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.
Cheers - Dave
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