Well I just got back from the boating pool (Worcester Country Hall), and I believe I have a successful combination on the Tarpon.
The 600 can Bühler motor appears to be just right, running on 4S, pulling 2.75A peak (so ~45W) and giving a good scale speed in near silence.
After 10 minutes or so of running the motor was slightly warm to the touch, so no over heating problems which is great.
I may try 5S (21v Charged) just to see if it has any benefit, but 4S (16.8V Charged) was perfectly acceptable.
5S may just give me a better speed when the batteries are down at their nominal voltage, as 5S nominal is only a bit above the peak charge of 4S, so Thinking about it5S may be better, and just not throttle it full when the batteries are fresh.
After I blew up the second MTronics 'Marine 20' when running on 12V, I moved to my Electronize ESC to test the boat.
These are rated to 24V, so no issues with voltage, and I've replaced the FET with a very low RDSon so should it shouldn't heat up much either.
On the subject of the MTronics 'Marine 20' this second unit was a warranty replacement for the 1st unit, I ran the 1st unit on 3S LiPo, and the unit failed very quickly.
This one I was bench testing the Bühler motor on a lead acid battery (12V), and it lasted less than five minutes. Not impressed. I was not overloading the ESC in either case (<1A on the second time), so I can only assume they are just rubbish.
Ive also got a first coat of paint on the cabin, and the mast is erect for the 1st time in a few decades I would think.
Just need to order some acrylic for the windows, a new searchlight, and some brass NAVlights I can put LEDs in.
I'll try to get another video done soon, to show the improvement over the Hectoperm.
Jon