Esc going into protection on blackjack

[montymike]

Got the new 3831 dynamite motor and can't run boat with any bigger prop then a 642, or 445 with out going into protection mode. Motor or esc or batts cool. Esc is set to 7.5 timing using 6000ma 70 c batts. 2c series don't own a data logger but don't understand , put a 645 on it protection after aboat 30 seconds 120a speed control should handle it.

[CraigP]

Not near enough info... Give full specs please...

[fweasel]

Was the new motor installed for fun or was the old one damaged? I run pretty aggressive props on that same setup, not for long, and don't have shut down issues. Are you certain the new motor is aligned perfectly and there's no binding of the flex cable at the entrance to the stuffing tube?

[montymike]

For fun ,this motor runs cool.

[montymike]

Marked were the screws were with exacto knife.

[montymike]

Not binding.

[MADRCER]

Got the new 3831 dynamite motor and can't run boat with any bigger prop then a 642, or 445 with out going into protection mode. Motor or esc or batts cool. Esc is set to 7.5 timing using 6000ma 70 c batts. 2c series don't own a data logger but don't understand , put a 645 on it protection after aboat 30 seconds 120a speed control should handle it.

On 4s or 6s? I may have experienced the same thing on 4s but thought it was my batteries not having enough balls...Now that you say this it may have been the esc shutting down.

[fweasel]

A 645 is a lot of prop for a 2000kv 6S setup. My ABC 1715 runs a full 4min on two 3S, 5000mAh packs and just a handful of SAW passes on a 1716, 543 and 643 octura comparison respectively. Whats the gap between your strut and a table surface?

[jim82]

Do you have lvc turned off?

[MADRCER]

I just noticed you are running 2c (2s).. It's been a few months ago when I experienced it and my ESC had a flashing light when I got the boat rescued back to shore can't remember if it was red or green...red I think. It ran for only about 45 seconds then stopped in the water my first thought was a wire came unsoldered, then I figured it was my batteries I were using. Hadn't had time to try it again.

[montymike]

No set to 3.4 set it to 3.2 not tried it yet

[montymike]

Flat to table.

[montymike]

And on 4s

[fweasel]

Sorry, I had incorrectly assumed you were running 6S, didn't see 4S mentioned. 3.4V is too high of a LVC on that 120A ESC in my experience. With good high discharge rate packs, 3.2V is the highest setting I can use without tripping early. FWIW, I don't run to LVC anyways and time my runs with my transmitter.

[R2315]

I log 140amps on a 2200kv 4s setup with a x442, maybe the 120amp esc is not enough. Different boats and lower kv but it might be close.

[montymike]

Lower lvc solved problem.

[CraigP]

The terminal voltage of the battery drops under load, according to its IR. Also, poorly made wires or bad connectors also drop volts. If you have an IR, check all your connections and wire links after a run. Maybe you need an upgrade. 120a is pushing a 5000mah towards 50C, so you need a healthy electrical system!

[NativePaul]

120A on 5000mAh is 24c.

[Bp9145]

Uh oh. .

[montymike]

120a esc , 6000ma 70c updates when i changed lvc to lower setting works fine.

[CraigP]

120A on 5000mAh is 24c.

Yes, brain fart!

[montymike]

L.o.l. i do it all the time.