I must be totally missing it, but I can't find the spec for the lightening hole flanges on the .025 nose and center ribs on Patrol Drawing No. 3. On my LSA plans, it's clearly called out "Flange 3/8 x 30°".
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Patrol .025 Rib Lightening Hole Flanges
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Papa,
What is your ser# and revision date. The revision date is probably the difference. I think the 10-6-2000 is when he first drew them up and are the same for all. My ser# is 254 and rev is 10-11-08 on that page and it looks just like X'N's.
DRLPatrolScratch building Patrol #254
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Plans updated in 2008 with the 'Flange 3/8 x 030 deg .025 ribs only (six places)'. Lightening holes are A-F, with A-D on main ribs (fwd to aft) and E and F on nose ribs (fwd to aft). A-F = six letters = six places. The screenshot below gives chamfer info from the wing rib forming doc found elsewhere on the site. The indicated chamfer width on the block produces the 3/8" and 1/4" nominal width lightening flange.Last edited by SpruceForest; 09-09-2025, 10:08 AM.
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