Hi Christer, Ian B here, like the way you've used carbon fibre rods to replicate the full size flap construction, they wern't around when I did mine. I originally used just the one servo to drive all four flaps to keep the weight of the model to within the scale rules for F4c class and also to ensure even deflection of all four flaps, it worked, and I used a retract servo also, this gave plenty of pull and prevented any blowback as the flap deflection is 80 - 85 degrees if I remember correctly. There is no reason why two servos cannot be used or even four, but I feel this just complicates the issue and would you have easy access to the servos? If the servo(s) for the flaps is kept in the centre bay at least they are accessible. I must admit though I had each aileron with its own servo in the outer panels with no access hatch, buried permanently and never had any trouble, the inner undercarriage doors were driven by another retract servo kept in the centre bay along with the flap servo, the retracts on the prototype were modified Rom-Airs and the second Mk5 and Mk2 prototype were electric screwtrack. Like the build sequence you are doing, keep up the good work, I'm off to fly the Venom, got the gas turbine disease.

IB