#31
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But note one key diff: The narrow bore B14, which looks much like the B8, is still deeper, 0.75" versus 0.6". It has the same depth as the bigger bore B14's. OTOH, it could simply be the later B14 (in the pic) was formed on a pintle that had been worn down (eroded) by too many pressings, and then drilled. Or maybe the drill bit itself, assuming a two slope drill bit, had been worn down by too many drillings. (A bit with a long, narrow tip that also includes a wider cutter up the shank, sort of a like a bit in a countersinking mount, could be used to simultaneously drill the deep, narrow core while also widening and reshaping the nozzle. Such as bit could wear faster on the abrasive clay end thus resulting in the smaller nozzle openings while still maintaining the deep bore.) But I like the precursor idea better Doug .
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#32
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http://www.forums.rocketshoppe.com/...achmentid=10757
3 b3- rocket engine cores from 1967 by SEL also found this: http://www.forums.rocketshoppe.com/...54&postcount=62 the B.8 (old designation) was of course a B4 (new designation) Although MMI sold at as a B6...... Terry Dean
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"Old Rocketeer's don't die; they just go OOP".....unless you 3D print them. |
#33
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I find that picture to be very Hypnotoad-esque.
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#34
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My early B14 engines from '68 or '69 look almost exactly like those B3 nozzles that OBVIOUSLY have drilled cores.
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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, and HAVOC ! |
#35
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Doug .
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#36
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I had B3 motors with the thick walled casing (same as used in the classic 1/4A3, 1/2A6, A5 and B4 18mm motors). I flew them. They worked.
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-Fred Shecter NAR 20117 (L2) Southern California Rocket Association, NAR Section 430 |
#37
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Guys,
Can you give me an example of what you might have flown on a B14-7. I always think of the B14 as a heavy lift motor and I'm having trouble reconciling that with a 7 second delay. |
#38
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Estes recommended it as an upper-stage engine for the Apogee II, and the Delta when lifting the Camroc. For the Farside and Farside-X, they recommended the -6. Yes, they made a -5, -6, and -7! Centuri was a bit more liberal in recommending the B14-7 for its kits, listing it for their small, ST-7 (like Javelin) or ST-8 (like MX774) kits, but *not* for their multistagers!
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Roy nar12605 |
#39
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This is an interesting question, Gus. I can remember in my first go-round with modle rocketry circa 1967-1972, that I had B14 motors........ But I really don't have any memories of actually using any. I was not (and still am not) a very good modeler, and once I figured that out (which was within the first 2-3 kits), I basically just read the Model Rocketry magazine and collected kits and engines at NARAM-12 and NARAm-13. I know for sure that I spent at least $500 each visit and brought a lot of stuff back but never built it and it sat in a strage shed until the late 70's or early 80's when my mom moved and threw it all away. She did keep the MR magazined and gave them to me years later. In the 7th grade we had a rocketry "club: that consisted of a few people in the overall science club, and my neighborhood friends only came around to watch me launch and chase my rockets. They pushed the button sometimes but that was about it. There was no local hobby stores as I lived in a small rural town (pop. maybe 3,000) so I was basicially a lone rocketeer as a kid from 12-16. Sorry to get carried away. I know from my memory that I had 2 rnage boxes stocked full of modle rocket engines of all types purcahsed between 67-72... I would estaimate at least several hundred easily. Terry Dean
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"Old Rocketeer's don't die; they just go OOP".....unless you 3D print them. |
#40
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I flew the old B3-7 in my Centuri Javelin - what a neck snapper! Maybe that is the cause of the arthritis in my neck today
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