Will the Aerotech interlock controller simultaneously ignite 2 clustered D21-4T 18mm motors?

Discussion in 'Low Power Rocketry (LPR)' started by Funkworks, Apr 19, 2019.

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  1. Apr 19, 2019 #1

    Funkworks

    Funkworks

    Funkworks

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    I'm hoping to try my first clustered rocket soon, so I collected the following:

    - Rocketarium Viking 7
    - Rocketarium Two-motor cluster cable
    - Aerotech interlock controller
    - Aerotech D21-4T 18mm motors
    - Estes A, B and C motors

    I'm not worried about simultaneously igniting 2 black powder motors, but I find APCP motors to be slow to ignite, so how can I ensure the rocket won't take off before the second motor is burning?
     
  2. Apr 19, 2019 #2

    Nytrunner

    Nytrunner

    Nytrunner

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    Use a long lead cord and a stake next to the rod. Tie the cord at the top of the stake so the leads hang down to your rocket. Tape the igniters in place in the motors (with a little vent hole).

    If the rocket starts taking off, thatll give an extra millisecond before the other igniter is pulled out. Fortunately Blue Thunder is an easy to light propellant
     
  3. Apr 19, 2019 #3

    Funkworks

    Funkworks

    Funkworks

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    Sounds like a great idea!
     
  4. Apr 19, 2019 #4

    BABAR

    BABAR

    BABAR

    Builds Rockets for NASA TRF Lifetime Supporter TRF Supporter

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    Great idea. Using a longer rod or even better rail buttons and a long rail will maximize "opportunity time" for a second shy engine to come up to snuff.
     
  5. Apr 20, 2019 #5

    MALBAR 70

    MALBAR 70

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    To answer your question, yes the AT Interlock controller is a good choice for lighting composites. As long as you have a good 12 volt power supply, such as a portable car jump starter, you should have no problem lighting two 18mm D's.
     
  6. Apr 27, 2019 #6

    dpower

    dpower

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    Q-Jets are promising for clusters, even mixing with BP. Only a couple flights so far, but all have lit.
     

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