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Engine Mount Bolt Size

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Chuck

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I was pondering....

What analysis was done to require the difference in the bolt size between the fuselage and the engine mount for the 360 or 540 engines? I understand it "feels better" but is there any specific justification?

On a side note, I understand the Pitts S2B/S2C use 3/8 bolts? Please correct me if I am wrong.

Chuck
 

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