Did I get a bad motor?

[Peter A]

I have a TP4070 10D 830kv motor in my 1/8 scale. From the first run it ran hot. It has the longest water jacket on it I could get. Plenty of water flow.
Previous motors, a Turnigy SK8 850 kv, and a TP 4060 950 kv ran cooler, the Turnigy motor was mint but the wires/insulation coming out of the motor were damaged and two of them melted off.

The esc is a ZTW 150 HV.

Yesterday I did one run with a detounged X452 and all the motor windings have got really hot and it has the burned stink to it now. Last week I ran an X447/3 with an M cut, and a Prather 235, no worries.

So my question is, did I just happen to get a motor with bad windings, or could the esc have an issue also?

BTW we run 10s in our scales here. Hull is an Albert Lee. 20210710_113733.jpg

I am thinking to get a TP 4070 6Y 780 kv to replace it with, that would allow me a little more freeway with prop sizes.

[koen]

I had the same problem with a sprint cat first motor was a sss 720on 12s ran perfect speed 70mph temp good ,i changed only the motor for a TP 4070 850kv, motor ran hot and not faster(with sss prather 245 70mph and with tp 62 mph and very hot) so changed the motor again now a Lehner 2260/8 and doing 73 mph and stays cool, the bottom line is i can't get moore speed out of a tp (also with an other boat same result)

[koen]

The Lehner runs on 8s

[Alfa Spirit]

Can you run a 56xx motor or it' s too late ?

[koen]

Hi peter maybe you can find something in the setup ,a tp 4070 is a heavy motor

[zooma]

My first thought is that your ESC is set for too much timing on a D wind motor. Should be 0-3 degrees. Was the ESC set for a Y wind some other time?

[koen]

yea that is a good point , i have asked TP for timing my motors and TP says timing 0 degrees for all there motors

[Peter A]

Hi peter maybe you can find something in the setup ,a tp 4070 is a heavy motor

Weight isn't an issue, I have had to add weight to keep the boat down at speed. I did do a check on the turn fin as I had quite a lot of left rudder trim on and found that it was not parallel to the boats centreline so I have shimmed that now. The boat is an ex nitro and the guy who built it, well didn't always do a great job of things. I think I will get a 780 6Y version and try that as I should be able to get one here this week. Or first club race day is Feb 6 so not a lot of time to waste.
The 850 kv motor is still working but I do not trust it.

[Peter A]

My first thought is that your ESC is set for too much timing on a D wind motor. Should be 0-3 degrees. Was the ESC set for a Y wind some other time?

Yes timing was set on the lowest value. I checked that after the first run.

[Peter A]

Can you run a 56xx motor or it' s too late ?

I could with some minor mods. A 5684 or 5692 800 kv is an option, but a little more cost and perhaps harder on the esc.

[Peter A]

What is also interesting is that while the windings cooked, the 6mm bullets didn't get any hotter than normal, they show no signs of stress.

[Alfa Spirit]

I could with some minor mods. A 5684 or 5692 800 kv is an option, but a little more cost and perhaps harder on the esc.

56xx is more expensive and more torque too.

[Peter A]

56xx is more expensive and more torque too.

I decided to go with the TP 4070 780 kv. SSS5684 800kv was an option but 50% heavier and I would probably have to modify my cover hatch as well as the mount to make it fit.