V-22 Osprey Project - Design Changes for v3
It's been a busy end of 2021, and as we start 2022 I'm getting closer to building version 3 of the Osprey wing. The single biggest problem I've faced is the amount of backlash in the direct spur gear drive of the tilt mechanism. It introduces some nasty instability that, left unchecked, would likely destroy the model in flight. I've investigated other tilt mechanisms, but the one I keep coming back to is the rack and pinion design that Tom Mast uses in his model at Rotormast. His design uses a high-torque digital servo with a small pinion gear driving a rack attached to the rotor nacelle. The servo has been modified with an external potentiometer that's driven by a gear on the translation tube to give positional feedback to the servo. I like this design a lot because 1) It works, and his model is proof, and 2) it requires less torque from the servo and has less backlash. I ordered the pair of modified servos, potentiometer, and rack from Tom's site and star...