That was going to be my next question.... where are you going to put the extra servos? That wing is mighty thin to start with.

Instead of locking pins, how about setting up the servo to move the linkage "over center" so that airloads can't force the flap back. Also, wouldn't the airloads on the flap in the "down" position actually help it retract? Can't help thinking about the non-powered L.E. of an A-4 which simply dropped at rest.... what held that up?

Just food for thought....

Bob