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Grayhawk noted the flap's effect on pitch trip.
Lowering the flaps pitches the nose down.
> The disadvantage is in a go-around and the tremendous pitching
> moment the flaps create - the plane will be dramatically out of
> trim until the pilot starts chasing the pitch change.
I followed a suggestion from Paul Lipps and installed a spring
connecting the flap actuator to the elevator pushrod. In the
235 airframe this is easy because the flap actuator lies alongside
the elevator pushrod. In a 320/360, the installation would be
a little more complex.
Before the modification, I never had quite enough range of
pitch trim. Now I only use about 1 inch of the 4 inch travel
on the trim handle. It only took a couple of test flights to
tune the spring constant and preload to where I can comfortably
fly from 60 kias with flaps down to 200 kias with flap ups and
no trim change. That last inch of adjustment is still needed
to compensate for CG changes and power settings.
I don't have a photo of mine handy, so I'm taking the liberty
of posting Paul's photo (cropped and recompressed) which
looks almost identical. L235 builders should recognize this
view inside the armrest. Aft is on the right.
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Flap-Elevator_linkage02_Lipps.jpg
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