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S1-S Lower Rear Spar Thickness Change

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cwilliamrose

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I should probably know the history of this but I don't. On the factory plans the lower rear spar is 7/8" thick but it is thinned to 11/16" thick at the root where the doublers and fittings attach. My guess is this allowed the 'new' symmetrical wings to fit existing fuselages and would have been left at 7/8" thick if not for this consideration. Does anyone remember this detail's history?

Pitts Lwr Rear Spar Jog.jpg
 

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