Revisit of a RockSim problem

Discussion in 'Plans' started by dinoburb, Apr 25, 2019.

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  1. Apr 25, 2019 #1

    dinoburb

    dinoburb

    dinoburb

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    Many years ago (~13) I asked how to simulate a rocket body that was pyramidal in shape. Life intervened and now I’m ReBAR, ReBorn Again Rocketeer!

    The sides are flat about 12” wide at the base and 3” at the peak. Length posited at 4’ or more.

    The original question was when RockSim was at version 8!

    I envision 4 trapezoidal shaped sides joined to create a long, thin pyramid shaped rocket body.

    Any ideas on how to accomplish this in RockSim or OR?
     
  2. Apr 25, 2019 #2

    Nytrunner

    Nytrunner

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  3. Apr 25, 2019 #3

    neil_w

    neil_w

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    There are two questions here:
    1. Can you simulate the behavior and performance of such a rocket? I assume that is the question being asked.
    2. Can you create a visual representation of such a rocket?
    And therefore two answers:
    1. Can't speak for Rocksim but I don't think there's any way to do it in OR, simple as that. My intuition would suggest that modeling the whole thing as a conical transition would be a decent approximation in calculating drag and CP, though it wouldn't be accounting for whatever weird turbulence occurs on the edges of the pyramid.
    2. With the upcoming OR release, I believe it would be possible, using certain outrageous techniques, to create something that looks like a pyramid. I'll give that a try when I get a chance, just for giggles. But it would be purely for appearance, and wouldn't simulate the behavior in any realistic way.
     
  4. Apr 25, 2019 #4

    K'Tesh

    K'Tesh

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    Here's what I've got... With OR, you *MIGHT* be able to. But *ONLY* if the angle is 15 degrees or less.
     
  5. Apr 25, 2019 #5

    neil_w

    neil_w

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    Yes, you are no doubt thinking of the same outrageous techniques as I am. ;)

    But again, it won't simulate, just make a pretty picture.
     
  6. Apr 25, 2019 #6

    K'Tesh

    K'Tesh

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    I should have added that part about "not simulating, just making a pretty picture".

    I'd have tried it already, if I hadn't accidentally spilled coke on my computer's touchpad last night... Now, I'm getting an error message that my USB port is taking more power than the port can give. I'm on my backup computer right now, and it hasn't been configured yet.
     
  7. Apr 26, 2019 #7

    neil_w

    neil_w

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    Torturing OpenRocket is fun for all ages!

    *Please note: this image is for entertainment purposes only.*

    upload_2019-4-25_21-20-20.png
     

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  8. Apr 26, 2019 #8

    dinoburb

    dinoburb

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    That’s the idea I’m thinking about. I do need the ability to use that type of design for the primary rocket as I need to sim the stability as designed or are fins (however large or small) needed to stabilize this. The actual rocket body exists and will be using 54mm motors (J, K).

    This is the finished body of the rocket:
    https://flic.kr/p/RUFUTR

     
  9. Apr 26, 2019 #9

    K'Tesh

    K'Tesh

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  10. Apr 26, 2019 #10

    dinoburb

    dinoburb

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    Must be a good day as I learned something! Thanks.
     

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