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Seems to me I remember some remnant of a fragment of data from my student days
to the effect that there is a mathamatical limit to the amount of compression
achievable on a molecule of air in normally aspirated aircraft engines. As I
recall, it works out to one atmosphere (14psi) at the speed of sound. Now our
little planes do not yet approach the speed of sound, but at 200mph at sea
level,in theory one ought to be able to design a ram air system which would
give you something in excess of 3psi boost. I don't know of any instance where
this level of performance increase has been documented so perhaps it is
extremely difficult to achieve in the real world.

Any comments, real or imaginary, fact or fiction, together with design tricks,
illustrations and or photographs of neat installations would be greatly appreciated.

Angier Ames

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