We're not coming this way again, as my old Instruments instructor Rapid Ron used to say, so before we move on let us touch upon that optional way pontoons might be driven. For when I ran the flat-cat by a man who'd spent a lifetime modelling RC, fear was there may not be enough steering authority absent rudder surfaces viz. by thrust alone.
If the obvious solution in view of my antipathy toward added complexity of servos is reversible thrust, the news is good. For not only do motors run in opposite direction in view of three cables connecting them, but T-motor are known to have produced a servo and propeller designed to do so on demand:
Bad news is it seems to have been taken off the shelves, as is often the case with Chinese stock that isn't shifting fast enough. It was only there in the first place for ~ I told you modellers were nerds ~ men with nothing better to do than fly 'planes backwards. You read that right, tho' it does also provide the perfect means of doing doughnuts in catamarans.
And there's more, because Futaba ~ daddy of RC ~ make a transmitter I alluded to aimed at tanks when they're not aimed at others. With two self-centred joy-sticks, either is moved fore or back to drive both tracked vehicle and flat-pack catamarans. It's called a 'surface' transmitter as it is designed for just that viz. terrain or water:
Finally I'd love ~ and know you would too ~ to control the pontoons independently so that if you were to swap one out, power supply and circuitry goes with it and the new one's oven-ready. To enable it we'd have to use the same transmitter to talk to independent receivers, but according to Google that's possible, as explained here by a woman with a large chest.
Studying it I got an erection, which eventually I blamed on the multicopter:
Ed. The ability to fly backwards is known as 4D aerobatics amongst nerds, who for 6D draw on friends to shake their chair and spray water.


