Dunkin Donuts launch lug

Discussion in 'Low Power Rocketry (LPR)' started by Joekeyo, Nov 20, 2019.

Help Support The Rocketry Forum by donating:

  1. Nov 20, 2019 #1

    Joekeyo

    Joekeyo

    Joekeyo

    Forum Supporter TRF Supporter

    Joined:
    Sep 12, 2019
    Messages:
    40
    Likes Received:
    7
    Gender:
    Male
    Location:
    Sun City Center, FL
    Being a COM (cheap old man), I am always looking for a way to save money. I discovered that a dunkin donuts straw fits over a 1/4" launch rod very nicely. I also discovered that Elmer's school glue does not stick to said straw. It does stick very well to body tubes, however. Does anyone have any tips on how to clean up the messy BT that's left behind when the glassine is removed?

    I am going to attach the LL ( 1" DD straw segment) using epoxy. I will also apply a thinned layer of epoxy to the straw to beef it up a bit. Then I will repair the damaged BT and paint.
     
  2. Nov 20, 2019 #2

    rharshberger

    rharshberger

    rharshberger

    Well-Known Member

    Joined:
    Oct 13, 2014
    Messages:
    8,473
    Likes Received:
    824
    Gender:
    Male
    Location:
    Pasco, WA
    Repairing a fuzzy BT is as easy as soaking with CA (water thin type) and then sanding smooth and repainting.
     
  3. Nov 20, 2019 #3

    prfesser

    prfesser

    prfesser

    Lifetime Supporter TRF Lifetime Supporter

    Joined:
    May 7, 2017
    Messages:
    752
    Likes Received:
    474
    Location:
    Murray, KY
    I don't know what DD straws are made of, but if they're either polyethylene or polypropylene, it ain't gonna stick. Polystyrene should be ok.

    I'd find a strip of gummed paper tape, wet it, and wrap around the straw, making sure that it overlaps itself. The gum (dextrin) will stick to itself and to the straw well enough.
     
  4. Nov 20, 2019 #4

    kuririn

    kuririn

    kuririn

    BARGeezer TRF Supporter

    Joined:
    Oct 3, 2016
    Messages:
    2,597
    Likes Received:
    663
    Gender:
    Male
    Location:
    Hawaii
    After all the time and effort to get a plastic straw to work as a launch lug, wouldn't it be cheaper to pay a few cents for a regular launch lug?
     
    John Taylor, neil_w and Joekeyo like this.
  5. Nov 20, 2019 #5

    linville86

    linville86

    linville86

    Member

    Joined:
    Jan 9, 2017
    Messages:
    17
    Likes Received:
    1
    You can wrap the straw with a paper tape like masking tape or possibly label paper. The tape will stick to the straw and the glue will stick to the tape.
     
  6. Nov 20, 2019 #6

    Nytrunner

    Nytrunner

    Nytrunner

    Master of Rivets

    Joined:
    Oct 15, 2016
    Messages:
    5,278
    Likes Received:
    1,156
    Gender:
    Male
    Location:
    Huntsville AL
    Would thick superglue adhere to the straw?
     
  7. Nov 20, 2019 #7

    Joekeyo

    Joekeyo

    Joekeyo

    Forum Supporter TRF Supporter

    Joined:
    Sep 12, 2019
    Messages:
    40
    Likes Received:
    7
    Gender:
    Male
    Location:
    Sun City Center, FL
    You are so right. This endeavor is definitely behind schedule and over budget. 1 step forward and 2 steps back. But it did lead to some interesting discussions and potential solutions.
     
  8. Nov 21, 2019 #8

    BABAR

    BABAR

    BABAR

    Builds Rockets for NASA TRF Lifetime Supporter TRF Supporter

    Joined:
    Aug 27, 2011
    Messages:
    4,464
    Likes Received:
    521
    You can get paper straws dirt cheap on Amazon (likely other sources as well) They glue on easily with white or wood glue, they are fairly strong, they cut easily, they work great with 1/8 and 3/16 rods. One box will basically last you a lifetime. They actually are a little oversized for both 1/8 and 3/16, so not good if you are looking for high performance, but great for sport/just for fun rockets.
     
  9. Nov 21, 2019 #9

    Tom

    Tom

    Tom

    Forum Supporter TRF Supporter

    Joined:
    Jun 4, 2019
    Messages:
    253
    Likes Received:
    42
    No adhesive known to man will bond to the plastic straws. Maybe if you wrapped it in duct tape or something.
     
  10. Nov 21, 2019 #10

    scadaman29325

    scadaman29325

    scadaman29325

    Catching up and tripping all over myself.

    Joined:
    Feb 6, 2004
    Messages:
    269
    Likes Received:
    28
    Gender:
    Male
    Location:
    Clinton, SC
    Yes, I put a drop on a qtip and swabbed it on, then sanded. Came out pretty good on the next primer coat too.
     

Share This Page