Thanks for the information.
Boat is a Sea Commander (Aerokit)
I’m fitting J Perkins M4 - 45S Boat Propeller
Will follow your recommendations re a fuse
Thanks
Paul

Thanks for the info PK 👍
Both motor and ESC are good for 12V.😀
I don't know what boat you are putting this kit in, or the size and type of prop you have fitted, but with a prop max 40mm diameter, and perhaps 1.2 to 1.4 pitch, I wouldn't expect the set up to draw more than around 20 -25Amps max. So fit a 25 or 30Amp fuse in the + supply lead to the 1060 ESC.
Especially because "Do not allow the motor to stall as it is likely to overheat quickly ... current can easily exceed 40A-50A under load and could hit 80A if stalled at 12V." Fitting a prop larger than 40mm will most likely just increase the load and thus current draw with improving performance. If the fuse keeps blowing increase it to 50Amp MAX, giving a safe margin of 10A to the max continuous current of the ESC.

If you don't want to get into LiPos you could use two 5 cell NiMh packs in series, giving 12V.
Having two smaller packs instead of one big lump helps with mounting and trimming the boat.
One pack either side of the hull helps to dampen any tendency to roll, especially if you only have one prop! The infamous 'torque roll' !! Get the highest capacity (xxxxmAh) batteries you can without sinking the boat! Use 'em as ballast - better than 'dead lead' 😉
Hope this makes sense and helps😁
Please post details of the boat / ship, maybe in a Build Blog?
Good luck🤞 Cheers, Doug 😎

Motor Spec
This is a high power '600' type motor (36mm diameter body, 3.17mm shaft, slightly longer than '550' type motors) suitable for operation at between 3V and 12V DC. The motors are usually found in cordless drills running at a nominal 9.6V but operation at 12V is possible so long as the load and duty cycle are not too high. The motors will draw a high current and so you should ensure that the power source and control hardware that you are using can withstand this.
Description
As with any DC permanent magnet motor this motor will exhibit different characteristics depending upon the voltage (and current) applied to it. To change the rotation direction swap the polarity of the current to the motor tabs. The copper motor tabs are 4.8mm wide male spade connectors, which are easy to fit 4.8mm female spade connectors to or to solder on to. An option is provided for two 500mm silicone-insulated power leads to be supplied ready-soldered to the motor.

The motor features a built-in cooling fan, which due to the high power output of the motor is essential for cooling (and so the two air vents should not be covered). Do not allow the motor to stall as it is likely to overheat quickly.
Technical
Approximate motor performance at no-load:

4.8V - 1.4A - 9200 RPM

6V - 1.5A - 11,500 RPM

7.2V - 1.7A - 13,800 RPM

9V - 1.9A - 17250 RPM

12V - 2.3A - 23,000 RPM

Be aware that the motor is capable of high torque output but the current can easily exceed 40A-50A under load and could hit 80A if stalled at 12V. Ensure that stall situations are prevented by using either a fuse or current limiter in series with the motor.

Thanks Doug
Motor spec is:
Operating range: 4.8 – 12v DC
Overall Length: 90mm including solder tags
Diameter: 38mm (Max)
Free Load Drain: 2.154 A @ 9.6v
Maximum Efficiency drain: 14.98 A
Motor shaft: 3.175mm
Speed: 20,384RPM @ 9.6v
Maximum Output Power: 106.65 watts
Weight: 240g
Stall Torque: 412 mNm

6x1.2 = 7.2V to 9x1.2 = 10.8V
Nominal voltage of an NIMH cell is 1.2V PK.
Fully charged they may read between 1.35 - 1.4V.
But they rapidly go down to 1.2V when you put 'em On Load.
To be on the safe side you also need to know the number of turns (in the armature winding) of your Johnson motor, as that determines the current limit at various voltages and max rpm.
If you can't find that info then start with 7.2V.
If the motor seems sluggish try an 8.4V, 9.6V or 10.8V pack.
Disconnect super pronto if motor or ESC starts getting hot.
I have several 1060s. I'll try some bench testing with variable power supply.
Cheers, Doug 😎

I think it is 9.6V but not positive.
Maybe one of our other members who has more knowledge on this subject could confirm.

Martin555.

Thanks
But what is the voltage of 6-9 cells

Hi PK,
Here are some spec's.
Hope this helps.

Waterproof
Cont./Peak Current - 60A/360A
Input - 2-3S LiPo/6-9 Cells NiMH
BEC Output - Switch Mode:6V/3A
Motor Limit - 2S Lipo or 6 NiMH - 540 or 550 Size Motor: 12T or RPM 30000 - 7.2V
3S Lipo or 9 NiMH - 540 or 550 Size Motor: 18T or RPM 20000 - 7.2V
Input Wires - Red-16AWG-100mm/Black-16AWG-100mm
Output Wires - Blue-16AWG-100mm/Yellow-16AWG-100mm
Input Connectors - Big-sized TAMIYA Connector
Output Connectors - 4.0 Bullet Connectors (Female)
Size - 36.5x32.0x18.0mm
Weight - 39g
Motors - Brushed Motors

https://www.modelsport.co.uk/hobbywing-quicrun-1060-brushed-waterproof-esc-sbec/rc-car-products/404964


Martin555.