Safely removing powder from CTI?

Discussion in 'Propulsion' started by Andrew_ASC, Sep 13, 2018.

  1. Sep 13, 2018 #1

    Andrew_ASC

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    If somebody has a min diameter rocket for example and wants to use a CTI motor without an motor ejection charge for electronic deployment charge only for cases where Apogee happens way after the maximum delay length and a motor eject backup is impractical. What steps to remove the stock ejection charge from a CTI product? What steps to put dog barf where? Pictures please. With AT motors we simply don’t include the powder and I am familiar with that process for AT not for CTI. Thanks.
     
  2. Sep 13, 2018 #2

    timbucktoo

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    Get a sharp Xacto knife and cut away the white paper. Do this over some newspaper. The BP can then be easily poured out. You might have to poke at it a bit, sometimes its clumped together but use a tooth pick or something non metallic. Make sure you get it all out of the touche hole too. Then stuff it with dog barf & cover with masking tape. I have also seen people just fill it with 5 minute epoxy.
    This is from a 38mm motor with BP removed. image1.jpeg
     
    Last edited: Sep 13, 2018
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  3. Sep 13, 2018 #3

    jimzcatz

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    What Tim said. Pics are not really necessary, it's just a paper cap. I use a small screwdriver.
     
  4. Sep 14, 2018 #4

    OverTheTop

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    I try to not use metal tools around BP. Chance of sparks if I slip and hit something else. I use a sharp wooden skewer to puncture into the paper cap and flip the cap off. Then the BP can be poured out.
     
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  5. Sep 14, 2018 #5

    jimzcatz

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    There is nothing in the BP well to create a spark. Nothing against caution, just saying.
     
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  6. Sep 14, 2018 #6

    OverTheTop

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    I understand, but if I slip with the scalpel and hit a nearby tool, or drop in on the metal bench? I'd rather not have any unnecessary frights thanks! They use wooden tools around fireworks for a good reason I think.
     
  7. Sep 14, 2018 #7

    dhbarr

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    Nylon spudger seems like something good to add to my range box anyhoo.
     
  8. Sep 14, 2018 #8

    Andrew_ASC

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    Thanks.
     
  9. Sep 14, 2018 #9

    grouch

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    I've always used a lit cigarette. Have I been doing it wrong?
     
  10. Sep 14, 2018 #10

    Kallahan11

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    Yes, a cigarette is bad for your health and probably doesn't have the thermal capacity to burn all of the paper. Try using an Oxy-acetylene torch, it's finicky work so forgo a face shield so you can see it better.
     
  11. Sep 14, 2018 #11

    Nytrunner

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    The couple times I've done it, I put some masking/electrical tape over the tip of a small flat head.
     
  12. Sep 14, 2018 #12

    dshmel

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    Thermite works well too.
     
  13. Sep 15, 2018 #13

    OverTheTop

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    I always wondered what "head end ignition" was :eek:
     
  14. Sep 15, 2018 #14

    snrkl

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    IMG_9992.jpg
     
  15. Sep 15, 2018 #15

    OverTheTop

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    Set fire to your hair
    Poke a stick at a grizzly bear
    Eat medicine that's out of date
    Use your private parts as piranha bait.

    Dumb ways to die
    So many dumb ways to die...


    Love that song :).


    BTW I wrote those words from memory.
     
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  16. Sep 15, 2018 #16

    snrkl

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    Invite a psycho-killer inside

    Scratch a drug dealer's brand new ride

    Take your helmet off in outer space

    Use a clothes dryer as a hiding place
     
  17. Sep 15, 2018 #17

    Andrew_ASC

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  18. Sep 15, 2018 #18

    Steve Shannon

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    I jab the two jaws of a needle nose pliers through the paper cap covering the ejection charge and then peel it off. Then I add the powder to my medicine bottle full of BP. I wear safety glasses while doing anything with BP. I put a little grease into the well.
     

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