Wanted Head-End Ignition Closures

Discussion in 'Yard Sale / Wanted' started by Viperfixr, Nov 30, 2018.

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  1. Nov 30, 2018 #1

    Viperfixr

    Viperfixr

    Viperfixr

    Born Again Rocketeer TRF Supporter

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    I am interested in any head end ignition closures, for either CTI or Aerotech motors, in any size 29-75mm--whatever you have for sale. Please just PM me with what you have. Thanks!
     
  2. Dec 2, 2018 #2

    Viperfixr

    Viperfixr

    Viperfixr

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  3. Dec 4, 2018 #3

    Cl(VII)

    Cl(VII)

    Cl(VII)

    Chris Bender, Lab Rat

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    I suspect you did, but did you check with Crazy Jim?
     
  4. Dec 4, 2018 #4

    Mendal

    Mendal

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    Does anyone have drawings or specs on these? I know its not an official closure but I'm just curious how others have achieved this? any good photos out there? I searched the forum but came up empty for the most part.
     
  5. Dec 4, 2018 #5

    Steve Shannon

    Steve Shannon

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    Following the accidents that happened at BALLS this year I don’t recommend head end ignition. Everything you want to do can be done more safely with an igniter inserted from the bottom, even in an upper stage.
     
  6. Dec 5, 2018 #6

    MClark

    MClark

    MClark

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    Aerotech was selling an HEI a few years ago
     
  7. Dec 5, 2018 #7

    rharshberger

    rharshberger

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    They still have it listed on their RCS website iirc.
     
  8. Dec 5, 2018 #8

    dshmel

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  9. Dec 5, 2018 #9

    Steve Shannon

    Steve Shannon

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    All initiators are single use.
    The Aerotech head end ignition system is the only one that I know of that permits adding the initiator after the motor has been completely assembled. That’s an improvement over those that require the initiator be in the motor the entire time the motor is assembled, but only if the user leaves the initiator out until the last possible moment.
    The HEI forward closure is reusable.
     
  10. Dec 5, 2018 #10

    Hybrid33

    Hybrid33

    Hybrid33

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    Is the forward closure available ?
     
  11. Dec 9, 2018 #11

    Viperfixr

    Viperfixr

    Viperfixr

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    I did...the production run finished long ago with no extras lying around.
     
  12. Apr 14, 2019 #12

    Viperfixr

    Viperfixr

    Viperfixr

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    bump...any AT or CTI HEI forward closures sale?? Especially 75 or 54mm.
     
  13. Apr 14, 2019 #13

    cwbullet

    cwbullet

    cwbullet

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    What happened at Balls?
     
  14. Apr 14, 2019 #14

    Steve Shannon

    Steve Shannon

    Steve Shannon

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    A flyer using copper thermite in a head end ignition system accidentally ignited a pretty good size motor thru static discharge (we strongly believe). He received a helicopter ride to a burn center in California. Fortunately his burns were less than originally thought. There’s several posts talking about it on TRF. I’m sure you saw them at the time. It’s just harder to avoid some kinds of accidents when using head end ignition. You’re working with a motor with its igniter already inserted.
     
  15. Apr 15, 2019 #15

    FredA

    FredA

    FredA

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    "It’s just harder to avoid some kinds of accidents when using head end ignition."

    Everything is harder than not really trying to be safe.....
    Let's not throw the baby out with the dirty bathwater, please.
     
  16. Apr 15, 2019 #16

    numbo

    numbo

    numbo

    Jimbo TRA 2142

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    The amateur tech for HEI is poor because they are so rare. If a few were made using the tech commercial motors use the techniques would start to spread. Even the most basic mechanical interrupts would be an improvement.
     
    Banzai88 likes this.
  17. Apr 15, 2019 #17

    Banzai88

    Banzai88

    Banzai88

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    That's a similar sentiment to the current revitalisation on 2 stages: Better tech is cheaper, widely avaliable, alway improving, and getting safer for the new user and ground based personnel all the time.
     

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