I notice what appears to be an error on the upper wing rib drawing for the S-1S. It may have been introduced when the sheet was re-drawn on 5-15-82 (see superimposed rev block). The airfoil noted is NACA 642015 while other Pitts airplanes use an NACA 63 series airfoil for the top wing. I assume it is a long standing mistake and one the factory wouldn't be concerned with since the tool numbers would be used to build the ribs, not the coordinates.
This came up while working on the rigging board update drawings and models. I made a half-sized print-out of a 63A-015 rib and it seems to closely match the drawn rib on the sheet, proving to me it's not a 64 series drawn on the sheet.
This came up while working on the rigging board update drawings and models. I made a half-sized print-out of a 63A-015 rib and it seems to closely match the drawn rib on the sheet, proving to me it's not a 64 series drawn on the sheet.
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