>Does someone out there have a copy of Foa's book? I wanted to study the sketch of the Logan pulsejet,
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There's nothing to study. Foa gives no details. It's just a thin fuel supply tube passing coaxially through a broader air intake tube and ending where the air tube enters the chamber, presumably in a kind of a jet, though it is neither specified nor shown on the diagram.
BTW, the guy is almost certainly of Italian extraction, which would make the proper pronounciation of his name 'foe-ah'.