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The 37 deg flare is suppose to put less stress on the flare than a 45 deg
flare - whether that is really the reason - I have not a clue as to why 37
is preferred for aircraft.
the story I heard was that during the war there was problems with counterfeit fittings, so the US switched to 37 degrees. other nations didn't. I have been told the is no difference in performance.
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