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  1. #1
    Join Date
    16th January 2015
    Location
    Perry, UT
    Posts
    33

    Best way to get rocketpoxy where I want it

    Working on 4 inch diameter rocket with 76mm motor tube, which leaves a half inch gap, would like to reinforce the fins and centering ring which is about 9 or 10 inches deep from the end of the rocket.

    Hope that makes sense?

    Am I a Good Man?
    --Doctor Who

    NAR: 211218 TRA: 15593
    L1: Madcow Twitch DD - CTI I297SK 4328'

  2. #2
    Join Date
    21st September 2017
    Location
    NY/NJ
    Posts
    218
    Consider injecting internal fillets.
    More here:
    http://www.rocketryforum.com/showthr...ternal-fillets

    a

    __
    Radrocketeers.org NAR L2

  3. #3
    Join Date
    24th August 2013
    Posts
    555
    Click image for larger version. 

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    I change the size of the syringe and tubing depending on volume of adhesive required.

  4. #4
    Join Date
    6th June 2011
    Location
    San Diego. CA.
    Posts
    6,434
    Don't laff-get a handful of the 'dollar store' turkey flavour injectors. You can inject epoxy thru holes drilled along the fin root and CR (front end) For a real adventure, (practice this first-everything happens really fast) set up two part foam loads ( I used 3 basters for this) by measuring the base in three separate cups (be mindful of the capacity of the baster) and three cups of catalyst. I used straws but you can use clear tubing (like aquarium air tubing) glued/taped to needle outlet to make three injector 'kits'. position these at the end of the rocket in each 'fin pocket' with the rocket standing 'upside down. It helps to have an extra pair of hands for this. Put the base in the injector and then add catalyst and stir with a chop stick and QUICKLY insert the plunger. Do this quickly for all three bays. The expanding foam will fill the cavity and you can trim out for your final CR install. Crush it down for your epoxy bond on the forward (inside) edge. Note you cannot have the motor retainer on the motor tube at this time. As usual, mask and keep all areas from the dreaded 'foam overload' as it expands up (but hopefully not over the end of the tube). I think I used acetone to remove the sticky overflow before it cured. Yes, this is a pain in the ass to do, but is a really strong fin can. Make sure to do your Cp/CG calcs afterwards. Be sure to use newspaper to protect any carpet or surface you are working on. Don't ask for details about THAT! Straight smoke and good chutes!
    TRA 2383
    Somebody told me I was on the watch list-I hope I get a Rolex.....
    The road to Hell is paved....you're welcome.
    I can't remember the last rocket I built, because I haven't built it yet.....

  5. #5
    Join Date
    6th June 2011
    Location
    San Diego. CA.
    Posts
    6,434
    Quote Originally Posted by afadeev View Post
    Consider injecting internal fillets.
    More here:
    http://www.rocketryforum.com/showthr...ternal-fillets

    a
    Apparently i type really slow so if my post is overkill, I apologize!

    TRA 2383
    Somebody told me I was on the watch list-I hope I get a Rolex.....
    The road to Hell is paved....you're welcome.
    I can't remember the last rocket I built, because I haven't built it yet.....

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