :-)
> >
> 
> Nice link!
> 
> I've found a reference describing the BCV mechanism ("Thrust for
> Flight" by W. Thomson), apparently it consisted of a stack of metal
> aneroids that contract under increased pressure.  This makes perfect
> sense - it would measure absolute pressure, and I believe is similar
> to the mechanism used in many barometers.

..search these for "aneroid".
http://naca.larc.nasa.gov/index.cgi?method=search&limit=25&offset=0&mode=simple&order=DESC&keywords=supercharger+stage
http://www.cebudanderson.com/viewfromtheline.htm
http://www.dallasjournal.com/articlesview.php?ID=295
http://www.aircadets.org/pdf/acp33vol3.pdf
http://www.unlimitedexcitement.com/Griffon Budweiser/Rolls-Royce Griffon
Engine.htm
http://www.home.aone.net.au/shack_one/rolls.htm

-- 
..med vennlig hilsen = with Kind Regards from Arnt... ;-)
...with a number of polar bear hunters in his ancestry...
  Scenarios always come in sets of three: 
  best case, worst case, and just in case.



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