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- Newsgroups: rec.models.rockets
- Path: sparky!uunet!cs.utexas.edu!uwm.edu!linac!att!cbnewsc!cbfsb!hrbob
- From: hrbob@ixstar.ih.att.com (R.E. Wiersbe)
- Subject: Re: Question about electronic ejection control
- Message-ID: <1993Jan22.225522.14973@cbfsb.cb.att.com>
- Originator: news@cbnewsb.cb.att.com
- Sender: news@cbfsb.cb.att.com
- Nntp-Posting-Host: ixstar-g.ih.att.com
- Organization: AT&T Bell Laboratories
- References: <1993Jan22.172703.15050@rsd0.rsd.dl.nec.com>
- Distribution: usa
- Date: Fri, 22 Jan 1993 22:55:22 GMT
- Lines: 39
-
- In article <1993Jan22.172703.15050@rsd0.rsd.dl.nec.com> buzz@rsd.dl.nec.com (Buzz McDermott) writes:
- >I would like to build an electronic ejection control system into my next
- >rocket. I want the ability to set varying ejection delays based on
- >different motors and vehicle weights.
- >
- >I've seen mention of and advertisements for electronic timers that may be used
- >to control custom ejection delays. I understand that these are hooked to
- >a capacitor or battery as a source of power for an electric match or
- >flashbulb. What gets fuzzy after that is exactly what is used to provide
- >the ejection change itself. Do you use black powder in some type of container,
- >which you ignite via the pulse from the capacitor/timer?
- >
- >I'm interested in construction details, parts requirments, sources for the
- >black powder, alternatives to explosive ejection systems (if any), etc.
- >
- >Have there been any construction articles in _Tripolitan/HPM_ or _AmSpam_?
- >
- >Are there commercial products available?
- >
- >Any and all help is greatly appreciated.
- >
- >================================================================================
- >= Buzz McDermott Disclaimer: I speak for no one but myself, and =
- >= buzz@rsd.dl.nec.com anyone who listens to anything I =
- >= NAR 13559 have to say deserves whatever they =
- >= TRA 1785 get!! =
- >================================================================================
-
- Robbie's Rockets makes ejection charges in various sizes for different diameter
- rockets. Basically, it's a flashbulb and black powder in a tube. They should be
- listed in the Manufacturers listing from Mike Jungclas. If not, I'll look for
- the catalog I have. (They were giving out free samples at Danville last year, I
- got one of the smaller ones, but haven't used it yet.)
-
- The flashbulb gets ignited by whatever electrical device you supply (timer board,
- switch, etc.). Most of the electronic timers use a 9V battery. I would suggest
- getting an Adept and Robbie's Rockets catalog.
-
- Bob Wiersbe hrbob@ihlpb.att.com NAR# 44588
-