Spark eliminator is not good thing with combination of ESC without switch. When you connect ESC with resistor, it will "see" variable voltage during arming procedure regarding consumption of ESC especially when it beeps. If you connect really quickly, before program starts to check voltage everything is OK.

Usage with ESC with slide switch does not make problems, because ESC waits with arming until switch is on, so there is plenty time to connect it also with resistor. For example Spin ESC do not do anything when you connect battery. Only if you switch on slide switch, it makes 5V, processor starts arming procedure - waits until it sees safe "off" throttle singal and only then it arms itself and then beeps.

I presume he means that if we turn off auto-lipo detection, we can use a 100-ohm, say, resistor for desparking.   

There are 2 problems:

1/ ESC will check battery voltage after connecting battery. If you use resistor, the voltage goes up slowly and ESC can see too low voltage, because it will start before completaly charged capacitors. If you use ESC with switch (ESC with switch, not timer separated with switch) then the processor starts when you switch it on, and you will do it only when battery is properly connected. If you do not have switch and ESC starts checking too early, and you still want to use resistor, then you must switch off battery checking by some setting which depends on ESC firmware ... exactly like guys from CC recommend. Slide switch on timer cannot affect this problem.

2/ ESC will beep after arming. ESCs usually check several things after start and if all is OK, then ESC arms itself and usually beeps after arming. One of those thing to test is also iddle signal from timer. So if you do not have switch, it will start already with battery connecter via resistor and beeping will make voltage drop and it will confuse ESC and push thim to low voltage regime. Slide switch on ESC will prevent this situation because it will allow all tests only when you switch it on with properly connected battery. If you have switch on timer wire, it will not allow making iddle signal and it will also prevent arming and beeping.

Well ... little longer answer, but as you see it is not so simple :- ))) All depends on firmware in ESC, but short answer YES is valid only for ESCs with switch (for example Jeti Spin). If you use switch on timer lead, then the answer is "it depends" and proper solution for CC is in Peters post (the question is if they know that we feed ESC with proper signal already connected with resistor). If you do not have any switch, then I do not recomment resistor without good testing.

I do not recomment resistor without good testing.

initial test:
Auto  Li-Po off
Low Voltage Cutoff set to 15.0 V (for 5S)
Jeti 4 mm Anti Spark Connector
no propeller

No cell count beeps
Startup as usual

rgds, Peter

Peter and Igor,

For those of us not familiar with the Jeti 4 mm Spark Eliminator Plug, just how does it work?? Are the contacts set up so that as you engage the plug it first connects a resistor to charge the ESC capacitors and then as it is further engaged it shorts the resistor circuit so that the ESC is fully connected to the battery (with full voltage) What are the ohm and watts value of the resistor?

For what little good it does: grrr.

There's no reason for that in a system where software has so much control over things.  All they need to do is wait for the voltage to stabilize, then do their cell count.

Specifying a "do-not-exceed" resistance isn't a bad second place, though, particularly because just about anything you could do with timers could be defeated with a high enough anti-spark resistance.

It'd be way expensiver than an RC one just from sheer lack of volume.

Plans are in train (I thought I had started a thread, but I can't find it).  I don't know if I'll get farther than releasing a design into the wild under GPL for the software and one of the Open Hardware licenses for the schematic & PCB design.  But I want to do it just for me, if nothing else.

As an added plus to a DIY thing, if you don't like it you can always change the software yourself .