DiaLFonZo - Baby Dart - Build

Discussion in 'Low Power Rocketry (LPR)' started by Eric Nantel - DiaLFonZo, Dec 21, 2019.

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  1. Dec 21, 2019 #1

    Eric Nantel - DiaLFonZo

    Eric Nantel - DiaLFonZo

    Eric Nantel - DiaLFonZo

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    Hi All,

    I've build a bigger and not so great rocket this year. (DiaLFonZo - BeG or Staples Rocket - Build) Mostly to play around available materials during a weekend which ended up using a shipping tube (heavy) and 3D printed parts. Rocket became a land dart (as expected after sim) but the overall look interest me so i made that little one last week.

    Originally named "Dart" but got a message from @cwbullet for the files and he refer to it as "Baby Dart" and i liked it so ... Baby Dart it is.

    Today i'm printing a revised version with slight tolerance changes in the design than i will be uploading the STL's here and on Thingiverse. If anybody need the STEP let me know.

    DiaLFonZo - Mini Dart.png

    Specs
    • 400mm length (but can be adjusted with the addition of more body tubes)
    • 18mm friction fit motor mount
    • Integrated rod sliders
    • 3 fin design (could be changed easily if one need it)
    Print
    • Up Mini V1
    • Print in the image orientation, no support material
    • Higher resolution the better but i've made mine 0.25mm for speed (~3h)
    DiaLFonZo - Baby Dart - Printing.png
     

    Attached Files:

    Last edited: Dec 21, 2019
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  2. Dec 21, 2019 #2

    Eric Nantel - DiaLFonZo

    Eric Nantel - DiaLFonZo

    Eric Nantel - DiaLFonZo

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    Not so great print this morning.
    I had changed the wall thickness from 1mm to 0.75mm and it printed awful.. :(

    More corrections and another print.. ;)
     
  3. Dec 22, 2019 #3

    Eric Nantel - DiaLFonZo

    Eric Nantel - DiaLFonZo

    Eric Nantel - DiaLFonZo

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    I've made some tolerance adjustments as well as an added internal part to hold the shock cord as well as single part nosecone.

    For some reasons this forum do not allows for multiple modifications of a post so i cannot update the first post anymore, this is very very annoying...

    I did an OpenRocket sim and the build would be a lot more happy with 3 section in the middle rather than 2.

    https://www.thingiverse.com/thing:4060027

    DiaLFonZo - Mini Dart.png
     

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    Last edited: Dec 22, 2019
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  4. Dec 22, 2019 #4

    Joshua Westbrook

    Joshua Westbrook

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    Very nicely done! Are you going to add motor retention on a later model? Or do you want to keep it specifically friction fit?
     
  5. Dec 22, 2019 #5

    Eric Nantel - DiaLFonZo

    Eric Nantel - DiaLFonZo

    Eric Nantel - DiaLFonZo

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    Thanks - Do you have an idea for a retainer ? Main issues is the lack of space since the walls are only 1mm thick.
     
  6. Dec 22, 2019 #6

    Joshua Westbrook

    Joshua Westbrook

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    would you be opposed to making the tube diameter a hair wider to accommodate an older style of twist lock retention that some of the older estes models have? let me dig through my stuff and ill snap some pics for you.
     
  7. Dec 22, 2019 #7

    Eric Nantel - DiaLFonZo

    Eric Nantel - DiaLFonZo

    Eric Nantel - DiaLFonZo

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    It can be looked for sure - I can add something at the end similar to what i did here:

    [​IMG]
     
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  8. Dec 22, 2019 #8

    Joshua Westbrook

    Joshua Westbrook

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    Here are those pics, they are from the estes amazon.

    I like what you have there too, does it throw your weight off too much?
     

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  9. Dec 22, 2019 #9

    Eric Nantel - DiaLFonZo

    Eric Nantel - DiaLFonZo

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    I do have one with that system here (Amazon) and it work fine.
    However it will require quite a larger body than what's currently used. Let me have a look.
     
  10. Dec 22, 2019 #10

    Eric Nantel - DiaLFonZo

    Eric Nantel - DiaLFonZo

    Eric Nantel - DiaLFonZo

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    I can change it for you if you're interested in printing a bigger version
     
  11. Dec 22, 2019 #11

    Joshua Westbrook

    Joshua Westbrook

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    I don't have a printer, i was just curious as to your thoughts on it if you were gonna experiment in the future. i really like your design and i am hoping to see a successful flight for you.
     
  12. Dec 22, 2019 #12

    Eric Nantel - DiaLFonZo

    Eric Nantel - DiaLFonZo

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    The biggest issue is the size and thickness of the tube. I have an idea but don't know if it will be possible. I'll update once I have try.

    Here is the bottom with a B6-4l IMG_20191222_123545.jpg IMG_20191222_123536.jpg
     
  13. Dec 22, 2019 #13

    Joshua Westbrook

    Joshua Westbrook

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    ok, it looks great, im sure there will be others that are far more knowledgeable that will give some input. I have yet to really tinker with open rocket or rocksim yet, To darn many house projects going on for me to do and theorycrafting of my own. ive been building kits just to get that craving out. lol.
     
  14. Dec 22, 2019 #14

    Eric Nantel - DiaLFonZo

    Eric Nantel - DiaLFonZo

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    Every idea is a good one, I'm happy you raised it.
    Just hard to implement but I'll try something.
     
  15. Dec 23, 2019 #15

    Eric Nantel - DiaLFonZo

    Eric Nantel - DiaLFonZo

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    First coat and light sand
     

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    Last edited: Dec 23, 2019
  16. Dec 23, 2019 #16

    Joshua Westbrook

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  17. Dec 23, 2019 #17

    Eric Nantel - DiaLFonZo

    Eric Nantel - DiaLFonZo

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    Tried.. Very flimsy design
     

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  18. Dec 23, 2019 #18

    Joshua Westbrook

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    How well does it hold together? A downward force may make it twist apart. I could be wrong though.
     
  19. Dec 23, 2019 #19

    Eric Nantel - DiaLFonZo

    Eric Nantel - DiaLFonZo

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    That was a print test to see rigidity and accuracy of the print.
    Initially wanted a clip effect at the end but I don't think it worth pursuing.

    I'll leave it friction for this build
     
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  20. Dec 23, 2019 #20

    Joshua Westbrook

    Joshua Westbrook

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    Ok, I see what you mean. Still great thoughts though! Any idea when it will have its first flight?
     
  21. Dec 23, 2019 #21

    Eric Nantel - DiaLFonZo

    Eric Nantel - DiaLFonZo

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    Don't know since it's winter here, I'll get it painted soon however.
     
  22. Dec 24, 2019 #22

    Eric Nantel - DiaLFonZo

    Eric Nantel - DiaLFonZo

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    Second coat of primer, i'm not happy yet of the finish.
    Clearly some 3D print marks are still visible.
     

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  23. Dec 24, 2019 #23

    Eric Nantel - DiaLFonZo

    Eric Nantel - DiaLFonZo

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    Playing around ...
     

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  24. Dec 24, 2019 #24

    Eric Nantel - DiaLFonZo

    Eric Nantel - DiaLFonZo

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    And one for my son...
     

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  25. Dec 24, 2019 #25

    Eric Nantel - DiaLFonZo

    Eric Nantel - DiaLFonZo

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    Missing one tube length but you get the idea.. What's nice is you can get any fins you like.
     

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  26. Dec 24, 2019 #26

    Joshua Westbrook

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    Those are great man, this has been my morning.
     

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  27. Dec 24, 2019 #27

    Eric Nantel - DiaLFonZo

    Eric Nantel - DiaLFonZo

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    Little rocket / missiles are so cute
     
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  28. Dec 24, 2019 #28

    Joshua Westbrook

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    With the exception of detail work, the rough draft is complete. Still need to add shockcord mount and filets but its flyable now.
     

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  29. Dec 25, 2019 #29

    djmartins

    djmartins

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    Very nice work!
    Don't stop doing what you're doing.
     
  30. Dec 29, 2019 #30

    Nate G

    Nate G

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    Options:
    1. add 1/4 inch or so of base tube extending below fin terminus to allow a tape retention a la competition standard practice.
    2. make a small hole in the tube along a fin for an Estes standard retention clip and use 5 min epoxy and a strip of thin fiberglass cloth to hold in place.

    something to consider.
     

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