Loaded the outboard spars into the fixture. Rechecked the dihedral angles and was relieved to see that I did not mess up the angles by building each spar seperately. When the center spar is leveled, the dihedral at the tips was within 0.05 inches from left to right. Next I built some wingtip (BL:122.5) ribs and started to set up the washout. A word on washout...there is conflicting data. The plans say the design incorporates 1.5 degrees of washout (although one of the drawings says 1.125 degrees). This is supposed to be accomplished by setting the inboard rib to 1 degree incidence, and the tip rib to zero degrees. This would only yeild 1 degree of washout unless the chord lines drawn on the ribs are not really chord lines. Looking only at ribs 39.5 through 122.5, the lines drawn on the BP appear to be chord lines (altering the 122.5 rib line by 0.5 degrees would not be reasonable for a chord line) (note: ribs inboard of 39.5 are unusual profiles as needed to intersect the glove to the bottom of the fuselage so the "level lines" drawn are unique). If there is truly a mistake in this area, I do not want to have a laminar flow tapered wing with only 1 degree of washout. Typically 2 - 2.5 degrees is more common (although the two Riblett profiles chosen may help) As a result, I choose to add 1/2 degree nose down on the tip rib. If I am wrong in interpreting the drawings, then my plane will have 2 degrees of washout and still should be acceptable. To set the angle, Image 3 shows the tools I used to get the angle correct. The left and right wing tools were drilled together so that I am sure each wing has exactly the same twist.
