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Model Forum / General / Rockets / August 2004igniters
I am curious why people have moved away from using shavings from motor propellant to make igniters. I recall reading where rocketeers use to make igniters by wrapping a little nichrome wire around a piece of propellant cut from an AP grain. Cost why, it is cheap and it is easy too. I tried it and the flame is more than enough to ignite any motor. One F motor grain can make an awful lot of matches. It seems this type of match making has disappeared as an alternative to buying pryogens and dipping matches or buying matches. In my experience, it's more reliable and actually easier to use a dipped igniter. With the shaved grain type, one must sheath the nichrome wire or a short is highly likely. Also, it takes a good deal more current to fire nichrome than it does to light the majority of dipped igniters. If one clusters AP motors one desires the most efficient (mechanically speaking) igniter available.  SignatureR. J. Talley Teacher/James Madison Fellow NAR #69594 NRA #133073736 > I am curious why people have moved away from using shavings from motor > propellant to make igniters. I recall reading where rocketeers use to make [quoted text clipped - 4 lines] > disappeared as an alternative to buying pryogens and dipping matches or > buying matches. The way I saw it done was one lead was shorter than the other. The nichrome was wrapped around the lower lead the sliver of propellant placed on the longer lead and the nichrome wrapped around the sliver and the longer lead until it reached the exposed wire on the longer lead. This basically prevented any shorts. The time to ignite didn't seem much different from other matches. It is interesting. I wonder if the perception is worse than the reality? > In my experience, it's more reliable and actually easier to use a dipped > igniter. With the shaved grain type, one must sheath the nichrome wire or a [quoted text clipped - 12 lines] > > disappeared as an alternative to buying pryogens and dipping matches or > > buying matches. |
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