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07 Aug 2019 19:52:01
ooooh mrs jones  :D
30 Jul 2019 15:26:34
D.B. you tightwad.. :cool:
29 Jul 2019 20:14:10
DB that just means you have shed loads of props in the first place ;-)
29 Jul 2019 18:53:33
Just had a thought, even with all the crashing I've done, I haven't bought any replacement props in over a year ~~
09 Jul 2019 19:45:42
May the sun shine and winds be light for BFU#8. Son't forget lots of vids for those of us unable to attend.  :D
09 Jul 2019 18:10:30
Hope you all have a great day  :beer2:
09 Jul 2019 14:05:28
BFU#8 details locked in for this saturday - see the head of the forum thread for all details.
05 Jul 2019 21:51:05
Good for genital warts as well......or so I'm told.. :hmm
05 Jul 2019 21:48:24
Just fixed a busted SMA connector on my TBS unity pigtail, it suffered badly in a recent crash and split in two, nothing a touch of the soldering iron couldn't fix  :D
05 Jul 2019 19:44:08
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Printing 3d Forum

Spark Suppression

Started by esoarer, Friday,August 02, 2013, 10:35:03

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My new multi-rotor platform uses a 6S Lipo.
I get a heavy spark on the bullet connectors when I connect up as the initial surge is going out to 6 x 40A ESC';s and I guess into the extra capacitors I have fitted to the power line into each ESC.
It doesn';t seem to be causing an RF problem, but the connectors are taking a pounding!
I';m no expert, but I am I right in believing that normal spark suppression techniques using a resistor and capacitor could resolve this problem? Does the attached pic provide the info I need?

Thanks for your help!


I get big splashes from the Deans connectors on my 3S powered quad every time. My new build uses XT60 connectors on a hex and minimal splashes at any time.

It varies depending on the connectors you use!  :whistling:

Don';t know if the spark suppression route would work for such a powerful but short pulse of power. But that';s what it should do... :hmm:
Hubsan X4
DJI F450, Naza, GPS, DX8,
Tarot FY680 Naza, GPS, Hero3 Silver, 5.8 FPV with screen


In case you are interested Jumpy07 (Craig) has a very interesting guide on battery connector types at http://www.multi-rotor.co.uk/index.php?topic=1032.0
Hubsan X4
DJI F450, Naza, GPS, DX8,
Tarot FY680 Naza, GPS, Hero3 Silver, 5.8 FPV with screen


Thanks for the useful response !

After further research and contacting a flying buddy who knows much more than I do - I HAVE THE ANSWER !! As Below:

"The spark is due to all the electrolytic capacitors around the system needing to charge when power is applied and you cannot suppress it as such.  (Suppressing techniques are designed to absorb the spark into the capacitors of the suppressors).

The  solution would be a two stage switch on.  In essence this requires a double connector arrangement and a series resistor.  First connector connects to the batteries via a resistor and the capacitors then charge up through this resistor.  A short time later the main connector links across the resistor as this no longer has to carry the initial charging current.  This is effectively what is often done in industrial motor controllers.

Good news is that you do not need to build all this.  Take a look at Jeti Anti-Spark  connectors available from Electric Wingman, 4mm rated 75A http://www.electricwingman.com/jeti-anti-spark-connectors-4mm.aspx and 5.5mm rated 150A .  http://www.electricwingman.com/product.aspx?product=2346.  They work by using the technique described above with the resistor built in to one of the connectors  (connect this one last).

A description of operation here  http://www.modellhobby.de/Electronic/Electronic-Speedcontrollers/Jeti-anti-spark-connector-set-5-5mm.htm?shop=k_staufenb_e&SessionId=&a=article&ProdNr=058ABL55&t=9&c=22&p=22

I hope that info may help anyone with the same problem as I have (had!)


This cured my problem. Battery is always connected along with constant ground and only connecting the red positive to power the copter rather then both positive and negative everytime. I bought this one for couple bucks. But is easily made.  Also nice during trouble shooting you can teather a lead line to it like a rip cord for an emergency shut down then remove for flight.