Ejection charge question

[Bret PackardParticipant]

This is in regard to my SSSS bird. What do you guys use to hold your charges in min diameter birds? I was planning to go the christmas tree bulb method as shown on the perfectflite website http://68.178.208.82/cgi/PF_Store/perlshop.cgi?ACTION=thispage&thispage=ECK6.html&ORDER_ID=306161098 but I am concerned about them falling apart under the high G loads. Should I just go with a conventional setup a small pvc cap instead? Just wondering what all you altitude guys have tried. I just have no experience with flights that have the acceleration that this one will have. Thanks for any suggestions.[/list]

[Ed Dawson]

I have really had good luck with an ematch and a finger of a latex or nitrile glove filled with the BP charge. I tape the finger onto the ematch wire with electrical tape and if can fit anywhere.

Sice its a soft cofiguration there is nothing to come apart and there will always be O2 inside the latex finger independent of the altitude.

One other note, you should always give a good tug on the wires to make sure they won’t come out of the screw terminals of the altimeter.

[Anonymous]

Bret, Ed’s method is very sound. Another thing that I have done is to use the corner of a sandwich bag.

Good luck! Glad to see you going for some altitude!

JW

[Warren B. MusselmanModerator]

I’d be extremely leery of christmas bulbs on high thrust rockets. My 2 cents… Personally I’ve gone over 100% to surgical rubber tubing for all my charges and I stick with e-matches.

Warren

[Kevin OslerParticipant]

OK, I am almost to the point on this HyperLOC 1600 project where I can venture in to the unknown and deal with Altimeters and ejection charges. I found some good articles on building ejection charges and wiring up the altimeters (even though I am really going to bug you guys at MHM to make sure I got it right). I just ordered the RRC2-mini altimeter but where can I get some e-matches to fine tune the ejection charges with prior to the MHM event? Any ideas?

[Warren B. MusselmanModerator]

I’ll be happy to help you out. If you’re coming to the cleaning party tomorrow, PM me and let me know and I’ll throw a couple in the car. Otherwise, since you’re in Longmont, feel free to contact me and we can cross paths at my house and I’ll get you a couple.

Warren

[Dr. Michael Sutter DC]

So I have heard plastic baggie corner from Joe, Warren loves Surgical hose, and a tip of a rubber glove…. can these work in any type of rocket?

i mean I have a duel deploy 4″wide rocket(hyperloc 835) that im going to try and launch with its altimeter and it has a ebay… but instead of making BP cups and attach them to the ebay can I just use the “glove, hose, baggie method”? and let it sit at the bottom of the respected bulk heads and pop when the alt says?

this could potentially make my life a lot easier in the building what I need (probably sounds like the lazy way)

[Ed Dawson]

Yea, I’d do that if I were you. If your worried about them floppy around just tape the leads close to your eye bolt.

It is simple and easy.

The more important thing to do is checking the leads where they attach to the screw terminals on the altimeter. Give them a good tug to make sure they are firmly attached and will not fall out with excessive G loads or deployment shocks.

[edwardModerator]

I use the surgical tubing method. I just wrap the wires around my eyenut and put the charge in the eye of the eyenut. That way it doesn’t move around a whole lot or get pushed to one side. Always worked for me!

Edward

[MikeSModerator]

I dip my bulb in a little bit of ‘Quick Burst’ quick dip. Not
much, just enough to and stregth at the cross wire.

[Author]

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