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Steve's CH750 Cruzer (N750SB)
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Date:  12-1-2017
Number of Hours:  4.75
Manual Reference:  
Brief Description:  Positioning for tolerances

Since the right wing was already on the bench risers, I reattached it first at the forward attach point, got the rear spar roughly into position. With the attach bolt inserted forward, and supported by the outboard bench riser, I moved the inboard riser to the left side of the plane. Hoisted the left wing into place and inserted the forward bolt. Moved the bench riser support into place and released tension on the hoist. For the 1st time, both wings were (loosly) attached to the fuselage.

Drilled out the outboard most spar rivet on each side and tied some old fishing string to a cleco on one side and just wrapped it on the other so I could adjust tension. Adjusted the riser supports to roughly get the 85mm dihedral at the root ribs. Drilled a hole in a freebie harbor freight tape measure to allow it to be cleco'd in place on the wing. Stretched the tape back to the front center of the vertical fin to get equal measurements on both sides. Amazingly, it was spot on the first time. From then on, it was just a series of minute adjustments, measure, and readjust iterations to get the angularity, perpendicularity, dihedral, and incidence all in spec. I may not have the full 3 degrees of incidence, but from reading the blogs it sounds like anything close is acceptable.

My concern is going to be the attachment of the rear spar. It doesn't look like there is a lot of "bite" on the spar for the fuselage mounting tab which will meet edge clearance specs. Leaving that for next time.

Note from future self: Support the wing as close to the attach point as possible. After drilling and removing the supports which were positioned fairly far outboard, the change in support to the strut attach point caused the ends to "droop" a bit and dihedral went from the prescribed 85mm to 75mm.
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Outboard spar reference point

Outboard spar reference point

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Wings aligned

Wings aligned

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