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Serenity
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Date: 8-28-2008
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Number of Hours: 3.00
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Manual Reference:
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Brief Description: Setting Wing Incidence
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Today 2 important things were accomplished - setting the wing sweep (how perpendicular the wing is to the fuselage) and the incidence (the angle of the wing when viewed from the side). There is a little play with the main spar bolted, but only 1/4" or so in all directions. First step is to level the fuselage fore/aft and side to side. Then, for th esetting the sweep, I dropped plumb lines from fuse front and rear centers, then with a chalk line and laser put down a line. The I ran a perpendicular line along the leading edge of the wing using a laser 90 degree tool and by measuring a large Pythagorean 3/4/5 triangle to verify. I then dropped more plumb lines from the wing, and clamped the rear spar attachment to hold everything. It so happened that the wing was 1/8" off only. For the incidence, I cut out a predetermined length block per Van's instructions, layed a level on the block at the rear spar and the front of the level rested on the front spar point of the wing. I used the electronic level to adjust the rear spar attachment up and down slightly until all was zero degrees. After rechecking this and the sweep about 4 times, I drilled the wing to fuse rear spar attachment in 3 steps - #30, #21, 5/16" final. Edge distances were verified before drilling - had more than the required 5/8". Nerve racking, but relatively easy. Now the wing is locked in position. The only bad news - when I checked the incidence along the wing, my wing tips were 0.2 degrees off - front of wing was higher. This is not enough to quite see on a bubble level. Not a big deal, but cheeses me a little as I triple checked it when I built the wing to ensure no twist.
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Plumb from the outer wing fell perfectly on the 90 degree line
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Incidence being set - 0 degrees achieved
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After sweep and incidence set, this 1 5/16" bolt hole was drilled and locks everything at rear spar
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