Mike.. thanks for the great inspiration..so, my next build ( will be some later , because , i have to work so seriously on a jet engine cut away of a famous jet engine, to teach pilot Cadets in Academy), will be on your idea, is simple, and can turn by changing the speed of individual oars.. yes, after turning and stopping, the synchronisation of two oars can be achieved by a simple rotating switch, one rotates along with the cam, and when switched on, any of the one oar, or two, by one gear box, or by two gear box, individually, the supply from ESC to motor will pass through the wires, directly connected to the ESC.. when switched off, the supply from the battery pack, settled in a peculier voltage, passes through the cam switch, through a simple electric relay, makes the cam rotate, untill it reaches the open point of contact, that a contact open point can be adjusted according to our needs with a screw.. so, while rotating, the cam reaches the open point, then stops instantly.. this point must be set up in a position, that the oars must be in up position.. so, after any movement, or stoppage, the cam will neutralizes the positions of the oars simply.. this kind of cam switches can be found in wind shield washer wiper assemblies of automobile.. so, whatever maybe the position of the oar while in drive, will be neutralized automatically by the cam switch..
so, we can arrange the throttle set up, as with one channel, as individual, and can control the speed variation by the next two channels, means, more clearly, we can choose any of the the potentiometers, on TX usually, controls the landing gear or Flap, for throttle, so can retain in a specific value, while we can use two main control sticks, from Left and Right, for individual throttle, as one for left oar and one for right oar..