Rocket Lesson of the Day

Discussion in 'The Watering Hole' started by cwbullet, Nov 10, 2019.

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  1. Nov 10, 2019 #1

    cwbullet

    cwbullet

    cwbullet

    Obsessed with Rocketry Staff Member Administrator TRF Lifetime Supporter Global Mod

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    When you assemble an a motor for use with electronic deployment, you still need a delay grain.

    Without a delay, the motor becomes a bidirectional fireworks fountain.
     
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  2. Nov 10, 2019 #2

    jd2cylman

    jd2cylman

    jd2cylman

    Still not Carl... ;-)

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    Pictures?
    Some lessons are more expensive than others...
     
  3. Nov 10, 2019 #3

    cwbullet

    cwbullet

    cwbullet

    Obsessed with Rocketry Staff Member Administrator TRF Lifetime Supporter Global Mod

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    When I get home.
     
  4. Nov 10, 2019 #4

    timbucktoo

    timbucktoo

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    Did it look anything like this? IMG_5531.jpg
     
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  5. Nov 11, 2019 at 12:06 AM #5

    cwbullet

    cwbullet

    cwbullet

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    That is pretty close. The sad thing is it happened to the same rocket twice in one weekend. This time it is gonna take a lot more repair work.
     
  6. Nov 11, 2019 at 1:23 AM #6

    blackjack2564

    blackjack2564

    blackjack2564

    Crazy Jim's Gone Banana's

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    RMRG5003.jpg poster92211698.jpg Yup, been there done that.
    J-90 long burn,in my original Wildman rocket,
    Without the delay it REALLY burned a looooooooooong time. The pic was cropped from Rockets mag and made into the infamous poster!

    I had the delay loaded and ready on table BUT was talking to someone and grabbed a empty closure and screwed it on...lol.......not paying attention.

    Same thing Chuck?
     
    Last edited: Nov 11, 2019 at 1:28 AM
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  7. Nov 11, 2019 at 1:31 AM #7

    BDB

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    Is this true even if you have a plugged forward bulkhead?

    I’m pretty sure I’ve flown Loki 38 mm motors with a plugged forward closure with no delay. Maybe I’ve just gotten lucky....
     
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  8. Nov 11, 2019 at 2:01 AM #8

    dhbarr

    dhbarr

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    Same if you overdrill the delay, my Mustang went out that way.
     
  9. Nov 11, 2019 at 2:33 AM #9

    Brent

    Brent

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    Did it happen yesterday too?
     
  10. Nov 11, 2019 at 3:25 PM #10

    dr wogz

    dr wogz

    dr wogz

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    Same can be said for CTI motors, when you forget to put the reload into the case (and just load the reload into the rocket) !!
     
  11. Nov 11, 2019 at 3:36 PM #11

    djs

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    Normally no- you wouldn't need this. However without a delay grain, you run the risk of putting the igniter in too far up and having trouble lighting the motor.
     
  12. Nov 11, 2019 at 3:49 PM #12

    Nytrunner

    Nytrunner

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    Master of Rivets

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    I love that picture. The mouth is in the perfect position

    upload_2019-11-11_9-49-19.png
     
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