On the top wing of my GP trainer forty .. when i have the plane laying flat on the floor how important is it that
the trailing edge of the plane be 1/32 lower than the leading edge? what if it is more or less ?

If it's close it will be fine. The only thing is the ELEV trim may change with the throttle setting. It's not a big deal. I hope you have some one to teach you on a buddy box. If not at least get some one to trim it out for you.


David

I think yours is more a question of Angle Of Attack (AOA) rather than Incidence. As long as the wing is close to level, you'll be fine.

I won't get into the sordid details, but some say the wing should sit with a slight negative AOA. Your manual (And I) believe it should sit with a slight Positive AOA.

Bottom line... Don't lose any sleep over it.