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TOPIC: Making Rapier type Motors in the US

Making Rapier type Motors in the US 3 years 10 months ago #12

  • jetexpropulsionlab
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  • Dr Edward Jones
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Humor me a bit here, please, my old-school ways don't convert rapidly. With regards to good, old-fashion Jetex wick, in the little round tins, please might we show a bit of respect and say a good word (or three) about the goodness and positive aspects of that fine work of wizardry by Imperial Chemical Industries and Dyno Nobel (Sweden)?

There will be a dozen reasons why Jetex wick wasn't good, but, for the sake of conversation, might we look to the good things it offered?

There's method to this madness. I'm developing a new line of Rapier-type prototype motors, and re-invented Jetex pellets. While the 21st century folk are ready, will, and able to switch to electric probe hot-wire ignition, for the moment I've decided to so how far I can go with real, honest-to-goodness Jetex-type (and Rapier-type) fuse!

What do you like about Jetex wick and Rapier fuse? What's good about it that I might seek to replicate?

Comments from folks with Jetex- and Rapier-burned fingers reading this?

Dr. Edward Jones, in Mojave CA

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Making Rapier type Motors in the US 3 years 10 months ago #14

  • andyblackwell
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Good Question;

Ok, firstly it comes in a yard length which means you can vary the size of wick you want meaning less waste and more efficiency. Secondly the tin is readily identifiable in a messy tool box. Thirdly the wick itself always has the 'triangle of fire' built into it, fuel, oxidiser and heat transfer via the copper wire meaning you can light the fuel through the tightest atom 35 orifice. It is also great for firing up Rapiers through the cough and fart stage when the cautery tool won't go deep enough.
Yes, there is much to be said for it.

Andy.

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Making Rapier type Motors in the US 3 years 10 months ago #18

  • jetexpropulsionlab
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AND, Lordy Lordy Lordy, is that fine Jetex 'wick' hard to fabricate. As far as I can tell, at most, ICI had one tool setup to make it in Scotland, and the production was never smooth. Rumor has it that ICI sent that production task to their wholly-owned Swedish facility, Dyno Nobel. And they soon quit production, since costs far exceeded revenues. And hope springs eternal, so I continue to fiddle with the notion here at JPL, though the majority will probably (wisely) go for hot-wire electric probes. Thanks for the comments, Andy. Edward in Mojave.

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Making Rapier type Motors in the US 3 years 10 months ago #22

  • rogersimmonds
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Hi Edward and guys,

Andy says it all about the good Jetex fuse. Jet-X fuse is pretty good too. See my blog, though, about the problems with old fuse - like some of the stuff on eBay.
www.jetex.org/jetex-blog/entry/one-rule-for-one.html

But for igniting Rapiers these days, we tend to use a cauterizing tool - secure fire up and less spitting of fire to set light to your model! :cheer:

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