KidEpoxy

I had some problems with a previous NitroPlanes order but finally got all my stuff.
One of the items was a 40amp ESC by Esky.

While the unit looked it could be up to the task, the battery leads and in particular the motor lead,
are of an absolutely unusable guage wire for 20amps no less the 40amp rating.
(pic shows the ESC, and below it the very small motor lead I removed, and for scale a male lead from a GWS350 motor)

Obviously I am still in need of a 40amp ESC, one that can do 25-30amp continuous.
Is there anyway to find out if the Esky 50amp brushed ESC at NitroPlanes
has decent sized wire leads or if it too has these little joke wires / firestarters?
Cause the pic at NitroPlanes shows the same tiny wires for the 50amp:

opjose

That particular ESC is for a BRUSHED motor, which tends to operate at lower voltage.

These wires, while not optimal, should be fine for 7.4-9 volts.

KidEpoxy

[link=http://www.nitroplanes.com/40eshiqurcai.html]http://www.nitroplanes.com/40eshiqurcai.html[/link] It even has "6-15v" "40amp" printed on it.
The theory that lowering the voltage to just 6 or 7 cells dont hold water:
Ask a rc car guy what guage wire he would run a 7.2v 40amp at, and he wont say these ittybitty servowires.

I need to run (4) brushed can motors on 3s Lipo at around 7-8amps peak each in parallel.
I just want to know if the 50amp Esky brushed ESC at NitroPlanes
has decent wires or the same tiny ones as the 40amp.

opjose

As I said it is "less than optimal"...

It certainly will not work for your application.

The answer is YES the larger E-Sky has the itty bitty wires.

KidEpoxy

ok, so "less than optimal"
is just a metaphore for "catastrophic failure imminent"
gotcha

opjose

Heh...!!!

In the same way that "nominal" is often used, when it really means "just barely functional".

I'll bet you are trying to save weight, but I'm curious as to if you've considered running each motor with it's own ESC or at the least 2 motors together.

What are you building?

Sounds interesting!

KidEpoxy

If a single $16 ESC can drive 4 motors in parallel,
that would be cheaper than buying 4 $12 ESCs.... which would be 8 ESC for a SpruceGoose instead of Quad Inboards & Quad Outboards buying just 2 ESC

I'm trying to save alright, but dollars not grams.
2x $16 < 8x $12 + (7x Yharness$)


Some folks might wonder "Why not go brushless?"
Because that would require a ESC for each motor ($$$$),
<or roll the dice trying 2 brushless motors on 1 brushless ESC>
where as brushed cans can run a whole lotta motors off one ESC($).
Which of course demonstrates the problem with a 50amp brushed ESC that cant really do 30+amps sustained.

opjose

Could you do an ESC for each pair of motors?

KidEpoxy

I think the question you are asking is
Do I want to spend the money to buy more ESCs than I need,
because these ESCs cant do what they are suposed to.

The answer is
No, I wont buy more units than I need of their misrepresented product as a reward for the deception.
If the 15v 50A "continuous" could do 11v 30A I would buy it, but it cant even do that with the tiny wires.
So I wont.

As for the technical possibility of using a bunch of ESCs:
Sure. I have a pair of 7a, a couple 15a, a pair of 20a and a 30a ESC of various brands. But I would have to buy a few Servo-Yharness for all them ESCs at once rather than 4 motors on one ESC and 4 more on the other channel ESC.

But then, I also have the option of mechanical speed control because these are brush can motors. A rod & contacts assembly on a servo can progressively turn on more pairs of motors from the inboards to the outboards: 0/2/4/6/All

opjose

Out of curiosity, other than the cost, at what point are you loosing too much going with more ESC's?

Wouldn't ganging the motors together onto one ESC lower the effective resistance of the whole array...

To use an analogy, much like hooking up a pair of 8ohm speakers resulting in an effective 4ohm setup, which could blow the connected AMP that expects 8ohms.

KidEpoxy

other than the additional cost, it would be more weight.
Which leads to folks thinking Why pay more for it to weigh more.
4 ESC on 2 channels is 2 y-harness, 2 ESC on 2 Channels is 0 Y-harness

Add that to the desire to not reward folks for lieing to me, and we come to
Not gonna buy it.

You seem to understand that putting 2 can motors on 1 ESC is good,
where is your disconnect that putting 4 cans on 1 ESC is better?

It of course would have to handle the 4motor amperage,
which was the core of this thread:
Can the 50A ESC wires handle 35a? And we now know that answer is NO.

SO it costs less to do it better,
why pay more and have more weight to do it inferior?
Just get a 40A or 50A ESC from a different brand and we might get a greenlight on the project.

opjose

I don't disagree with you, I'm merely trying to learn about what you are doing and why.

I just wondered about increasingly dropping the overall resistance. Does this adversely affect the ESC?

Or would the effect be the same as having multiple motors as you plan.