home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!cs.utexas.edu!uwm.edu!lll-winken!rml!jack
- From: jack@rml.UUCP (jack hagerty)
- Newsgroups: rec.models.rockets
- Subject: Re: Igniters
- Message-ID: <634@rml.UUCP>
- Date: 22 Jan 93 01:21:25 GMT
- References: <19930120183828.Roger.Wilfong@umich.edu> <1993Jan21.010654.3022@hpcvaac.cv.hp.com>
- Reply-To: jack@rml.UUCP (jack hagerty)
- Organization: Robotic Midwives, Ltd.
- Lines: 49
-
- In article <1993Jan21.010654.3022@hpcvaac.cv.hp.com> billn@hpcvaac.cv.hp.com (bill nelson) writes:
- >Roger.Wilfong@umich.edu (Roger Wilfong) writes:
-
- [talking about AmSpam "ignitor" article]
-
- >: It was the lack of that information that disapointed me.
- >
- >Agreed - the research was very poorly conducted. The person also did not
- >seem to know too much about thermodynamics. I would have been interested
- >in the energy output curves.
- >
- >It would also have been nice if the person had done some testing of just
- >how fragile the various igniters were.
- >
- >All in all, I found the articles rather useless.
-
- I think you guys have both picked up on my main complaint about Douglas
- Kirk, M.S., Directory of the Model Rocket Test Facility (tm) that I
- moaned about in my tirade a couple of weeks ago. (Said tirade, BTW, was
- almost universally ingnored by this group. Whatsa matter, can't be
- bothered by such small fry?)
-
- Mr. Kirk apparently conducted his "research" based not on any study to
- determine what parameters made an ignitor work, but rather on what tests
- he was able to perform.
-
- Why did he vary the voltage and not the current? Because he could! Why didn't
- he vary the current? Because he couldn't! Does dipping an ignitor in plastic
- and firing it under water determine how well it can ignite a rocket motor?
- I don't know, but it was a good test!
-
- The thing that still gnaws at me is that this guy is passing himself off
- as an athority, and his "research" will probably be taken as gospel by
- the Grammar/High School age crowd which is still the main target of the
- NAR educational programs. When I saw the first installment, I was hoping
- for an article like Matt Steele's excellent study of black powder CATO's
- a few issues back. But when I saw the name at the top (and on all the
- captions, and tables, and sidebars) I just groaned.
-
- - Jack
-
- =============================================================================
- ||Jack Hagerty, Robotic Midwives, Ltd. jack@rml.com ||
- ||Livermore, CA NOTE! New, improved address! ^^^ ||
- ||(510) 455-1143 (old ones will still work) ||
- ||-------------------------------------------------------------------------||
- || "I'm sorry they're flying so low and jamming your radar, Dimitri, but ||
- || they're trained to do that. It's called, you know, initiative" ||
- =============================================================================
-