I checked them and they're all around 2 ohms +/- .5 (my meter isn't that great).

So far so good. I am ground testing tomorrow and will tell you how they work.

I'm going to use the latex tubing two ties per end method.

I have used these now for the main charge on 5 dual deploy rockets and in about 12 ground tests. I plan to use them with my Raven in tandem with commercial e-matches.

I use the surgical tubing technique.

Every one has worked.

I have been warned by several more experienced rocketry enthusiasts about the dangers of roll your own e-matches.

If nothing else is available (or you have a rocket you're not fond of) I do think these matches work.

Of note, I ohm checked each one. All but one fell within spec. It worked too, but I used it on a ground test.

The price savings is not there. Commercial e-matches are about the same cost.

Steve, your previous post, to which e-matches are you referring, just to be clear, since four or 5 types have gone by in the thread here...

The standard answer would be NO, but then it might depend on the altimeter. One of the electronic geeks could answer this better than I can but NO. The Q2G2 ignitors should be safe to be used for deployment charges unless your avionics are powered by a 12 volt battery. FWIW, the specs on the J-Tek's - Bridge Wire Resistance - 1ohm plus or minus .2 ohms, Maximum No-Fire Current .30 amp. Minimum All-Fire Current .75 amp, Recommended Min. Firing Current 1.00 amp, Recommended Nominal Firing Current 1.25 amp, Maximum Test Current .04 amps. I don''t have the specs on the Q2G2's.

After testing a small sample size, the all-fire current for the Q2G2s is about 0.3 Amps, which makes it the most sensitive ematch I know of. The nominal resistance is about 2.5 +/- 1 Ohm.

Featherweight altimeters have a current-limiting resistor for the continuity check that's big enough that you can use whatever battery you want. Even at 100 V you would still only have about 1/500 the current needed to fire a Q2G2.

The Estes electron beam launcher runs enough current for its continuity check to power its incandescent flashlight bulb when you put the key in, which is why it will always set off a Q2G2. You can replace the incandescent bulb with an LED bulb from a pinball machine supplier for < $5, which reduces the current to where it's not a problem. Plus it's brighter and more durable.

http://ncrocketry.org/modules.php?name=Forums&file=viewtopic&t=1741&highlight=burst

It's in the above forum. Hope this helps!

I have yet to fly a dual deploy, so maybe my experience is too limited.
In my efforts to keep the expense down for setting off deployment charges, I have had 20 for 20 success in ground tests of using minature Christmas tree lights. A string of 100 lights sells for aobut $4.00. The string uses about 6 amps. That would mean each bulb, (basically, two leads, with a filament of nichrome connected to the two, encased in a glass bubble) uses about .06 amps to glow. I have tested it with as small as a 1.5V AA battery and had success. I cut the wires from the string, carefully break the glass into a trash can to avoid injury, (both present and future), and check for continuity. If all is good, I place this in my ejection charge container and pour my powder over it and close it up. I have had 100% success rate in 20 ground tests. For a still smaller unit, I pull the unbroken bulb from it's socket, solder on some longer leads with #30 wire( I have also expiremented with #26 wire) carefully break the glass and then dip it in pyrogen, like the magfire and seal it. I have made a little test stand and since I have an abundance of old engines, I have tested to see if I could get this ignitor into a small nozzle. I could and it fired successfully. I have only done this about 6 for 6 times. As this has been succesful, it would seem to me that I can make ignitors for motors or ejections for about $0.10 each. It is a little time consuming, but it fires the imagination and pushes my envelope. If anyone sees any flaws or holes that I have not described or thought of, please let me know before I make a bigger fool of myself.

Remember, if the women don't find you handsome, at least they will find you handy!

I have seen some people mount the socket for the bulb in the end of the ebay plate and just plug the bulb into it. 8) Then all you have to do in plug in a new bulb for the next flight. I think I will try this on my next rocket that will stay under say 12000 agl 😉