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Old 02-05-2013, 05:33 AM   #12
Bob Gardner
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Join Date: Jan 2006
Location: The North of England
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Postscript; I should add that early examples were notched to form a square mortice joint but cracking started at these ninety degree angles and the idea of a mortice joint was discarded in favour of flat surfaces.

Bob Gardner
Author; WW1 British Propellers, WWI German Propellers
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