01-02-2007, 09:03 PM
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Junior ??? Rocketeer
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Join Date: Mar 2005
Location: Knightdale, NC
Posts: 1,470
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Originally Posted by CPMcGraw
What body tubes are available for the 15mm and 10mm motors? These look like they could generate some interesting models.
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None yet. The 10mm is the minimum allowed in FAI competition. The 15mm is a mid-size for B motors. Just a suggestion of possibility.
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Something I thought about as a possible sideline item -- Pre-packaged deployment charges (not delay chains) for use with electronic triggers, each with specific amounts of pyro, and with two firing ports (one at each end) for redundancy triggering. Not exactly what we'd be using with our smaller models, but possibly for some of those upper-end 29mm birds...
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The Ejection-only DECAP is a pre-packaged deployment charge.
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I see the DECAPs used for the 13mm and 10mm motors, but can this be adapted for the 18mm as well? Or does the pressure generated in the 18mm package exceed the limits for whatever adhesive/mechanical fixatives will be used?
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The 13mm DECAP glues inside an 18mm engine. The 10mm DECAP glues inside a 13mm engine. Probably a potential source of confusion.
The 13mm DECAP (for 18mm standard engines) will probably be the one we do. If it is popular, we might add the 10mm. One of the primary advantages of the DECAP is precision times. The accuracy of a standard engine is only as accurate as how much of the propellant "runs" up around the ram. The DECAP eliminates this variable. Another advantage is the ability to pick in-between times for models that don't fit the 2 second spread.
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Carl McLawhorn
NAR#4717 L2
semroc.com
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