Rough River 2010 notes on long wing spar strengthening.
Date: 09/21/2010
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Date: 08/23/2023
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Stern install 5.
Extra holes above middle horizontal rib was where the rib fit well, but was bulging the fin.
Fitting ribs to where they fit best and not bulge, then mutilating and laying up 3 BID on front and rear flange as needed works great.
Y9-05-08