Changing Elevator Incidence
We had a problem with the FSII wanting
to act tail heavy, even though it wasn't. We trimmed out the tail
heaviness by drooping the ailerons.
(If a Kolb feels nose heavy, even when
it isn't, adjust the pushrods to raise the trailing edges of the
ailerons or flaps until it trims normal. If it acts tail heavy
even when it isn't, lower the trailing edges of the ailerons or
flaps. You move the center of lift forward or aft on the wing
when you do this)
However, in order to get it trimmed
correctly, it required so much aileron droop that the ailerons
felt heavy, which made sense, because now they were always hanging
down into the airflow, and under load. So we decided to try raising
the front of the stabilizer a little.
Nothing fancy, a length of .080 x 3/4"
steel strap, cut out four brackets, and drilled three 3/16"
holes in each bracket.
The middle hole in the new brackets
is used to bolt the new brackets to the original equipment welded
bracket through the original hole in the original bracket, the
one used for the stabilizer bolt. Fill the inside space tightly
with washers or a spacer bushing so that you can tighten it properly
without deforming the original bracket. Then you drill a hole
through the original bracket and put another AN3 bolt through
the bottom to keep the new brackets from twisting or moving.
The final AN3 bolt goes through the
top hole which is above the original hole. You have now raised
the front of the elevator a bit and you ought to be good to go.
Note that it would be easy to put extra upper holes in the new
brackets so that you could test fly & adjust to find the optimum
location. We went about 7/8 of an inch up and got lucky. Your
results may vary...