QB fuselage. I have it leveled laterally and longitudinally. After a ton of measuring I discovered the fus has about a 1 degree twist built in to it. With the wing spar level the aft deck is about a 1/8 bubble out. Initial fit up of the horizontal stab requires an additional .120" shim on the left side (in addition to the .125" spacer) in order to get the Horizontal stab level to match the wing spar. I can shoot a laser through all the holes in flight control attach points on the horizontal stab so I feel it is pretty straight and not the culprit.
Here is how I did it. Tell me if I am doing something wrong.
1. Level laid across the main wing spar at the front seat crotch belt. Shows laterally level.
2. Second level on the 819 aft deck shows longitudinally level.
3. Turn the level on the aft deck to measure laterally and it shows slightly out.
4. Place and clamp the horizontal stab per the instructions with the .125" spacers in position.
5. 2 small blocks of wood on the horizontal stab equidistant from the centerline and along a rivet line with a 3' level laid on them shows essentially same error as the aft deck.
What I did next.
1. Quadruple check level. Confirmed.
2. Swap positions of all levels. Same readings.
3. Put a digital level on everything. Pretty much the same readings as the bubble levels.
Has anybody else had to put that much shim on the stab? What awaits me further in the build? Searching reveals a couple other threads about this but none with this much shim required. Thoughts?
Here is how I did it. Tell me if I am doing something wrong.
1. Level laid across the main wing spar at the front seat crotch belt. Shows laterally level.
2. Second level on the 819 aft deck shows longitudinally level.
3. Turn the level on the aft deck to measure laterally and it shows slightly out.
4. Place and clamp the horizontal stab per the instructions with the .125" spacers in position.
5. 2 small blocks of wood on the horizontal stab equidistant from the centerline and along a rivet line with a 3' level laid on them shows essentially same error as the aft deck.
What I did next.
1. Quadruple check level. Confirmed.
2. Swap positions of all levels. Same readings.
3. Put a digital level on everything. Pretty much the same readings as the bubble levels.
Has anybody else had to put that much shim on the stab? What awaits me further in the build? Searching reveals a couple other threads about this but none with this much shim required. Thoughts?