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psas / Launch-12

Data about PSAS's 13th official flight.
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Order more J-Tek E-Matches #57

Closed dsigma closed 9 years ago

dsigma commented 10 years ago

We're down to 7, and we need 6 per launch (4 for the NSR, 2 for the line cutters)

dsigma commented 9 years ago

@andrewgreenberg, can you order these?

andrewgreenberg commented 9 years ago

@dsigma: kind of? My ATF license has long since expired, so I can't order J-TEKs. Luckily MJG now has an unlicensed brand of ematches: https://electricmatch.com/products/see/6/mjg-firewire-initiator

They look exactly similar, and have extremely similar characteristics:

 Igniter type                        Firewire      J-TEK
 Bridgewire Resistance               1± 0.2 ohms    1± 0.2 ohms
 Maximum No-Fire Current              300 mA        300 mA
 Minimum All-Fire Current             600 mA        750 mA
 Recommended Minimum Firing Current   750 mA       1.00 A
 Recommended Nominal Firing Current  1.00 A        1.25 A
 Maximum Test Current                  40 mA         40 mA

... so I believe they're a direct 1:1 replacement for the J-TEK. Closing this issue!

dsigma commented 9 years ago

I don't like the idea of doing a last minute swap of e-matches on a system as critical as recovery. The electrical properties may be the same, but how about the thermal and burn properties? I'd rather use J-Tek's if we can find them locally. I'll ask around...

andrewgreenberg commented 9 years ago

Again, I'm not really worried about this because it's so clearly the same thing. That said, please do ask around. It may be that some OROC members have spare J-TEKs, and we only need 6 more for this project. Sorry I can't be more helpful.