#1
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estes saturn v on a d12 ?
Has anyone tried to launch a new estes saturn v on an estes d12-3? final weight of mine with motor is 14.25 oz. their recommended max liftoff wight is 14 oz. will probably go with the new e20-4 or an e15-4, just wondering what others experiences are.
wick |
#2
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Do not fire it with a D-12 anything!!! You will probably be picking up the pieces after it traveled maybe 120ft upwards. You have to build it extremely light to be able to use a D12, but even then, the altitude is marginal.
You have the right idea: use an E15 or 20 or 30. An F engine may also be used, but you may need a little nose weight. I'm sure more folks will chime in with their experiences, but I would not use a D. Allen |
#3
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An Estes Saturn V flown with a D12-3 even if built to cataolgued unrealistic weight will turn in a flight that can be described with one, and ONLY ONE word, L-A-M-E-O !
A typical weight 1/100 Estes Saturn V will be lucky to hit 100' on a D12-3. They should either have a 3X24mm cluster in this kit or a 29mm mount. I'm putting the upgrade kit from Commonwealth in my latest Saturn V that includes a 29mm mount, upgraded recovery, and upgraded fins. A 24mm F24W RMS reload will be the lowest impulse it EVER flies on. Most likely first Flight will be a 29mm F50.
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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 ! |
#4
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Consider that both the original K-36 Saturn V, and the Centuri Saturn V (on which the current one is based) were both designed for a cluster of three C6-3 motors. That is around 27-28 (actual) ns, and a liftoff thrust of 42n.
Then consider a lone D12 motor only has 17ns at the most, and a liftoff thrust of 30n. The 3-C version will weigh about 1-1.5 oz heavier, but all-in-all, will still perform a lot better.
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Roy nar12605 |
#5
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Move the thrust ring up and go with a long 24mm. A D-12 is pretty much suicide by gravity
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Gravity is a harsh mistress SAM 002 NAR 91005 "The complexity of living is eminently favored to the simplicity of not." |
#6
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I always thought a Saturn V would fly nicely on a pair of D-12's.
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"AND I hope they are from the planet of the "Chunk spunky Mary-Lou Retton clones". - Ironnerd "Those who trade liberty for security have neither" - Benjamin Franklin "Semroc is almost always the answer" - Stefanj www.paulsavia.com www.soundclick.com/paulsavia |
#7
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I honestly dont ever see myself building one but if I did I would build it 5x24mm. If you are going to cluster, I figure you oughta use five motors like the real thing. Even C11s would be more realistic lift off due to the bigger throat and more smoke. I think the thin flame out of a C6 would look too wimpy through a camera. Ultimately five Es would be best in my opinion but never even seen one fly so I'm guestimating.
(had to edit due to brain fart. Saturn V was five motors, not four...duh) Last edited by El Cheapo : 08-31-2011 at 03:30 PM. |
#8
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The only problem with flying a single D12-3 is wind. Winds 5 mph or under are not a problem. We've flown our single engine (14.7 ounces fully prepped) Saturn V 18 times over the last decade and the only scratches it has are from transporting it to the field.
To me the engine selection for a Saturn V depends on the effect you're going for or the size of the field. A single engine can be flown on most school yards for class demos. If you want to go for the 5 engine effect there are several engine combinations. I like ours the best on a D12 and 4 A8-3's when the winds are under 8mph, I like a D12 and 4 C's if under 12mph. I have considered 5 D's for the next one we build but would stay away from 5 E's because I've seen too many E catos. FWIW, I consider a 5 E cluster to be more of a risk than a single D-12 but as they say, no guts, no glory. Randy www.vernarockets.com |
#9
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Quote:
Well, it might be more of an eye of the beholder thing. Our friend Russell Cummins has an ancient Saturn 1b (from the '70's, which accounts for its charmed patina) that he likes to fly on a cluster of four C6's. It always does a nice job, and draws a lot of attention at each launch when he flies it.
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John YORF #003 SAM #004 |
#10
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Quote:
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Black Shire--Draft horse in human form, model rocketeer, occasional mystic, and writer, see: http://www.lulu.com/content/paperba...an-form/8075185 http://www.lulu.com/product/cd/what...of-2%29/6122050 http://www.lulu.com/product/cd/what...of-2%29/6126511 All of my book proceeds go to the Northcote Heavy Horse Centre www.northcotehorses.com. NAR #54895 SR |
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