Scissor wing transport inspired B/G (pic heavy)

Discussion in 'Rocket Boosted Gliders' started by Amsterdam, Jun 12, 2018.

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  1. Jun 12, 2018 #1

    Amsterdam

    Amsterdam

    Amsterdam

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    Kinda just had an idea and went for it. It glides alright without trim I’m hesitant to adjust the elevator. Isn’t there a rule on elevator angle? No more than 10 degrees?

    It has a 24” span, dihedirial is 16 degrees, glider weighs 16 grams. The wings removable, and it flies on mini engines. Probably just the a10

    anyways here’s some nudes, will probably only had a stripe or two and paint the booster.

    A8C77866-6C90-48C5-9948-8BF479CCEA5A.jpg 8948764B-4A01-46B1-B1C3-68CCED0AD8E8.jpg B84367AC-A7F6-4642-8ADD-5707FFBD4536.jpg 99D0217A-AA69-48E6-9822-B3C44A526DD5.jpg C333364A-58E9-48E4-8616-FED1ABB8B5C5.jpg CC2E8C9E-07C2-4D4B-A0F7-E3DB729054BC.jpg F7C7B127-2B98-418A-B2F7-788160DEF2E0.jpg 8C90F73A-6EFB-4666-84CC-7E0050BBDAED.gif 1F07D2E2-ADFF-4F4D-BD9C-B5B3D43CE9E7.jpg 54528939-91AE-457A-8564-4C5580D7D922.jpg
     
  2. Jun 12, 2018 #2

    Crawf56

    Crawf56

    Crawf56

    Pig Soooiiieee!!

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    Bravo! Well done! :wink:
     
  3. Jun 12, 2018 #3

    burkefj

    burkefj

    burkefj

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    Nice, a swing flop..
     
  4. Jun 12, 2018 #4

    Maxout

    Maxout

    Maxout

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    That looks awesome! Let's see it fly! :)
     
  5. Jun 13, 2018 #5

    Amsterdam

    Amsterdam

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    Thanks guys!
    Should get flown this week along with all my other gliders if i get a calm day
    Itll be a cell phone video but my partner will do her best to capture it.
     
  6. Jun 25, 2018 #6

    Rktman

    Rktman

    Rktman

    Eric Noguchi

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    Very cool! Clever wing locking and deployment system that looks very reliable.
     
  7. Jul 4, 2018 #7

    Amsterdam

    Amsterdam

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    Thanks! Nothings simplier than a toothpick haha, unfortunately I’m having flop deploy issues, the hooks are either too close or my rubbers too weak.
     
  8. Jul 4, 2018 #8

    Rktman

    Rktman

    Rktman

    Eric Noguchi

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    They look like they work fine in your video?
     
  9. Jul 4, 2018 #9

    Amsterdam

    Amsterdam

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    They open fine when the gliders not falling, but for one reason or another as the glider falls, the resistance from the air holds one, or both closed for far too long.
     
  10. Jul 4, 2018 #10

    Rktman

    Rktman

    Rktman

    Eric Noguchi

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    Guess the easiest 1st step is to test a shorter/stronger piece of elastic. How about a motor with a shorter or longer delay so that your glider is moving slower when the ejection charge deploys your wings?
     
  11. Jul 5, 2018 #11

    BABAR

    BABAR

    BABAR

    Builds Rockets for NASA TRF Supporter TRF Lifetime Supporter

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    VERY nice. Your flop wings may solve my problem with obtaining dihedral on a biplane rocket glider.......
    Thanks!
     
  12. Jul 7, 2018 #12

    Amsterdam

    Amsterdam

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    Switched to a very short piece of sewing elastic. Just knotted each end to give the hooks something to hold. Has a much stronger response, idk how well these hinges will hold up but it was boiler plate anyways.
     
  13. Jul 7, 2018 #13

    Amsterdam

    Amsterdam

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    The folded end, atleast on this my first attempt at it, is very draggy. The model itself has to be on the razors edge of stability because of that chunky wing and rear engine.
     
  14. Jul 7, 2018 #14

    Rktman

    Rktman

    Rktman

    Eric Noguchi

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    Hope that solves the problem and you have a successful flight.
     
  15. Jul 10, 2018 #15

    Amsterdam

    Amsterdam

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    Thank you!

    Should I build more flop wings what is the recommend material for live hinges?

    I’ve found examples of them done in multiple ways, I’m not a big fan of the nylon mesh/CA hinge,And pinned hinges never lay flat. So I’ve resorted to using self stick labels reinforced with CA, which are prone to tearing.

    Open to all kind of opinions
     
  16. Jul 10, 2018 #16

    burkefj

    burkefj

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    Joshua Finn could give a good answer, I would think live hinges, of mylar, tape, blenderm, monokote would be good but I have not built anything other than hinged surfaces which are similar but not exactly what you are doing.
     
    Last edited: Jul 10, 2018
  17. Jul 10, 2018 #17

    Rktman

    Rktman

    Rktman

    Eric Noguchi

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    Agree with burjefj, I've seen all those materials used successfully . Bought some blenderm and self-adhesive mylar tape to use with the flop wing glider I'm building, may go with the mylar since it's really light and tough. I've even resorted to using duct tape on a big glider where I wasn't all that concerned with weight, since it's a really tough fabric mesh and polyethelyne tape. In your case mylar would be my first choice because of it's low weight and strength.
     
  18. Jul 10, 2018 #18

    Maxout

    Maxout

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    I see I've been called out :D

    I've got a couple of go-to materials for flop wing hinges:
    1. Polyspan; this is what is included in my kits. You can attach it using a variety of ahesives. It's basically a plastic tissue paper. Moderately tough and seems to last a long time. Available from faimodelsupply.com; get the medium weight stuff.
    2. Coverite; this is a super tough mylar/fiber material that is semiporous so you can get a strong bond. I've had some minor issues getting a good bond with my preferred ahesives, but you can attach it with CA for an extremely strong bond. My earliest flopwings used this material and it has *never* failed. I don't know how much longer it will be available following the demise of Hobbico.
    3. Kevlar; yes, that stuff. Attach with epoxy. It'll basically never fail, but it's a pain in the neck to work with. Once in place though, it's the best hinge material on earth and you can vacuum bag it down for a perfect finish. I recommend sub-2 oz Kevlar for this task. Don't get Kevlar tissue since it's not nearly as strong and a little weird to work with. And yes, I have used this on hinges for folding wings. It's on a separate plane of existence. If your task doesn't need it, use an alternative. On the other hand, if you use it, it will not fail you.
    4. Monocote; Works well enough, but I usually end up going back and sealing the hinge points with CA to eliminate peeling. This is mainly my lack of skill with iron-on self adhesive coverings.

    -Josh
     
  19. Jul 11, 2018 #19

    Amsterdam

    Amsterdam

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    Thanks for all the information guys!


    Maxout, haha I’m the guy who suggested quetzalcoatlus, quetzal, for the windlance contest. I’m excited to try the mini version. it’s not really the place to say this but it is my thread lol... loving all that you and the rest of the Finns are doing over at J&H. Keep it up!
     
  20. Jul 11, 2018 #20

    Maxout

    Maxout

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    Glad to help. Well, the other guys are the ones who did the helping, but I'll claim some credit because I can.

    We definitely enjoy the craziness we do. I think Caleb has the most fun. :D
     

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