scsmith
Well Known Member
Wow, that seems like a lot of trim to me...
It is likely connected to where your c.g. is.
On my RV-8, at cruise the trim tab has very little up deflection (nose-down trim). In the pattern, it is almost all the way down (nose up trim). Next time at the hangar, I'll measure the angles for you.
But I can imagine that an RV-7 at aft c.g. might need a fair bit of up-tab (nose-down trim) at cruise. But 30 degrees seems like a lot!
One other possibility would be if the horizontal stabilizer was mounted at the wrong incidence. A small error in incidence would take a lot of trim-tab to compensate for. I would suggest you review the plans for H-tail attachment and make sure you have the right shim height under the H-tail front and/or rear spar.
It is likely connected to where your c.g. is.
On my RV-8, at cruise the trim tab has very little up deflection (nose-down trim). In the pattern, it is almost all the way down (nose up trim). Next time at the hangar, I'll measure the angles for you.
But I can imagine that an RV-7 at aft c.g. might need a fair bit of up-tab (nose-down trim) at cruise. But 30 degrees seems like a lot!
One other possibility would be if the horizontal stabilizer was mounted at the wrong incidence. A small error in incidence would take a lot of trim-tab to compensate for. I would suggest you review the plans for H-tail attachment and make sure you have the right shim height under the H-tail front and/or rear spar.