Oh I'm doing some learning on this boat. if my dad were still alive, I think I'd give him a slap!
The problem arose because it was a hand made mechanical diff gearbox driving two shafts, with a bloody great i/2 hp motor that nearly sank the boat! (remember, this was built in the late 50's with valve r/c gear)
All of that had to be dumped because of its age, so I installed two motors and one esc to control the twin shafts.
I've now found that the threads on both ends of both shafts are not tapped square! so theres a huge vibration in the system.Add to that the shafts are a tight fit in the tubes, and the motors have been struggling to turn the props.
I've now made the shafts slimmer for most of their length, just keeping an inch at the motor end the same thickness, to keep water out of the engine compartment.
This worked well on a dry run, so Ive just had the thing in the bath working out speeds and rudder adjustments.
BUT.... it seemed as though whatever I did, it either went backwards, or turned hard right.??????
After several minutes head scratching and cursing, I lifted the back end out to see which prop was going slow, when (have you guessed it?) I saw the props were PAIRED
Because of that old mechanical gearbox, these props have to contra rotate!!
So, another question now...
now that I've worked out which way each one is pushing forwards, should the left, or the right prop be going clockwise?
While you give that some thought, I'm off to rewire one of the motors
I WILL get this working!!!!!!!!!!!!!
Bob