Scorpion hk4035/800 cutting out on full throttle

[racerr73]

Hi Guys,

I have a scorpion hk4035/800 outrunner motor runing on 10s with a schulze fut-xl-40-160wk esc. The schulze settings on the dip are 1,1,0,0,0,0,. I have found if i stand on the gas hard out of a corner the esc shuts down, i then move throttle to off and then it will start again and away we go. If i accelerate out of a corner very easy on the throttle it doesn;t have a problem. I also use this esc on the same settings on a nue 1527/1y without any problems. Has anyone come across what causes the shut down on hard acceleration with a scopion motor to this esc.

Thanks
Trev

[Ub Hauled]

I've heard from a guy in Portugal that had similar problems with a YGE ESC... he had no issues on 6s and then when using 10s it started cogging... not sure the problems are related but it's the same motor.
What kinda batteries are you using? Are they decent cells?

[racerr73]

The batteries are 25c poly rc 6000mah and this motor has a maximum amp draw of 100amps. The batteries should handle it very easily. Its not actually cogging that happens, it just cuts out on hard acceleration, easyacceleration and it is fine. My gut feeling is its the cpu in the esc getting confused with it being a 8 pole motor. I am sure and different setting on the dip selection is probably all that is needed, but which one to where.

Trev

[Ub Hauled]

edit.., not a very well thought out answer posted by me in this post.

[cacofonix]

hi folks

take care of Scorpion PK soldering !!!
a friend of mine burnt ESC last week. PK are not solder but glued with some king of black epoxy
after 10 second, this black something melt and ESC lost a phase : boom !!

herve

[jcald2000]

raise the timing on the schultz, more poles need more timing.

[Fluid]

The batteries are 25c poly rc 6000mah and this motor has a maximum amp draw of 100amps.

It is a common misconception that if the motor specs say "100 amps max" or some other amperage, that is all the motor will draw. Believe me that is NOT the case. Most motors will pull 'way more than their "rated" amperage if overpropped. That Scorpion can draw well in excess of 250-300 amps if given the cells to supply it under a heavy load. It is very probable that the load is high enough to drop the cell voltage under the LVC.

raise the timing on the schultz, more poles need more timing.

NO! The problem may be worse because the OP is already using the ESC's maximum "hard" timing setting. Set the ESC = 1,1,0,0,1,0 and see if that helps. Really, we can't help too much more without knowing the specifics of the install - what model, what prop, etc.



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[sailr]

You are hitting the voltage cutoff momentarily. When you do a hard accelleration, it is pulling the batteries down sharply and the esc sees the cutoff point. Prop down and your problem will go away!

[Gerwin Brommer]

Are you on 10S single pack or 10S 2Packs ?

[crabstick]

indeed does sound like its hitting the LVC.. Have experienced this with a tired set of 6s packs.

[racerr73]

cacofonix,

what do you mean by Scorpion PK , my motor is a HK.

Gerwin,

i am using a 6s and a 4s 6000mah 25c packs in series.

sailr, crabstick,

The packs still had 50% left in them when i brought the boat in, i can;t see how it can hit the lvc with packs half full.

Thanks
Trev

[crabstick]

cacofonix,


sailr, crabstick,

The packs still had 50% left in them when i brought the boat in, i can;t see how it can hit the lvc with packs half full.

Thanks
Trev

Hitting the LVC in this case I believe is caused when you draw too many amps (ie packs cant supply enough to keep up) and getting voltage sag. the voltage under load is dropping below the cut off. Has nothing to do with how much "charge" is left in the packs.

even if you charge the packs fully, and over amp them, the voltage will drop. I would say this is the case TBH

[Ub Hauled]

Trev, the fact that it still had 50% left in it has little say in the scheme of things.

The guys were talking about under stress the pack could come short on delivering the necessary amps that the motor was asking for with that particular prop.
It may be easier for us to help you out if all the setup parts were discriminated here.
So far we know the motor and ESC, what size prop was it?

4035/800 or 1527/1Y
Poptart
6000mAh 25c (150amps constant)
Prop?

the 1527/1Y has a little more watts then the 4035/800 so it may be claiming less amps and therefore was working w/o a hitch... both these motors are pretty hot and you could easily over prop it claiming too many amps from the cells.

[Gerwin Brommer]

Prop down or go to 10S2P
I know which choice is cheaper, haha.

[Fluid]

The source of the problem is probably not the 1P pack configuration or the prop. Look here for a successful 43" cat with the same motor.
Different ESC, 10S1P, x457/3 = 61.8 mph.

http://www.jrcbd.com/showthread.php?t=25996

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