One other thought, any changes in spar thickness, longer main spar bolts, or changes to brackets may interfere with the insertion of the outer two main wing spar bolts, particularly the top bolt. It was a tight fit on the original design with the anterior cabin width narrowing in the front and the seat panel 6-B-15-4 sloping in from the rear.
On drawing 6-ZU-2 showing the carry thru spar riveted to cabin floor with doubler it shows the front row of rivets thru existing holes and new rear holes shouldn't this be backwards as the rear upright is not moved but the forward upright will move forward making the existing holes in the floor not usable along the forward 6-ZU-2-7 or am I seeing this wrong. David
David, according to the note on 6-ZU-2, the front bottom flange of 6W4-1 is cut off and replaced by 6-ZU-2-7 then when the doubler 6-ZU-2-9 is installed the rivets will go through the doubler, the existing floor holes then through the new front bottom angle. The holes in the new bottom angle will be .125" closer to the radius, but that should not hurt. By the way, you have a beautiful airplane, bet it made you sick to tear it apart for this important modification,
Mathieu, if you read this, could you place on the drawing or tell us what the reamed diameter of the spar bolt holes should be. I would like to clean mine up, but do not want to go too large.
I concur with the removal of the center spar. Today I removed my center spar out of my plans build partially completed 601xl fuselage, and I also had to remove one of the rear center spar uprights to allow for the center spar to be moved out of the fuselage.
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