#11
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Carl,
You mentioned that the casing walls are holding up to the burn. Will a six-second delay burn possibly cause too much erosion? I know that it is dynamically less damaging, I was just thinking about the heat. Perhaps the char from the propellant burn will provide some heat protection. Guess you'll just have to make and test a few. Chas |
#12
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A 6-second A? I'll fly a bunch, but am not sure I've got the attention span to track anything that flies on one of your C's when you release them. You'll certainly never get these into Wal-Mart, so that Estes acquisition might not be such a hot idea. |
#13
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__________________
Carl McLawhorn NAR#4717 L2 semroc.com |
#14
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Carl McLawhorn NAR#4717 L2 semroc.com |
#15
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I am looking at a 2 second delay before the actual burn for an upper stage engine. The booster would ignite the upper stage, then drop off. The sustainer would produce just enough gas to drop the base pressure for 2 seconds or so to allow it to act as a boosted dart, then after the velocity burns off some, the actual burn would start. For B altitude, I have always wondered if this would help. I was working on that with 13mm engines in the early 70's when the rug got pulled. I suppose I could fly the combination in Rocksim, but it is not the same without the sulfur smell.
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Carl McLawhorn NAR#4717 L2 semroc.com |
#16
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Rocket simulations - who needs 'em? The guy over in the "Ask Mike" forum said that HE don't need no stinkin' sim program, so why should any of the REST of us use one! Simulation software - feh! Just set them up on Semroc's remote corporate rocket range, retreat into the heavily-reinforced blockhouse that you have on site, press the button, and see what happens! MarkII
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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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#17
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When Telex hired me in 1971 as a final test technician, I convinced the guy in personnel that I knew a lot about logic design because I had read a few books. I aced the test and started the next day. My new supervisor told me that my oscilloscope was on order. I told him, essentially, that i did not need no stinking scope; I could see ones and zeros with a meter, if he just told me how many volts a zero was and how many volts a one was. He went over to his office, pulled a few hairs out, and came back and asked me if the guy that hired me had told me about the 90 day probation period. He suggested that if I really did not know how to use a scope, I had better learn pretty D**N quick. From that point on, I have always been willing to add any new tool to my toolbox and learn how to use it. All the people that I worked for initially and that I supervised later were stuck in the same groove of "I don't need anything that I did not have 20 years ago." I can look at a box and tell you how much it weighs, but the post office prefers that I use a "stinkin" scale as a cross-check!
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Carl McLawhorn NAR#4717 L2 semroc.com |
#18
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Being one of the primary targets of that short-range tactical strike I thought it was kinda funny, too. Sad, but funny... Carl, what sort of final weights (with delay charges loaded) are you expecting the complete engine to reach? I'm trying to force-feed your numbers into the RockSim engine editor, so I can start excessively relying on my simulations of this engine.
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Craig McGraw BARCLONE Rocketry -- http://barclone.rocketshoppe.com BARCLONE Blogsite -- http://barclone.wordpress.com BARCLONE Forum -- BARCLONE Forum BARs helping BARs SAM 0044 AMA 352635 |
#19
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Casing and nozzle 1.5g BP for A 3.3g Delay 5 sec 1.0g E/C & cap .7g So: A1.5-0 about 4.8g + about .3g extra BP for blow-through A1.5-5 about 6.5g 2-A1.5-5 about 6.9g (2 second delay before BP) Booster will probably have larger spike than sustainer.
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Carl McLawhorn NAR#4717 L2 semroc.com |
#20
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Thanks, Carl!
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Craig McGraw BARCLONE Rocketry -- http://barclone.rocketshoppe.com BARCLONE Blogsite -- http://barclone.wordpress.com BARCLONE Forum -- BARCLONE Forum BARs helping BARs SAM 0044 AMA 352635 |
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