SpaceX Starship?

Discussion in 'Scale' started by RKeller, Mar 14, 2019.

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  1. Mar 14, 2019 #1

    RKeller

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    Anyone have a good openrocket file for a SpaceX Starship? what ratio nose do you think that is? Know of any nosecones that looks similar somewhere bt80 and up?
    [​IMG]
     
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  2. Apr 17, 2019 #2

    Ryan Miller

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    You could get a largebalsa nosecone and sand it down to the shape you want.

    Or maybe wait for another redesign? Lol
     
  3. Apr 17, 2019 #3

    Ben Martin

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    I'm probably going to 3D model and print one so I'll let you know the ratio.
     
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  4. Apr 17, 2019 #4

    RKeller

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    Cool! Wanna share your model when you're done?
     
  5. Apr 17, 2019 #5

    Ben Martin

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    It will be on Thingiverse
     
  6. Apr 17, 2019 #6

    rharshberger

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    Its smaller than a BT80, but BMS's BNC-70AJ is the right shape at about 2.5:1 ratio.
     
  7. Apr 17, 2019 #7

    cwbullet

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  8. Apr 18, 2019 #8

    Crawf56

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  9. Apr 18, 2019 #9

    Ben Martin

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    upload_2019-4-18_1-2-36.png

    3D modeled the nosecone according to the official photo released by SpaceX. The ratio is around 2:1 (1.85 to be exact).
    upload_2019-4-18_1-7-2.png
    upload_2019-4-18_1-7-43.png
    upload_2019-4-18_1-8-20.png

    I plan on designing a 3in (possibly high power) Starship. I'll post the progress here if that's alright.
     

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  10. Apr 18, 2019 #10

    RKeller

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    Looks great! I was measuring the image on my computer screen and it looked around 2:1. Very nice work on the model!
     
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  11. Apr 18, 2019 #11

    RKeller

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    And of course you can post here if you want!
     
  12. Apr 18, 2019 #12

    cwbullet

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    That is awesome. I can’t wait to see it printed,.
     
  13. Apr 19, 2019 #13

    Ben Martin

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    Completed the Starship model.

    upload_2019-4-18_20-41-27.png

    upload_2019-4-18_20-42-6.png

    upload_2019-4-18_20-42-52.png

    upload_2019-4-18_20-43-34.png

    upload_2019-4-18_20-44-6.png

    The model will be posted on Thingiverse once I verify that it will 3D print correctly. I'm happy with how it turned out.
     

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  14. Apr 20, 2019 #14

    RKeller

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    Very nice! Can't wait to see it printed!
     
  15. Apr 20, 2019 #15

    cwbullet

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    Me likey.
     
  16. Apr 20, 2019 #16

    Ben Martin

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    Any diameter in specific that you guys want it to be? Thinking about making the fins into a printable fincan to make things simple.
     
  17. Apr 20, 2019 #17

    Toothless

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    Would love to have one in a diameter that I could run LP in and one for MP power too … I'm not in to HP yet !!!
     
  18. Apr 20, 2019 #18

    Ben Martin

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    Uploaded 3in and 4in fincans to Thingiverse. I will work on the smaller diameters right now. Fincans will be later as I have to get them correctly scaled.

    Link: https://www.thingiverse.com/thing:3577543
     
  19. Apr 20, 2019 #19

    Ben Martin

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    Any specific diameters in mind?
     
  20. Apr 20, 2019 #20

    Toothless

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    I have no idea, I've never printed a Rocket before so I have no clue as to what it would weigh
     
  21. Apr 20, 2019 #21

    Ben Martin

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    Would likely just recommend printing a fincan for the smaller diameters. It makes it simpler.
     
  22. Apr 25, 2019 #22

    gwh

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    This isn't Starship but rather Starhopper, the slightly shorter and fixed fin prototype of Starship (that is before the nose cone blew over and they decided to just leave it as a trash can with fins).

    Printed in 3 segments of ABS, the layer adhesion on the white filament was garbage so I coated it in epoxy.
    That shiny tube beside it is actually vinyl stickers that will be cut to cover up the whole thing.

    The plan is to build it in a really unconventional skin and stringer style with laser cut plywood and bulk heads so I can actually strip it down. It's pretty thin wall so a little added strength will be nice. It will also need a LOT of nose weight, a taller version would be much easier. Mind you that's planning for 3xD12's so there's a lot of weight to deal with.
    I do have long term ambitions of putting a BPS.space TVC kit but who knows when that might ever happen.


    Its 1:88 scale to match the official Falcon 9 model as well as my long, long delayed Falcon Heavy.
     
  23. Jun 13, 2019 #23

    gwh

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    I got all the insides built up and all the vinyl decals applied.

    Apologies for the low res photos, I had to use my webcam instead of my phone due to some camera problems...


    WIN_20190612_16_46_47_Pro.jpg WIN_20190612_16_51_05_Pro (2).jpg WIN_20190612_16_43_41_Pro (2).jpg
     

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  24. Jun 13, 2019 #24

    neil_w

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    Nice!!!
     
  25. Jun 14, 2019 #25

    aerostadt

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    Beautiful silver finish! How did you do it?
     
  26. Jun 15, 2019 #26

    gwh

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    CNC cut vinyl stickers. One could do it with chrome tape from an automotive store too. The nose cone was printed as as staigt conical segments instead of a contstant curve to make it eadier.
     
  27. Sep 2, 2019 #27

    gwh

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    The other Starhopper thread had me wondering about this and base drag:
    https://www.rocketryforum.com/threa...tarhopper-aka-deskhopper-scratchbuild.154605/

    Here is the open rocket file for this, I'm hoping to learn more on base drag and if I can reduce the nose cone weight. Also looking to obtain a reasonable estimate on altitude of this.

    I've created one with the base drag "cheat", and one without. The difference in nose weight is about 200 grams, quite substantial.
    https://www.apogeerockets.com/education/downloads/Newsletter162.pdf
     

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  28. Sep 3, 2019 #28

    neil_w

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    First of all, you didn't override the weight of the base drag tail transition to 0, so the situation is even a bit better, and you can reduce the nose weight a touch more.

    I tried deleting the tail transition and overriding the CG forward, to just get it stable for simulation, and got a bit over 1900ft:
    upload_2019-9-2_21-48-32.png

    With the nose weight reduced a bit more, that number will change a bit again.

    As I've mentioned in the past, I *think* that for the flight simulation, you omit the base drag correction; otherwise it adds still more drag that doesn't exist in the model. If someone can confirm that is correct it would be great.

    Also, if you go with about 1/10 the length of the rocket as stability margin target, you can reduce the nose weight even more.

    Regrettably I am not certain about how much of this is "correct."
     
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