Huge difference between esc temps and motor temps

[srislash]

Soooo I just went to run the boat and my motor was making the most God awful sound. Took it to my LHS and was advised that it's probably a loose magnet. I was also advised that repairing these magnets is usually unsuccessful.

So I think I am ordering a new motor. Was thinking of dropping the kv so I can run 8s. My esc is ratites up to 14s. The 1300kv leopard was going to be my pick. High enough kv that 6s should still be fast but low enough to run 8s. Thoughts?

Ok let's start simple before throwing money at it, is the flex cable greased?

[RuntheraceAMC]

Always. I ran it out of the hull. It quivers and shakes. Probably only doing a few hundred rpms

[srislash]

So the bad noise is definitely the motor? If so ok, stay off Leopard and go to TP. Far superior.

[RuntheraceAMC]

I don't even know where to start with TP. I was running a 4092 1730k on 6s. Hoping to find a motor that will do 50-55 on 6s and high 60s on 8s

What motor and kv should I look at. Will my 40mm engine mount need replaced?

[srislash]

I am pretty sure physically they are same size. You are in the right ball park KV wise,1300-1400 for your wants.
I just measured one here and have 39.5'ish mm so that is not much difference. You could put a piece of paper around the can where the tail ring hold the motor


BTW stuff is in the mail system

[RuntheraceAMC]

Thanks man. I appreciate it

So which to should I go with? Diameter and length

[srislash]

I would go with the 4260 here: http://www.tppower.com/sort.asp?class_id=4&news=115

Either a 4Y or the 7D. That is on the TP site though not the US one.

[srislash]

Here you go, in stock: http://www.tppowerusa.com/motors/in-...p-4060-1300-kv

[RuntheraceAMC]

I don't understand what I am doing wrong. I thought my 4092 was dead. So I threw my 4074 back in there and went to the lake. 5s for 2:30. Temps were 120. 6s for 2 mins temps were 125 so I propped down from a 648 to a 545 and it did two passes, then the motor made the same shaky rough running sound as it did on the 4092. I tried to limp it in but it died. Smoke all in side. Motor and esc Temps were 190 degrees!!! What the heck just happened. My esc is dead. I'm convinced my 4092 is fine and it was the esc all along. There goes $250. Now what. Drop another $250 when I have no idea what caused the problem. I am at my wits end!

[srislash]

Well I did not see that coming, besides motor what did you change anything?

[RuntheraceAMC]

Nothing. Even proper down. In the past I had even used a Prather 235 and Prather 240 on the 4092

It was like something changed with the esc to cause it to run poorly with the motor and it just burnt up. How do you go from 125 degrees to 190 in two passes

[srislash]

No water flow

Were you able to see any come out the outlets?

[RuntheraceAMC]

I didn't check. But I've never had an issue

[RuntheraceAMC]

The past is the past but now I have no idea what esc to get

[srislash]

DID you have any water within the hull? I really didn't expect you to throw another motor in.

Can you blow thru the cooling lines? This time of year the water can get leaves and such in it, it has happened to me. I lost a Lehner and Swordy that time.