More Half-Baked Designs Thread

Discussion in 'Scratch Built' started by jqavins, Oct 1, 2019.

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  1. Oct 17, 2019 #31

    jqavins

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    Joseph Avins TRF Supporter

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    Yeah, it's rough, but I"ll just have to suck it up. ;)
     
  2. Oct 30, 2019 #32

    jqavins

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    Joseph Avins TRF Supporter

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    Here's a really silly one. Fins that are clipped washers, each decorated like a different kind of doughnut.
    upload_2019-10-30_17-16-4.png
     
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  3. Oct 30, 2019 #33

    mbeels

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    That would suit your profile picture very well.
     
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  4. Oct 30, 2019 #34

    prfesser

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    I dunno...that looks fully baked to me.;)
     
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  5. Oct 31, 2019 #35

    jqavins

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    Joseph Avins TRF Supporter

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    I hadn't even thought of that.

    Fried.
     
  6. Nov 26, 2019 #36

    jqavins

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    Joseph Avins TRF Supporter

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    My next project, after the Triple-V, will be a return to this. When I found the moving box with lots of my rocket stuff a week ago or so, I found the booster from this with a rebuild motor tube that I don't remember doing. I kept the sustainer for single stage use (not that I've ever actually flown it) and found that quite a while ago, so I could be ready for another ground test pretty quickly. Come to think of it, with the Triple-V going in slow motion, I might just get back to this before finishing that.
     
  7. Dec 4, 2019 #37

    jqavins

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    Joseph Avins TRF Supporter

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    "Wavy". Or maybe "Standing Wave".
    upload_2019-12-4_12-37-1.png
     
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  8. Dec 4, 2019 #38

    mbeels

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    The two-stage looks like a fun rocket, I watched your ground testing videos. It seems like you're just about there, very nearly done. I think that your rear-eject idea ought to work.

    I like the standing wave (or traveling wave), it reminds me of the rockets made from styrofoam cups back to back. Would that be a bunch of transitions?
     
  9. Dec 4, 2019 #39

    neil_w

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    I would propose the name: "How I became expert in making cardstock shrouds over the course of a single build". :)
     
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  10. Dec 4, 2019 #40

    kuririn

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    Or The Back Massager.
     
  11. Dec 5, 2019 #41

    Mugs914

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    I think it needs to be called "Mock Diamonds". Especially with that color paint job.
     
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  12. Dec 5, 2019 #42

    BABAR

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    You know, some of the single serve cereal cups are just about the right shape. Also some yogurt containers.
     
  13. Dec 6, 2019 #43

    Greg Furtman

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    Or maybe "Mach Diamonds" :D
     
  14. Dec 6, 2019 #44

    Mugs914

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    Yeah, that's what I was seeing! I just tried to get too cute with the spelling. :rolleyes:

    You could do the nose cone up to look like a liquid fuel engine bell, a little fancy painting on the "tube"...
     
  15. Dec 6, 2019 #45

    mbeels

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    I thought that the "Mock" was pretty clever, I like the play on words.
     
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  16. Feb 17, 2020 #46

    jqavins

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    Joseph Avins TRF Supporter

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    The Colorburst:
    Color Burst Fins 1.jpg Color Burst Fins 2.jpg Color Burst Fins 3.jpg Color Burst Aft.jpg

    And, Teardrops:
    TD_1.JPG TD_2.JPG
     
  17. Feb 17, 2020 #47

    neil_w

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    I wanna see the fin jig for Colorburst. :)
     
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  18. Feb 17, 2020 #48

    mbeels

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    Whew, building Colorburst would be an exercise in fin glueing patience. But it would be cool to see it built. It might be a neat effect if it rotated on the way up, especially with those fin shapes.
     
  19. Feb 17, 2020 #49

    Nytrunner

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    Very draggy. The airflow fin behavior would be....complicated
     
  20. Feb 18, 2020 #50

    neil_w

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    BTW since no one else has commented on it: I like Teardrops a lot. I kind of feel like I've seen something like it before, but I can't place where or when that might have been. It sort of makes me think of a rocket-ized Shuttlecock.

    But it looks like it would be really hard to get stable. Joe, are those renders from Rocksim or just a CAD program? Curious where the CP ends up.
     
  21. Feb 18, 2020 #51

    jqavins

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    Joseph Avins TRF Supporter

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    The fin shapes were the starting point. Their sequencing didn't show up well in the renders and I added the color sequence to enhance the shape sequence. And then I liked it. The jigging would be, well let's say interesting. With repeated applications of the Estes grey jig one get to 12 but not to 24. Or I could settle for just the 12. Carefully place one by hand in between two of the 12 then use the jig for the remaining ones. It should work.

    The egg lofter nose on that one is just a placeholder. I wanted something besides a plain nose cone and that's what I came up with in a hurry, but I want something more, um, elaborate? Complex? Worthy of the tail.

    I had the same impression when I saw it complete. I was inspired by the idea of having the same cone angle on the body and the fins; with the all tail cone body it shouldn't look like a shuttlecock, yet it does.

    Rocksim. For scale, the motor mount is 24 mm (or is it 18? I did this one a long time ago and just got around to posting it) and it's minimum diameter at the aft end. It takes 20 g of nose weight to get to 1.0 caliber. At that point, the CG and CP are practically half it's length apart because the maximum forward diameter is so big. I'm confident that'd be OK.
     
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  22. Feb 18, 2020 #52

    BABAR

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    Teardrop looks good and stabile (-izable, anyway). Not a lot of room for recovery device.

    Reminded me of the Birdie shuttlecock rocket too!
     
  23. Feb 18, 2020 #53

    jqavins

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    Joseph Avins TRF Supporter

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    I was thinking of one or more streamers, wound like a tape real, all together to make one disc that fits at the widest place.
     

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