motor cuts out during wot

[paulejr]

but once i release the throttle and pull again it starts back up again. Could be the ESC or the motor overloading or ??? this is on Impulse 32. Spektrum 160 ESC, stock motor 3682 2000kv, 2 x3s Smart batteries and the prop is Dasboata 1516 and the Octura 440 , happens on both props. Boat consistent at 54 mph.

[fweasel]

Use a program card and disable LVC on the ESC, that is, assuming that can be done on that model. I have no personal experience with it.

If something was overloading, you'd have excess heat and would know about it when you check temps. Cutout like that after brief runs is usually a LVC circuit that's too sensitive, or sub-par batteries that have too much voltage sage under load.

[Bande1]

what size wiring? too small of wiring and connectors can cause excess voltage drop kicking in the low voltage cutoff like fweasel explained. do you have a temp gun? is anything hot?

[TRUCKPULL]

2 x3s Smart batteries

What make,"C" rating, and mAmp ratting?

Larry

[paulejr]

3s x2 series , Smart 100c ,5000 mah 11.2 v . wire is 10awg and 6mm connectors, using electrical dielectric grease on them, i use it on all the electric connections no matter what they are on. so is not that. the hottest temp was on the front of the motor at 132 degrees. prop on this run was Octura 440.

[NativePaul]

Voltage drop under load, try a smaller prop, lower KV, lower voltage, or better cells.

edit, I thought i had posted this before the above info came out, but it was still sitting in the typing box:
Which smart batteries? The new 120c G2s are overpriced IMO, but are a pretty decent battery capable of about 50c, but the older 100c batteries are wildly overated and overpriced garbage that is only capable of 25C and with big voltage drops at that. 30c G2s are a much better battery than 100c G1s, and while I still think they are overpriced, they are the only packs that advertise a realistic C rate that I know of, and that counts for something in my book, I wish all LiPo resellers (including themselves) would follow suit so we could actually give some credence to advertised C rates when making our purchasing decisions rather than having to scour RCGroups to see if somone has independently tested them to find out if they are worth a damn.

An X440 on 2000kv with 6S will be pulling a pretty high current, if you are on gen1 smart batteries I would suspect that they just cant handle the current and the voltage is collapsing under load.

[TRUCKPULL]

I would say it is your batteries that are the problem.

Hard case packs are for car racing.
"C" rating on them is BS.

Look at the test chart, they could not even put out 35C
Actual "C" rating is 29C
Look at the 6th. battery from the top, I bought 6- 4S packs on sale with free shipping for
$75 each. BEST BANG FOR YOU BUCK.

Larry

[Bande1]

if you got the money just run SMC batteries. or the CNHL that TRUCKPULL mentioned. Ive had nothing but good luck with spektrum batteries in my little eflite plane, though. But you got all these super nice boats you should invest in good batteries.

it could be battery it could be the esc. you're going to have to bite the bullet and learn how to go into esc programming mode or buy the programming cards for every brand. lower the LVC to 3v and see what happens.

the prop is conservative for a 32" fiberglass hull. if anything undersized. is the boat running super wet? drag increases load, load causes voltage drop.

while we are at it what charger are you using?

[ray schrauwen]

Recalibrate your throttle for the heck of it.

[paulejr]

You know how we are always tell our children to pay attention to what you are doing? ha, my oldest got me today and said ,," dad , that prop is on backwards", i looke at it and said , no the dog is in, she says, no, that prop is a right hand turning prop( she sooooo smart ) and i look at it ( the Octura 440 ) and dang if it ain't a right turning prop and that boat just went 54 mph on a ass back ward prop. Anyone ever do that?
I'm gonna test some new G2 100 C 5000 mah 11.2 v batteties tomorrow and see what happen on the same boat that had the 440 on it but one big difference is I'm gonna switch a couple motor wires so it turn CW.

[CJPB32]

I'm gonna switch a couple motor wires so it turn CW.

Then make sure you use a CW flex shaft!!!

[paulejr]

I have a cw shaft coming. New set of G2 22.4v , 100C 5000mah. Using the smart charger for all the spektrum batteries. Got the program card and set the LVC to off , see how that goes next trip.

[jkflow]

You have multiple issues.
a) take a picture of your 'backwards' setup. All standard props turn counterclockwise and other props (R-reverse) are special order. I doubt Dasboata would have send you one without lengthy discussions.
If you indeed have a 'R' prop, your flexshaft would have blown up already.

Back to
a) LVC, boat would 'die' and come back at ~50% and you can get back home
b) you might run into overcurrent, ESC would shut off and come back at 'normal' power assuming you don't gun it again

c) LVC can be Lipo related but what is the charge level i.e. cell voltage after this happened?

Also do a throttle range adjust per manual, you should be aove 60mph without issues or hesitation. READ the manual on that topic, make sure all TX trims are at zero when you do this.

[paulejr]

Well,
a), the prop in question is not a Dasboata. it was off the Zonda and is now back on the Zonda after being torn down to replace the 2 piece shafts. both the Octura (x440) and the Dasboata (1516) are ccw . I never ran the the other boat with the Zonda screw. cornfusion reigns sometimes on the work bench eh. So.


a) started up again and ran full power.
b) over current? like a voltage spike? does that happen on dc current?
c) cell v was 3.97 - 3.92 after that run.

I shut off the LVC so next run we'll see.

[TRUCKPULL]

When shut off the LVC
You will NOT have any protection.
Instead of shutting down, it will just burn up.

Why would you buy New set of G2 22.4v , 100C 5000mah, the chart shows that they are the worst packs for a boat.

Larry