Curious thing in Open Rocket

Discussion in 'Rocketry Electronics and Software' started by Tom, Jun 23, 2019.

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  1. Jun 23, 2019 #1

    Tom

    Tom

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    I found a .roc file for the estes Loadstar and it seems to have pretty good fidelity.

    But I tried something and was a little surprised by the results. Basically the rocket is a two stage rocket. The default design is with the fins lined up with one another. I ran the sim in that configuration.

    Just for fun I then rotated the fins on the booster section 45 degrees so the fins would be in between one another. I figured that would up the drag factor. Ran the simulation with the same engines and the results were identical to the default configuration!?
     
  2. Jun 24, 2019 #2

    dhbarr

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    I suspect the entire flight regime was substantially subsonic, and the fins aren't close enough together to interfere with each other dragwise.
     
  3. Jun 24, 2019 #3

    K'Tesh

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    Have you seen my .ork file?

    [​IMG]

    https://www.rocketryforum.com/threads/kteshs-openrocket-files.123564/page-2#post-1443676
     
    Last edited: Jun 24, 2019
  4. Jun 24, 2019 #4

    neil_w

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    I doubt if OR takes into account alignment of fins like that. I tend to think that fully modeling the effects of that sort of thing are beyond the scope of the program. I can try to find out if you like...
     
    Maxwelljets likes this.
  5. Jun 24, 2019 #5

    Tom

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    Thanks Ktesh that is actually the .roc file I am using. Like I said seems pretty high fidelity.

    Thanks Neil but that's pretty much what I figured. No need it was just something I noticed.
     
  6. Jun 24, 2019 #6

    K'Tesh

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    When you said .roc, you had me fooled... OpenRocket saves as .ork files (OR can open .rkt files too). Glad you like it!
     

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