Will my ESC hold up

[POWERS]

I'm running the stock motor with a turnigy 120amp esc. Using a X642 prop and a receiver pack. Ive run it fine with 4s and 5s. My question is will my esc hold up on 6s? I always hear people talking about props being to big for a set up and causing problems. How exactly does one come to that conclusion other than running it and seeing what happens? Please school me!

[Fluid]

If you change nothing else but the voltage, the amp draw and rpm will increase. A setup that was safe on 4S will often be to much for 6S - if you use the x642 on 6S you will sooner or later burn up something. Drop down to an m440 or x442 and let the motor breath safely. Amp draw will be reduced and speed will still be higher than 4S.

Or go ahead and keep the x642 and wait for the smoke.


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[POWERS]

So would my esc or my motor be the weakest link in this set up?

[Fluid]

Both could be at risk. I've datalogged that motor with the x642 at 80+ amps average in other boats, going to 6S would up the amp draw close to the ESC's amp limit. Too, it is not a good idea to run any ESC at the top voltage limit. This can shorten the ESC's life under typical FE use. I have no personal experience with that ESC but I have seen them cooked.

The motor is designed for 4S, running 6S will stress it. The motor wires and the connectors are prone to fail if they get too hot. You may get by if you limit run times to reduce heat buildup...but that is difficult to do, most of us want "just one more lap..."


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[POWERS]

Is there a formula or some way to calculate amp draw with a particular prop?

[d.a.v.e]

To do it right you need an Eagle Tree or some other kind of data logger to see whats really happening. The base module is about $80 then you can add things like a GPS, temp wires, rpm, etc.

I'm looking to get one soon, thinking of starting with the base and GPS add on. I finally saw one used a few days ago and was sold.