#11
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Attached is my completed simulation of the Estes K-36 Saturn V kit. For an accurate simulation you will need to remove either the plastic fin set or the balsa fin set depending on which configuration you are using. The engine shrouds are simulated as one conical transition with its diameter set to that of the maximum radial distance from the center at the end of the engine shrouds.
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Bruce S. Levison, NAR #69055 |
#12
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Clear plastic fins on anything just plain SUCK.
Use enough nose weight to fly with SCALE fins.
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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 ! |
#13
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Instead of added nose weight you could possibly use induction stabilization: https://www.apogeerockets.com/educa...wsletter379.pdf
Blackshire informed me about this possibility and I am planning on building one of these finless missiles http://usnavymuseum.org/photos/SLBMs.asp to test out this concept.
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Bruce S. Levison, NAR #69055 |
#14
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Thanks.
Unfortunately OpenRocket can't attach the free form fin set to the transition so the fins aren't included.
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I love sanding. |
#15
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Quote:
I created the attached OpenRocket file for the out of production Estes Saturn V K36 with both the plastic and balsawood fin sets. Remove one or the other fin set as desired. Can someone with more OpenRocket experience especially with clustering motors please check this simulation? Thanks,
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Bruce S. Levison, NAR #69055 |
#16
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Quote:
The .ork file worked. It looks like I could do a lot of different things with the K36 if I use the clear fins. It really kicks the CP on back there.
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I love sanding. |
#17
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Little over 10 years ago I flew my vintage Centuri Saturn - V without the clear slip on fins; added some Play Doh in the nose area (Service Module bodytube) to bring the CG forward more. Flown down at Needville, TX using three C6-3's, the boost was a bit squirrely, but as can be seen in this video, straightened up after burnout and flew just fine.
https://youtu.be/0uTm-rbvQJk
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Dave, NAR # 21853 SR. |
#18
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Maybe 3 D21-4s would work better.
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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 ! |
#19
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Quote:
Which equals more tail weight and thus requires more nose weight to correct the CG/CP relationship... more nose weight means slower acceleration and more impulse required to achieve a given level of performance (speed/altitude). Thus it can become a "vicious circle"... (similar to the Ares V debacle). Sometimes it's best to just make the fins a little bigger... Later! OL J R
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The X-87B Cruise Basselope-- THE Ultimate Weapon in the arsenal of Homeland Security and only $52 million per round! |
#20
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I made a better RockSim file with separate engine fairings and both the plastic and balsa fins. Be sure to only include whichever set you are flying with. This simulation contains pods so it won't work in OpenRocket.
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Bruce S. Levison, NAR #69055 Last edited by teflonrocketry1 : 02-28-2019 at 09:28 PM. |
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