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[The long Build]

I generally use the Marine 15 but thought I would get 2 25amps for a build..

When I tested them both  on a 12v 7amp battery  (individually) the controller does not seem to have much variation on speed controll as the 15 did using the same battery, I assume as both performed the same way that there is not a fault, is this because of the lower ampage on the battery compared to that on the ESC making it act this way..

[Netleyned]

If you are using a computer type Tx  you may need to set it up to the parameters of the 25A
Battery capacity will not make a difference if you are testing with the motors off load
i.e.running in air.
Throttle throw and end points adjust on an all singing all dancing TX may need to be addressed

Ned

[ACTion]

I have handled three of these 25A units and they all exhibited very little speed change over the first 3/4 of stick movement, but then gave a huge leap up to full speed over the last 1/4. The motors also "hunt" noticeably at full speed. I think maybe they were originally designed for 4WD model trucks or off-roaders. The 15A marine ESCs don't show either of these tendencies. Ned has it about right - you'll either have to compensate using exponential throttle programming or fit some proper (linear) marine speed controllers instead.........
DM

[DickyD]

I have handled three of these 25A units and they all exhibited very little speed change over the first 3/4 of stick movement, but then gave a huge leap up to full speed over the last 1/4. The motors also "hunt" noticeably at full speed. I think maybe they were originally designed for 4WD model trucks or off-roaders. The 15A marine ESCs don't show either of these tendencies. Ned has it about right - you'll either have to compensate using exponential throttle programming or fit some proper (linear) marine speed controllers instead.........
DM

Are you back then o great one ?
I phoned Pete.

[NickKK]

Would that be the problem... I just bought my first computer tx. I set up the tx unit with the reciever, then using a viper marine 20 I noticed the LEDs flash as they are supposed to. The servo works but when I move the throttle the motor twitches and the red LED lights up ...

Any help would be appreciated ...

[Martin (Admin)]

Which computer radio did you by NickKK ?

[MikeA]

I have handled three of these 25A units and they all exhibited very little speed change over the first 3/4 of stick movement, but then gave a huge leap up to full speed over the last 1/4. The motors also "hunt" noticeably at full speed. I think maybe they were originally designed for 4WD model trucks or off-roaders. The 15A marine ESCs don't show either of these tendencies. Ned has it about right - you'll either have to compensate using exponential throttle programming or fit some proper (linear) marine speed controllers instead.........
DM

what does hunt mean??

[ACTion]

Fluctuates in speed (or guzupandaan).
DM

[NickKK]

I used a twister rc .... All singing all dancing model ...Wish I hadn't now. I can't get anything but the servos to work. I changed the rx to another boat to see the resullts .... still only the servos working ... now I put everything back in my old boat and I'm getting the same problem with that kit now...................

[Netleyned]

Try the routine needed for Radiolink Transmitters.
Power up the boat but leave the Rx switch off
Power up the TX and waggle the throttle stick up and down
Switch on the RX
Push stick up and Green led should light for ahead
Pull stick back and red led lights for going astern
Boat will then sail round the pond 

Ned

[NickKK]

I got that far setting up the throttle .. then the motor twitches and the red light comes on and stays on .. Guess I'll be asking for replacement esc ...