ARCASes for me

Discussion in 'Scale' started by HVArcas, Feb 18, 2020.

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  1. Feb 18, 2020 #1

    HVArcas

    HVArcas

    HVArcas

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    I like ARCAS rockets (go figure)

    About to build one "standard" and one HV model, from fiberglass/wood/cardboard scraps I have around. I cannot find good scale data for either :( I am also not that concerned about the finer details, but would like to get the length/diameter ratio correct and fin shape correct, as well as an authentic looking paint job.

    Wikipedia has L/D for one of them but does not indicate if that is tubing length, or full length including the nose. I assume the latter but anyone know? Know if the HV is the same ratio?

    Do HV and "standard" have the same fin shapes?
     
  2. Feb 18, 2020 #2

    Ez2cDave

    Ez2cDave

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    No, they do not.

    Dave F.
     
  3. Feb 18, 2020 #3

    HVArcas

    HVArcas

    HVArcas

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    Oh that is fantastic, thanks a ton!

    I suppose that ties in to my other question, what the heck does "HV" truly mean historically. Most places that use that moniker seem to be referencing the Aerotech or MaDCow kit, heck I half thought it was to avoid trademark on the Super Arcas or Robin?
     
  4. Feb 18, 2020 #4

    Ez2cDave

    Ez2cDave

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    I have seen "HV" refer to "high-velocity".
     
  5. Feb 18, 2020 #5

    GalantVR41062

    GalantVR41062

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  6. Feb 18, 2020 #6

    HVArcas

    HVArcas

    HVArcas

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    Sorry, that part I knew, what I was trying to say was I never see specs or comparisons between HV vs standard, only standard vs robin/super, and I was speculating that modelers made up HV to avoid copyright or something.But maybe HV was a real thing from Atlantic Research Corp, I have no idea.
     
  7. Feb 18, 2020 #7

    mikec

    mikec

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    It certainly was, but I believe only as the second stage of various two-stage "Boosted Arcas" configurations. See https://en.wikipedia.org/wiki/Boosted_Arcas and the links from there.
     
  8. Feb 18, 2020 #8

    Ez2cDave

    Ez2cDave

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    The Boosted ARCAS ( several versions ) and the Sparrow-ARCAS . . .

    Dave F.

    arcbooostedarcas1.jpg


    arcboostedarcas2.jpg


    VARIOUS VERSIONS.jpg


    arcsparrowhvarcas2.jpg


    arcsparrowhvarcas1.jpg


    arcsparrowhvarcas.jpg
     

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  9. Feb 19, 2020 #9

    dmo

    dmo

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    Scale data for the ARCAS is redibly available and has been since at least 1969.
    http://www.ninfinger.org/rockets/ModelRocketry/Model_Rocketry_v01n06_04-69.pdf

    It is a very simple rocket and so there are not a lot of "details" unless you want to get into modeling the various payload options and nose cones.

    Data for the boosted and HV versions is harder to find but enough for a decent model is available.

    Visually the only difference between a stanadard ARCAS and the HV version is the fins. The ARCAS has a visable tailcone and fins that wrap around it. The HV has a fin can that hides the tail cone and the fins are larger. The span is the same, but the root edge for the HV is 9.85" vs 6.8 for the standard.
     

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  10. Feb 19, 2020 #10

    SCooke123

    SCooke123

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    A lot of good info - thanks all!!
     
  11. Feb 19, 2020 #11

    Ez2cDave

    Ez2cDave

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    Last edited: Feb 19, 2020
  12. Feb 21, 2020 #12

    HVArcas

    HVArcas

    HVArcas

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    Only when you are looking in the right place!

    Super glad I asked, this turned in to quite an excellent repository of ARCAS info.
     
  13. Feb 21, 2020 #13

    Ez2cDave

    Ez2cDave

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    Depending on the prototype, the "ARCAS Bear" logo is also needed data.

    Dave F.

    7932273020_aa1a359b1d_o.jpg



    48294457496_472c7058ed_k.jpg
     

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