RE: topflite spitfire retracts
Hi
Good question.
Yes it will work.
I have a 48" span 109 with mechanical retracts. Same problem and idea as the spit.
What worked for me is an old single S-8 Futaba servo, 180 degree sweep, (like todays strong retract servos) really slow movement and a combination of piano wire and goldenrod.
For gear up, the wire and cable are pulled, so not much of a concern about the cable. Support the cable as needed.
For down, once the "lock up" is released, the gear just drop from there own weight.
The dihedral problem, if any occur, can be corrected by your mounting blocks, and bending wire strut, plastic covered, if not a scale robo strut type.
I could post pics of my wing for reference if you want to try it.
Steve