Mini Tazor "cutting out"?

[gobigkahuna]

I've got a problem that I'm 99% sure is being caused by the ESC (a Dynamite Mini Tazor). I'm using a Spektrum DX5i radio with BR6000 receiver, a Dynamite Mini Tazor ESC and a 3600 kv brushless in runner motor. I'm using a 12v 20amp bench power supply. When I run the motor without any load it runs fine. When I run the motor under load (prop in the water), it cuts out after running for a few seconds. I put an amp meter on the power side of the ESC and it shows an amp draw of 10.7 amps under load. The ESC is rated to 25 amps continuous and 30 amps for 10 seconds. The motor is water cooled and seems just warm to the touch. The ESC feels pretty hot, which is surprising since I'm only running the motor for a few seconds at less than half its rated amps. What I'm guessing is happening is that the ESC is overheating and so the automatic overheat cut off is shutting it down, but why would it be over heating if the amp load is only 11 amps and it's rated to 25?

[BOZINATOR]

If this was working at one time disreguard this input.;) Is your ESC programmable? If it is...check the cutoff voltage, the type of cells (lipo, ni-cad etc) Check the battery voltage when loaded (not drunk heh heh) and unloaded conditions. You could have a thrust problem..If you push on the prop, towards the motor, does it turn freely or is their some resistance or rubbing? Do you have a ESC you can substitude?
jim:)

ps: becnch power supply is pobably your testing problem..They are noisy for checking electonics that have oscillators and voltage/pulse width dependent componets. Try to use a freshly charged battery you will be using in the boat;)

[gobigkahuna]

This is a newly built project, so first time for all the components. I measured the voltage at the power in end of the ESC and it varies from 11.77 when stopped to 11.85 when running. If I run the motor at "half throttle" (an amp load of roughly 5 amps) it seems to run fine. If I run it at "full throttle" (an amp load of roughly 10+ amps) it runs for a while then shuts off. At that point if I center the joystick and try to run it again it will, but only momentarily (2-3 seconds). At this point the ESC feels hot to the touch. It seems to me that at full throttle it's overloading the ESC, but that doesn't make sense since it's rated to 25 amps continuous / 30 amps intermittent. I called Horizon's tech support and they don't seem to understand what's going on either, although they seem to think it may be a voltage sensing problem (the ESC apparently has an automatic cell sensor).

This will be going into an underwater robot (ROV), the reason for the power supply instead of batteries.