When trying to level the longitudinal axis, I can not get it exactly the same on both sides.
I can only get one side level with the other one showing 'nose high' by 20+ th along the top of the longeron. I'm holding the level as close to the outer edges of the longeron as I can.
To measure the incidence, I'm using the level measuring from the root at 21", 71" and 125".
I can get the bubble centered at the 21" mark on the left wing. Then as I measure outwards from there, the bubble moves forward approximately 20 th at the tip, indicating that the nose is up.
On the right wing, using the same measurements, the trailing edge is high at the tip by more than 20 th.
I'm using a block for leveling that is 4 5/64".
My level is a 6" machinist's level on a 4' carpenter's level.
Cliff Jones, RV9-A incidence