#21
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I cloned a Midget about ten years ago, but had terrible luck with it.
Once, the upper stage did not ignite and the upper stage crunched. I rebuilt it. The next time, staging occurred, but the lower stage didn't separate. The sustainer thrust cooked the inside of the booster, and the thrust was insufficient and the model pranged again. I still have the wreckage. I don't know what to do with it.
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NAR #27085 - Oregon Rocketry - SAM |
#22
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Delayed separation may very well have been the culprit. Some of the old competitors might need to chime in, though. I've heard that some competitors glued two motors together to gain performance in contests, which was soon outlawed.
Another possibility might be that you accidentally used an 1/2A6-2 motor as a booster. I've heard that ejection charges will ignite an upper stage, but I've never tried it. Delay trains do produce a small flame, which might be mistaken for the sustaining phase of a booster when viewed at very low altitudes.
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I love sanding. |
#23
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That would make sense. .
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I love sanding. |
#24
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That's what I was wondering. You should be worried. We're thinking alike.
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Bill Eichelberger NAR 79563 http://wallyum.blogspot.com/ I miss being SAM 0058 Build floor: Estes - Low Boom SST Semroc - Marauder, Shrike, SST Shuttle In paint: Canaroc Starfighter Scorpion Centuri Mini Dactyl Estes F-22 Air Superiority Fighter, Multi-Roc, Solar Sailer II, Xarconian Cruiser Semroc Cyber III Ready to fly: Estes - Solar Sailer II Semroc - Earmark |
#25
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Daddy like!
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-Brain SKY AYE ROCKETRY Follow Your Impulse! |
#26
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In the end we all survived the experience with our relationships toward each other intact. It was a source of conflict for awhile, but we got over it. A lot of things about the 1960s ended up like that.
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Mark S. Kulka NAR #86134 L1,_ASTRE #471_Adirondack Mountains, NY
Opinions Unfettered by Logic • Advice Unsullied by Erudition • Rocketry Without Pity
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#27
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I could barely afford the hobby back then and the motors were the most expensive item for me. No hobby shops carried them at the time so I had to get all of mine direct from Estes. An order from me would typically include two or three individual motors, all different from each other. I only made a handful of launches each year. I had planned this launch for quite some time. If it had been burning a delay after the initial upward travel the rocket most likely would have continued on an arc and come down nose first. In order for it to display the slow, stable backsliding descent there had to have been some trust coming out of the nozzle.
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Mark S. Kulka NAR #86134 L1,_ASTRE #471_Adirondack Mountains, NY
Opinions Unfettered by Logic • Advice Unsullied by Erudition • Rocketry Without Pity
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#28
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Not necessarily. I've had dozens of flights where rockets flew vertical and backslid during delay before ejecting. It's all about vertical flight, calm air, and going without thrust long enough to stop climbing. I've got a couple that I can guarantee backsliding in calm air. However, if your motors were old enough to have the paper cap and you noted it wasn't there, then you didn't use the wrong motor.
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I love sanding. |
#29
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Yes, this occurred back in 1970. The motors were purchased in 1969, so they were definitely old-style.
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Mark S. Kulka NAR #86134 L1,_ASTRE #471_Adirondack Mountains, NY
Opinions Unfettered by Logic • Advice Unsullied by Erudition • Rocketry Without Pity
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#30
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I thought the instructions (K-40) called for an aft thrust ring in the booster which ensures stage separation. Or did you build the Mini Brute version (EST0840)? I don't think that one had the rear ring in the booster. On my clones, I've always included that. It's a major bummer to fry a booster. Doug .
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YORF member #11 |
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