What solution for brown-outs?

[zooma]

At first I thought that I was having a receiver range problem. After trying three different Spektrum rx models (SR410, SR2000, and MR200), now I am thinking it's a brown-out problem.

Setup is six cells, Leo 4092 1480kv D wind, Swordfish 220 Pro+ esc, auto timing, propped for about 120 to 140 amps. Symptom is that I can get up to full throttle for about a half lap, then the motor quits. After about a minute, it comes back to life. Then I can go another half lap or less and it quits again. And so-on. At any time it comes back to life, I can make it back to shore at partial throttle. Data log shows acceptable volts, amps, and temp.

Wouldn't the log show some sign of an esc cutoff? So I am thinking that the BEC is not delivering enough voltage under load. Next time out I am going to try a rx batt in the boat.

Has anybody had this happen?

[rickwess]

A momentary glitch can be solved with a capacitor connected to the receiver. It sounds like your issue is that your ESC is entering LVC. The most likely cause is that you have the cell count programmed incorrectly.

[JimClark]

where is your antenna? and are we talking a carbon fiber hull

[eboat]

What lipos are you using ?
Are they a 1P set up or 2P ?
What C rating are they ?

You might be just drawing too much from them and the voltage drops too far

[785boats]

Do you have the LVC programmed to motor shut off, or reduced power, in the event of the LVC being hit?
If it is set to reduced power & the motor is just stopping then it could be a bad solder joint on one of the connectors. Give each connector on the ESC & batteries a good pull & a wiggle to see if the solder has let go under the heat shrink & is only just making contact until the current separates the solder again. It's happened to me before more than once.

If you have the LVC set to motor shut off, try the pull & wiggle test anyway. It could still be the problem.

[ray schrauwen]

You are still using internal BEC? Try external.

'-----

Yes, an Rx pack might help.

[zooma]

A momentary glitch can be solved with a capacitor connected to the receiver. It sounds like your issue is that your ESC is entering LVC. The most likely cause is that you have the cell count programmed incorrectly.

Interested in the glitch buster capacitor. However, there is no rudder glitching, just motor cutoff.

I program this esc using a laptop with usb interface and Hiefi Swordfish software. Have been using LVC set to six cells and 3.0v per cell cutoff. Last time out, I reprogrammed for LVC almost deactivated. Still had the problem. I don't think it is LVC.

[zooma]

where is your antenna? and are we talking a carbon fiber hull

Yes, CF hull. With MR200 rx, longer antenna is in a 12" tube and shorter antenna taped to top of deck. With SR410 rx, the antenna is in an 8" tube. With latest SR2000 rx, antenna is in a 3" tube.

[zooma]

What lipos are you using ?
Are they a 1P set up or 2P ?
What C rating are they ?

You might be just drawing too much from them and the voltage drops too far

Fairly recent Turnigy nanotech 6S1P, 5000mah, 65C. Data log is showing 22v, sometimes down to 20v. But this happens even with fresh charge.

[zooma]

Do you have the LVC programmed to motor shut off, or reduced power, in the event of the LVC being hit?
If it is set to reduced power & the motor is just stopping then it could be a bad solder joint on one of the connectors. Give each connector on the ESC & batteries a good pull & a wiggle to see if the solder has let go under the heat shrink & is only just making contact until the current separates the solder again. It's happened to me before more than once.

If you have the LVC set to motor shut off, try the pull & wiggle test anyway. It could still be the problem.

Will check

[zooma]

You are still using internal BEC? Try external.

'-----

Yes, an Rx pack might help.

Sure, external bec is an option. I'll try an rx pack first, since I have one.