#71
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I'm with SEL....but would be most interested in motors that can't be had from the big E....these "hybrids" sound really interesting.
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Bernard Cawley NAR 89040 L1 - Life Member SAM 0061 AMA 42160 KG7AIE |
#72
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Quote:
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Paul If we weren't all crazy, we would go insane - Jimmy Buffett NAR #87246 www.wooshrocketry.org |
#73
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Doug .
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YORF member #11 |
#74
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29mm engines
I am still working on the Ex numbers and decided to put the 29mm back in. It turns out our current machine will make 29mm engines up to 3.25" long. It will take a totally new machine to go over 3.25" (bummer!)
I had missed the fact that Centuri bought the Coaster engine machine that made 1.0625" (27mm) x 8" long engines and sold them for a short while and then changed over to 1.125" (29mm) x 7.75" and 4.75". There was quite an evolution over a few year period. 1963 1.062" x 8" F11-3 49N-sec It and 54 sec Isp (low grade BP) same as Coaster 20lb 1964 1965 1966 1.062" x 8" F11-3 49 N-sec It and 54 sec Isp (still low grade BP ) called Hercules 1.062" x 5" E3.3-2 29 N-sec It and still low Isp called Atlas 1967 1.125" x 7.75" F14-4 37 N-sec It and 65 sec Isp ( higher grade BP) now called MINI-MAX 'PB' 1.125" x 4.75" E3.5-4 25 N-sec and 64 sec Isp now called MINI-MAX 'PB' 1969 1.125" x 7.75" F94-4 52.5 N-sec It and 85 sec Isp (highest grade BP) (metric labelling) 1.125" x 4.75" E7-4 25 N-sec and 54 sec Isp (large throat) 1971 1.125" x 7.75" F16-4 57.8 N-sec It and 94 sec Isp (highest grade BP) End burning 1.125" x 4.75" E15-4 39.6 N-sec and 83 sec Isp 1972 replaced by Enerjets, new case sizes are 1.125" x 3" and 5" The LT-110 was the engine tube for the early Coaster engines and was replaced by the LT-115 for the 29mm engines and Enerjets. The new engine survey shows some decision points. The 3/4E21 at 26 N-sec is the largest with 30.0 g or less of propellant. So all the 29mm engines in the 2.75" long casing would be able to be mailed via USPS ground with no additional charges. The full E20 at 3.25" and the 3/4F19 would have to be shipped with HAZMAT. The 3/4F19 at 62.5 g of propellant would be the largest we would ever make. The BATFE discussions we have had made us decide to never go more than 62.5g. We would have to sell them to certified users only, HAZMAT fees, and track each engine from cradle to grave. As long as we keep each engine under 62.5 g, we only track them until they are produced. Once they are packed in the casings, the BATF has no further interest in the BP or the engines. Let us know what you think about the 29mm engines.
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Carl McLawhorn NAR#4717 L2 semroc.com |
#75
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They sound like a lot of fun. I will definitely try several of them in my SLS Brighton and be standing by for more kits from Semroc to use them in. |
#76
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The 29mm motors sound good, Carl.
Make some up and I will place an order.
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Bob S.A.M. # 0014 |
#77
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The ¾E21 (-0) sounds perfect for one of my stagers that turned out to be too much for the lone D12-0 in the booster. So, yeah, bring 'em on!! [Edit: I'll build a new booster just for that motor.] Doug .
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YORF member #11 |
#78
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The 29mm motors sound great.
They don't sound like those wimpy-thrust "coming soon FOREVER" Thunderjets that I'm convinced have become vaporware after showing at trade shows.... Make sure you can do tham at a reasonable price point.... Any idea WHEN we are going to be able to get our paws on ANY Semroc engines ????
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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 ! |
#79
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Since the projected annual sales figures from the Engine Survey are only about $17K from SAM's, we can't afford to spend the time on engines that we would like to. We work on them when we get free time, but it is rare right now. We hope when the economy gets better, we will be able to burn off some inventory to help finance engines.
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Carl McLawhorn NAR#4717 L2 semroc.com |
#80
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Carl,
Totally understand. You being gracious enough to give us an explanation is more than any other company ever cares to do. Just another reason Semroc is #1 with ZERO close competition in my book. You and your entire team DO IT RIGHT !!! I offer to 'beta test' any engines you find needing 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 ! |
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