I have a transmitter with mixing built in, and wanted to try using it for independant control of paddles having been ibnspired by Graham Goodchild's Irene. (I also want to use a similar system for rowing but that's a different form of paddling)
I had modified a couple of servos for continuous rotation - but they got snaffled for my 12-year old's robot - so the paddles were fitted directly to the shafts of a pair of tape drive motors driven by servo amplifiers. Hence 2 channels each with proportional control fore and aft, all worked off one stick of my Hitec 3SS
Pics now, more details later if interested
Boat is a small balsa creation of no special merit, but got painted dull grey to tome with a modelling friend's blockade runner
andrew