Model B Aileron Rib Length Discrepancy

Weldingiron

Weldingiron

Well-known member
After finding out this evening that all of my aileron ribs were destined for the scrap pile because of a lightening hole misplacement, I discovered that the aileron rib on the Mylar drawing (where I built the master and subsequent form blocks from) is an inch shorter than the aileron rib depicted on page 9B of the plans (where I took lightening hole diameters and center points from). Has anyone else had this issue, or is it possible that I got the Mylar drawing for a different model? I would guess this is something I need to talk to Bob about but wanted to reach out before bothering him again. Thanks!
 
I wouldn't worry about bothering Bob, it's his job, and your his customer. Before calling Bob, review the drawings carefully, make sure you have not missed anything. More then once I thought I found an error on a drawing sheet only to be proven wrong upon further review. As for rhe scrap pile, it takes a commitment to excellence to build a big ass scrap pile. Be proud of it.
Gerry
Patrol #30
 
I'm guessing the mylar shows the finished profile but the plans drawing includes the material for the flanges - hence the extra inch .....
 
My aileron ribs measure about 13 inches along the chord line which matches the measurement I get from page 9b of 6.5 inches. I have plans 1444b. The trailing edge shown on the drawing adds about an inch of length.
 
Looking again, I see I was measuring the trailing edge as part of the rib on Page 9. So that explains the length discrepancy. Now, I'm back to square 1 trying to figure out what isn't adding up with the placement of the lightening hole...
 
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