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just an note on the American eagle engines. the crankshafts on these engines
are listed as having a tensile strength in the 270,00 psi range. this figure
is well into the notch sensitivity (brittle) range. It would be interesting
to find out why they were tempered so high.

I know grade 8 bolts are not allowed in aircraft for the same reason, they
are too brittle. 125-150 ski alloy steel is typically what is used for high
strength aircraft bolts. something worth asking about I wonder.

Scott

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