#31
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I stand by my original statements and re-state that this is NOT motor manufacturing and I could care less if it ALTERS the motor performance.
Even the agents at BATFE are SMART enough to surmise that gluing motors together no more constitutes motor manufacturing than taping them does. Pure horse-pucky to punish the innovative all in the mamby-pamby name of safety. Typical over-regulation....I would always rather have ZERO regulation than over-regulation, which is why I rarely join any sort of club or governing body...most have WAAAAAYYYYY too many rules/regs. There is a certain amount of risk involved in the hobby of rocketry....I'd just as soon accept that (part of the fun....no risk/danger=NO FUN) instead of constantly try to weed it out/reduce it.
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When in doubt, WHACK the GAS and DITCH the brake !!! Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't ! Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY. ALL systems are GO for MAYHEM, CHAOS, TURMOIL, FIASCOS, and HAVOC ! |
#32
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You're free to do this on your own. The restriction is at club launches. Nobody's gonna bust you for doing it at unsanctioned launches. (Although your NAR/TRA insurance will likely not cover this.) After reading about this the past 2 days, I'm inclined to glue a couple together just for a cheap thrill I'm thinking a C5-0S to a C6-5 in a Big Bertha. How's that sound? Doug .
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YORF member #11 |
#33
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I've done it with some B6-0/B6-6 and its definately a cheap thrill. with that combination Doug, you would probably get a burnthrough die to the combination of the two engines thrust durations being in excess of 2 seconds. terry dean
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"Old Rocketeer's don't die; they just go OOP".....unless you 3D print them. |
#34
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The nozzles should be identical. If the lower nozzle is larger it will have losses. if the lower nozzle is smaller it will overpressurize and fail. And, as stated, if your glue joint and/or sleeve (i.e your homemade casing into which you install 2 normal model rocket motors to create an uncertified device) is bad, it will fail at the joint. And then there is the burn through issue at the bottom....
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-Fred Shecter NAR 20117 (L2) Southern California Rocket Association, NAR Section 430 |
#35
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I tandemed a few motors back in the day, and don't remember ever using a sleeve over the joint. Most were just butt joined end to end; an A3-0T and A3-6T for B Payload at NARAM-20 IIRC.
The neat ones were sticking a A3-4T into a C6-0 to get into the D class for D BG and similar events. Or a D12-0 C6-3 for E class events. Around the same time as tandem motors, we had AVI "Gold" series motors that used delay ejection modules epoxied into the end of their motors. I made a neat F2412 tandem probably for a Dual Egglofter that I never fired, and is still in my collection somewhere. |
#36
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There have been lots of suggestions on getting started in staging with something less ambitious than a 3 stage rocket. Check out this Estes Plan from 1965 (the Augie II). I built this as a kid, and it was a blast to fly. I've toyed with upscaling this to a 24mm 2 stager. http://www.dars.org/jimz/eirp_28.htm
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Lee Reep NAR 55948 Projects: Semroc Saturn 1B, Ken Foss Designs Mini Satellite Interceptor In the Paint Shop: Nothing! Too cold! Launch-Ready: Farside-X, Maxi Honest John, Super Scamp |
#37
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That's the tandem motors I remember. Like a F100-0 / C6-7 tandem to make a baby F, or D20-0/ A3-6T . doubt I have any fired examples in the dead engine box, will have to dig and see. lol . ~ AL |
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