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Old 16th Feb 2012, 16:21
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Lightning Mate
 
Join Date: Apr 2009
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Sorry, but boost and MAP are not the same.

MAP is the absolute pressure in the manifold, measured from zero datum ie a vacuum.

Boost is the pressure in the manifold above atmospheric.

The early systems on the Hurricane and Spifire had two blade angle settings only. The rpm in either was controlled by the throttle, unlike modern constant speed propellers.
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