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Missile Works RRC2+ Deployment Initiators for rocketry 2 months 3 weeks ago #3276

Allan: where do you get your deployment initiators for your RRC equipped dual deploy HPR's? I am building the bay for my (second) rebuild of the 75mm Renegade and it will be equipped with the RRC2+, a 38 mount scrounged from the Mini-Magg crash : P, etc.

Also was looking at batteries - Missile Works recs 9V Alkaline so I found the site below with battery tests.

www.powerstream.com/9V-Alkaline-tests.htm

The "nuon" in the tests isn't available in alkaline so the Energizer Industrial looks best.

Cheers / Robert
Cheers / Robert

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Last edit: by Robert Bantly. Reason: change

Missile Works RRC2+ E-Match source 2 months 3 weeks ago #3277

Robert, I got my last box of the MJG Technologies Firewire Initiators (I-TEK-3) from a vendor at the NARAM in 2019. A box has 80 in it. There is a website & phone # listed on the box www.electricmatch.com and 856-228-6118. I don't remember the vendor from NARAM or where I got a prior box back in 2016. (The very first box I got, they had a quality problem and the manufacturer replaced my defective lot with another box of good ones.) Since then, I've not had any failures with them. Lee may have some to purchase.
Since the RF folks recommend Duracells, I've been using them. While not the best specs as you've found, what I've been told is that the individual cells in the battery are better attached than the others (which is needed in high G applications.) For my GPS' and flight computers, I'm using 2cell LIPo's.
Also, I check the continuity of each initiator before putting in the 4F charge. The Firewires run between 1 to 2 ohms.

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Last edit: by Allan Howard.

Missile Works RRC2+ Deployment Initiators for rocketry 2 months 2 weeks ago #3278

Firewire is available at Apogee - $18.95 for 'six.' Sigh. However, they have a dip yer own kit that is supposed to make 80 I ordered one pack of pre-mades and the make your own kit, links below.

www.apogeerockets.com/Rocket-Motors/Moto...ewire-Initiator-6-pk

Should be enough to get me to L3 eventually. 

OK on the Duracell, will look for some nice new ones. Plan is to use a battery for 2 flights - then put them in the smoke alarm pile haha.

I have some 500mAH 2S LiPo's and these would work with the RRC2+ but a short will destroy the board - the cell is rated 20C so it'll deliver 10 amps.

Final question...drum roll...how do you ground test an RRC2+??? Instructions say to do it but not how...

Cheers / Robert

 
Cheers / Robert

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Last edit: by Robert Bantly.

Missile Works RRC2+ E-Match source 2 months 2 weeks ago #3279

Some more comments....
For all but one of my 4" diameter and larger rockets, I use redundancy. I use a RRC2+ as a backup and a Stratologger CF as the primary (so a total of 4 charges in each rocket, 2 for drogue and 2 for main). I've had great agreement between the two altimeters. I was using Quest Q2's for the primary charges because I had 100% failures with the bad batch of Firewires. The Firewires showed continuity but the chemicals were out of spec and didn't work. As I said before, MJG replaced those and I've not had problems since. I had bought several bulk packs of Quest A6-4's and C6-3's just to get the ignitors. I only have 2 left so have been using FIrewires in all. The primary altimeter is set at apogee and then the backup at apogee + 1 sec. For the main, I set the primary to 600' and backup at 500' for most flights. Bigger rockets I set higher.
BTW...I use a Firewire for upper stage ignition which is controlled by an Eggtimer Proton with a LiPo (when armed).
On the 9v batteries, I always test voltage before use. I only use them one or two times so I, too, have a big bag of batteries for smoke alarms. When I use them once, I tape a note to that effect on the battery. Usually the 'used' batteries are placed in the backup altimeter.
To ground test, I just test the charge effect along with the shear pin configuration. I just use a manual switch with a 9v to fire in the yard. I rely on the beeping once I put the payload bay together before putting in the rocket at home. Then at launch I listen for the beeping patterns one after the other. 

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Last edit: by Allan Howard.

Missile Works RRC2+ E-Match source 2 months 2 weeks ago #3280

Some altimeters allow you to test the charge(s) directly. You need the interface cable and program to do that with the RRC3 and Stratologger CF. While I have those, I haven't done it that way. Eggtimer stuff also allows direct testing. I've only tested functionality with old Christmas tree lights in a vacuum bottle. That way I can see that the Eggtimer is "firing" as appropriate at apogee and main "altitudes".

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Missile Works RRC2+ Deployment Initiators for rocketry 2 months 2 weeks ago #3281

Will ground test - I have a spent 38 I can run wires through. As far as testing the actual altimeter, the 2+ doesn't seem to support it. This is a 75mm cardboard rocket so double redundancy probably isn't doable given space.
Will set up for motor ejection + drogue/apogee charge so that for certain she's separated and on drogue for the way down.
Will also optest matches with a 9V battery. Since I can't directly test the RRC2+ will have to rely on the POST test to ensure operation : /

Cheers / Robert
Cheers / Robert

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Last edit: by Robert Bantly.
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