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As the prop rotates past the cooling air intakes I
would suspect there gets to be a pressure pulse of some magnitude in the
system. I also suspect that this pulse when acting on the cowling might
contribute to the stress cracking (or spider cracking) commonly seen on higher
time installations. This is a problem on Lancairs and a lot of other
planes using fiberglass cowling.
Since I built a plennum about three years ago, my
spider cracks have stopped growing.
Mark Ravinski
N360KB 1307 hrs
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