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[AndreZS1AZ]

I need some help.  I hooked up my Turnigy 120a marine esc to a 3660SL 3180kv motor.  The esc and wires got hot after +- 40 seconds and only drawing 40 amps.  Any ideas?  This is for a 1/10th hydroplane.

[TomHugill]

Hot or warm?

[derekwarner]

Andre.......you need to confirm a few more points

40 amps @ what voltage?
prop style...diameter, number of blades & pitch?
loaded or unloaded?
as Tom asks....how hot?

Derek

[AndreZS1AZ]

That is the motor.  The esc was hot, not warm.  Using 11.2v lipo pack.   I come from an nitro rc plane background and am possibly doing EVERYTHING wrong.  I hooked up a 12" wooden plane prop and bench ran it to check currant draw.  I guess that this is not the correct way.  All help will be appreciated once you have stopped   

[Calimero]

You had water flowing through the ESC and motor, right ?

[AndreZS1AZ]

Nope, no water.  I did not think that it would matter for the short test that I did.  Motor was cool.  As I said, need help and I am willing to learn.  lots of questions still to asked if you guys don't mind.  Give me nitro and I'm happy but with brushless I am feeling my way with help.  The hydroplane is still under construction as I am waiting for parts that a friend from the US has posted.

[Calimero]

With 40 amps going through I would run water through the ESC. Water-cooled ESC really need the water. They're not like Car ESCs with big heat-sinks (and sometimes fans).


Getting hot under 40 amps with no water cooling doesn't sound unusual to me.

[AndreZS1AZ]

Thanks for the replies.  Now, is this too much motor for the esc?  I was thinking that the esc would be able to handle 40 amps without water cooling.  OK, I think that I see where you guys are coming from.  The ideal thing would be for me to build a test jig with, say a 45mm prop, add some forced water cooling and try again.  Would the prop then be loaded if this setup is static?

[Calimero]

Water-cooled ESC usually s*uck without the water cooling. You could try again with the airplane prop but with a bottle of water (or a small water pump) feeding cooling water and see how that turns out.


Static testing of a fast-electric is not so easy. To get a somewhat realistic figure you'd have to keep the hull level with the prop half-submerged only. Good luck on a small water tank ...

[AndreZS1AZ]

Thanks Calimero, Tom and Derek.  I have now come to the conclusion that you do not run a water cooled esc without the water   No problems with the water tank.  I do not have my strut or flex shaft at the moment but I can make a test jig using a straight shaft and use a friends swimming pool.  I will use a gravity feed for the water cooling for test purposes.  As I said , I am new to fast electric and need help.  The hydroplane will be 87cm long and the weight is unknown at the moment.  All ideas are welcome.