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Old Jan 13, 2012, 02:18 AM
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Pacific Northwest
Joined Jan 2009
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During wing construction I came across a couple of minor discrepancies. The first one is where the spar taper start point is called out. The plans show the taper beginning after rib R4 for front and rear spars when the ribs are slotted to fit so the fore spar taper begins outboard of R6 and the rear spar at outboard of R5. The other is regarding the rib profile of the tip ribs. I have included a photo that shows rib R7 matching the height of R5, R4, etc. while R6 is narrower by 1/8" at the top. It appears that R6 introduces a taper (reduced camber along the top) to the tip that R7 never got. If the top of the wing is to remain constant then R6 needs to be taller, if there should be a taper then R7 needs less top camber (3-4mm). I'm going to go ahead and sand R7 down to create the taper on this one unless you say otherwise.

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