mr.magoo54

My Feedback: (45)

I just purchased a turnigy 42-40a-1050kv motor with a tunigy sentry 40amp esc. I used a turnigy 3000 3s 20c battery. When I advance the throttle all the way to full the motorstalls and loses rpm and the esc gets hot. I used a 11.5 - 6 e-prop. Somebody Please tell me whats wrong.

whitecrest

Welcome to the forum!

Sounds like you're using too large a prop and overloading the motor and ESC. The ESC must have a thermal shutdown feature. I'd start with a 9x5 and see what the amp draw is. This motor should run well on about 30 amps using 3S, as will the ESC and battery. A wattmeter is highly recommended to ascertain your actual current draw as you adjust the power system.

MODEL : TR42-40A
Max Efficiency : 30A
Max Load : 35A
Kv : 1050
Power: 550W+
Weight: 125gr
Pull : 800-1200gr
Porp Size: 10x6 or 9x5
Voltage 5-15v
No Load Curr: 3A
Size: 42x40mm 5mm shaft
Power equivalent : .30 to .35 glow engine

jdetray

Any time you increase the prop beyond the recommended size, you should use a wattmeter to check the current. A larger prop will draw more current than a smaller one, and as Tim said, that's probably why your ESC overheated and your motor slowed down. Those are classic symptoms of a prop that is too big.

- Jeff

fmw

Also, your choice of ESC's was on the light side for that setup. ESC's don't weigh that much. I recommend getting the next larger size every time. To me it makes little sense to run things at the limits of their performance parameters. I would have chosen a 60 amp ESC. That prop might well have worked fine with the larger ESC but the only way to know is to measure the current as mentioned above. So the solution for you is use a smaller prop or a larger ESC or both.

Geoped

Hey
I'm having the same problem with a Brushless inrunner motor
Hobby town upgraded this in myfriends Sky Surfer
Patriot 450 motor with eletricfly SS-25 ESC 25 amp
the motor is rated at 20amp peak and 18 amp cont.
and the motor and ESC over heats ( way to hot can't even touch) in about 45sec and shuts down
and the prop is only6x4
Hobby town solution is to install a bigger ESC like a 60 AMP
I decided to buy a smaller Motor 370 that I hope the ESC will handle
I should receive the motor in a few days and I'll let you you what happens .

I don't think the ESC or the motors are correcly rated from the manufacture!!

NOTE:
the first time the plane flew the ESC over heated and the 2.4 receiverno longer works

Geoped

jdetray

If the motor is overheating, installing a larger ESC is not going to help. The larger ESC will probably run cooler, but the motor will still overheat.

- Jeff

Geoped

Thanks Jeff

Let me clearify on the motor it is getting hot but not shure if it's over heating.
The 25Amp ESC is over heating and shutting down power to the Motor and receiver



Geoped

whitecrest

If the motor is too hot to touch (you confirmed that it was above) than you are probably damaging the magnets. They will begin to lose their magnetic properties (their pull) at about 80C (for neodymium), and that can start a runaway process that will increase overall current draw. It is always best to run conservative current draws to avoid heat build up in the battery, ESC, and motor. This can be done while still providing excellent power to the prop.

Dr Kiwi

What is the Kv of your Patriot 450 motor... if it is anything over 1500-2000Kv there is no way it can direct drive a 6x4 at <20A.

Geoped

I have installed a Elite 370 inrunner motor with 6x4 prop still using 25 AMP ESC
I bench tested the motor and it ran ok plenty of power it did get alittle hot
installed a heat sink that would cover the whole motor and the temp of the motor has come down
so weather permitting this glider is going airborn Saturday


Geo

Geoped

Update on the inrunner motor
the glider flew perfect
two test flights at full speed for a few minutes and landedto check motor and ESC
both where warm but not too hot
3rd test lasted for 15 minutes and all is well
Thanks for the info on the motors and ESC
I hope Charlie K had luck with his motor over heating
thanks Geo