#### HTV Boats

##### Well-Known Member

- Joined
- Nov 8, 2006

- Messages
- 2,318

Bill,

120a and 33v are not really reflective of the motor with a prop load. A 4082 L is about a minimum 2500 watt which is the important info. (2500 is a conservative rating as my TP4082 pulls 3000-3500 watts on a data logger) On 4S -14.8v you have a potential to pull 168 amps. W=Volts X Amps, or Amps = Watts + Volts. Going to 6S, 2500 divided by 22.2v = 112 amps. This all varies with prop load. Bottom line a 4082 on 4S can pull 200 amps. To be safe I would want 220 to 250 amp capability in an ESC. I have a pile of burnt ESC's on the healing shelf that are not going to work again and learned the hard way, buy more capacity.

These figures are also assuming the motor KV's are making equal rpms. 14.8v with 2200 kv makes 32560 no load rpm. 22.2v with a 1600kv motor =35520 rpm. Boat would run relatively same speed with the same prop. Using a 2200kv motor on 6s would pull 48840 no load rpm and need a much smaller prop. Not a good idea as shaft speed and resistance would also increase exponentially. Hope this clarifies a little.

Mic

120a and 33v are not really reflective of the motor with a prop load. A 4082 L is about a minimum 2500 watt which is the important info. (2500 is a conservative rating as my TP4082 pulls 3000-3500 watts on a data logger) On 4S -14.8v you have a potential to pull 168 amps. W=Volts X Amps, or Amps = Watts + Volts. Going to 6S, 2500 divided by 22.2v = 112 amps. This all varies with prop load. Bottom line a 4082 on 4S can pull 200 amps. To be safe I would want 220 to 250 amp capability in an ESC. I have a pile of burnt ESC's on the healing shelf that are not going to work again and learned the hard way, buy more capacity.

These figures are also assuming the motor KV's are making equal rpms. 14.8v with 2200 kv makes 32560 no load rpm. 22.2v with a 1600kv motor =35520 rpm. Boat would run relatively same speed with the same prop. Using a 2200kv motor on 6s would pull 48840 no load rpm and need a much smaller prop. Not a good idea as shaft speed and resistance would also increase exponentially. Hope this clarifies a little.

Mic

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