The Javelin

Discussion in 'Scratch Built' started by ThreeJsDad, Feb 17, 2020.

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  1. Feb 17, 2020 #1

    ThreeJsDad

    ThreeJsDad

    ThreeJsDad

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    Yah I know the name is padestrisn but it will work a place holder. The MMT is a 24mm. I have not put the chute in it yet but right now she is 3.2oz. IMG_20200217_160039484.jpg
     
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  2. Feb 18, 2020 #2

    dhbarr

    dhbarr

    dhbarr

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    Four of Diamonds
    Razor Maid
    Girl From Ipanema
     
  3. Feb 18, 2020 #3

    BABAR

    BABAR

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    I think it looks sharp no matter what you call it!

    "Sometimes simple is better"
    a quotation from Les S. Moore.
     
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  4. Feb 18, 2020 #4

    ThreeJsDad

    ThreeJsDad

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    Four Diamonds !! Thanks
     
  5. Feb 18, 2020 #5

    ThreeJsDad

    ThreeJsDad

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    Thank You, I really like this one.

    I love the odd rocks and sci-fi stuff but there is something elegant about a rocket that is obviously purpose built.
     
  6. Feb 22, 2020 #6

    jqavins

    jqavins

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    "One More Javelin"?

    Javelin may not be original, but it fits the rocket's look very well.
     
  7. Feb 23, 2020 #7

    BABAR

    BABAR

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    Some other ideas

    Hanjari. (Swahili for Dagger)

    Sindano (Swahili for Needle)

    IcePik
     
  8. Feb 23, 2020 #8

    ThreeJsDad

    ThreeJsDad

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    Thank You, I really like the proportions and the angles.
     
  9. Feb 23, 2020 #9

    ThreeJsDad

    ThreeJsDad

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    I do like Sindano and I believe folks could actually pronounce that....

    I made a baby version for 18mm as well, it weighs 15grams.....
     
  10. Feb 23, 2020 #10

    mbeels

    mbeels

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    Nice names, I'm curious, do you happen to know Swahili?

    I like the rocket as well, I'm also partial to 4-finned rockets (although I know that there are some strong opinions here in favor of 3 fins!).
     
  11. Feb 23, 2020 #11

    ThreeJsDad

    ThreeJsDad

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    I know Babar speak Klingon so he probably speaks Swahili as well...

    I love the look of four fins and split fins but if I am designing for pure performance it would be three small fins.
     
  12. Feb 23, 2020 #12

    BABAR

    BABAR

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    LOL, I don’t know Swahili or Klingon. Just like people think romantic things sound better in French or Italian, seems like translating rocket names like sword or knife or needle or dagger into Swahili always sounded cool to me. With all due respect to @k’tesh, I ma not convinced Klingon is even real. I made up the name “T’Orq” for a model that looked like a cross between a Klingon Bird of Prey and a crescent wrench. Don’t get me wrong, it was a really COOL cross!
     
  13. Feb 23, 2020 #13

    BABAR

    BABAR

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    I am watching Star Trek TNG. A real Klingon ship name which would make an unfortunate name for a rocket.

    The P’Rang
     
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  14. Mar 5, 2020 #14

    ThreeJsDad

    ThreeJsDad

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    Update, I need to shoot a pic but all painted she weighs 162 grams !!!! I now have a 29mm version about done.
     
  15. Mar 5, 2020 #15

    mbeels

    mbeels

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    Nice, that is super light! Curious to see what it looks like painted.
     
  16. Mar 5, 2020 #16

    ThreeJsDad

    ThreeJsDad

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    I will shoot some pics tomorrow of all three. I have an 18mm version, a 24 and 29. Even the 29mm is pretty light. I am not doing the tail cone g

    I will shoot some pics tomorrow of all three. I have an 18mm version, a 24 and 29. Even the 29mm is pretty light. I am not doing the tail cone going forward. I am able to make the tubes really light because the MMT has two centering rings and there is another ring towards the nose that the shock cord anchors to. It has holes in it for deployment gases but it still stiffens the tube. The nose cone also helps with hoop stiffness so they will certainly handle the launch.

    The cool thing is the lighter it is built the lighter in can be built. I know that sounds obvious but as it gets lighter there is less stress on the air frame so we can go even lighter.... There are certain structural aspects and requirements than need to be met but I am not a fan of overbuilding.

    There are cases though where a lighter rocket does not fly as high because it slows down very quickly during the coasting phase of the flight.
     
  17. Mar 5, 2020 #17

    mbeels

    mbeels

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    Me as well. The lighter it is, the easier it is to recover (smaller parachute, less deployment stress, etc...), the faster it accelerates up to speed, and the better it flies on long burn motors. I'm a fan of strong enough and strength through design and materials, rather then massive epoxy fillets everywhere.
     
  18. Mar 5, 2020 #18

    ThreeJsDad

    ThreeJsDad

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    You are my Hero, you are also a rare breed. A good design with the correct materials for the application will win every time.

    As an example I did through the wall fins but the tabs are only about .25". When I cut the four slots the tube would be super flimsy to some people. However, after putting the MMT in and mounting the four fins that area is rock solid. I did through wall not just for durability but because I find them easier to attach.

    I definitely do not follow the Rube Goldberg school of design.
     
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  19. Mar 6, 2020 #19

    BABAR

    BABAR

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    Too heavy for an 18 mm with an adapter. Would this fly on a Fat 24 mm C? I’m thinking with a D it’s gonna scoot. How big is your field?
     
  20. Mar 6, 2020 #20

    ThreeJsDad

    ThreeJsDad

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    I think you are correct it will move on a D and I plan to fly it on an E !!!! With a streamer at apogee and DD at 300'. We have a pretty nice field and not that it matters with MPR's but we have a 4K waiver. I will do the maiden on an Estes D and then move to an Aerotech E. I really designed it for E's and F's.

    I just weighed the 29mm version.......435G !!!!!!!!!!! It is 60mm ID and just under 5' tall. I think I can make my tubes a little heavier. That does not include the chute or shock cord but I think that is pretty light.
     
  21. Mar 6, 2020 #21

    ThreeJsDad

    ThreeJsDad

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    I am not sure anyone would be interested but I could do a thread on my building methods. Not really a build log for any one rocket but how I roll my tubes, turn my nose cones and even laminate fins.
     
  22. Mar 6, 2020 #22

    BABAR

    BABAR

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    Looks like you have it well covered!
    Hoping for straight trails, soft landings, and short walks on all three!
     
  23. Mar 6, 2020 #23

    ThreeJsDad

    ThreeJsDad

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    Thanks my Friend, if the walk looks to be too long I hire a kid to go get it.....LOL

    I don't think I told you this but a line in your signature rings in my head frequently and helped me get through some tough times lately.
     

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