Dannost,

A couple of warnings... this plane is some 20+ years old, so we used "old technology" for the fowlers. It's a "design" that my father came up with on our first Royal P-38, which was close to 30 years ago. What we did was install three 90 degree bellcranks on each flap. One for each end of the flap (where you have the carbon tubes) and one in the middle of the flap which protrudes very slightly below the bottom of the wing at the TE (LE of the flap itself). We tied all the bellcranks together, and set the throws up so that the middle bellcrank didn't move quite as much as the outer two bellcranks (moved the connecting rod in one hole). So, the two outer bellcranks move slightly more than the middle bellcrank. Since that middle bellcrank attaches to the flap just below the wing surface, it acts to "pull" (or rotate) that part of the flap LE inward slightly.

I'm not sure if that explaination is clear enough... think of it this way... where you have a pushrod that pushes the flap back... we have two. One on each corner of the flap LE (and they slide in a track). Where you have one pushrod that acts to rotate the LE of the flap, we have one too (but it connects to a bellcrank, not a servo arm). Is that a better explaination?? I think this design causes a little binding through the middle of the motion, but it's not too bad. Where we get a little slop is just in the connection of the middle pushrod (it's hole has been enlarged over time). I could try to make a drawing, if it would help. It was a neat design 30 years ago (but heavy... we have a total of 14 bellcranks in the wing, including the ones for the ailerons). However, we drive all the flaps with one servo.