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- Newsgroups: rec.models.rockets
- Path: sparky!uunet!usc!sdd.hp.com!hp-cv!hp-pcd!hpcvaac!billn
- From: billn@hpcvaac.cv.hp.com (bill nelson)
- Subject: Re: Igniters
- Message-ID: <1993Jan22.171306.10814@hpcvaac.cv.hp.com>
- Organization: Hewlett-Packard Company, Corvallis, Oregon USA
- References: <634@rml.UUCP>
- Date: Fri, 22 Jan 1993 17:13:06 GMT
- Lines: 42
-
- jack@rml.UUCP (jack hagerty) writes:
-
- ... delided ...
-
- : 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?)
-
- I missed your tirade, sorry about that.
-
- : 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!
-
- Well, he did vary the current - he just didn't measure it. The current
- changed every time the voltage was changed.
-
- I think he was talking about having to immerse an ignitor in water to determine
- the calorific output - that is obviously nonsense. I do not recall him ever
- stating that any such test was actually performed.
-
- : 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.
-
- Hopefully, the NAR will not see fit to republish the thing anywhere.
-
- Anything of any use in the articles, you could easily obtain by making a
- 5 minute phone call to the manufacturer.
-
- Bill
-