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  1. #1
    Join Date
    19th August 2017
    Location
    Plainfield, IL
    Posts
    16

    Reducing ejection charge in CTI motors

    I have a PML Callisto with piston ejection. It works well except that it seems that the ejection charge in the CTI motors (G & H) seem to be too large and it is causing the piston to snap back into the airframe. Fortunately no airframe damage but there are some nicks in the piston.

    I want to remove the motor ejection charge and repack it with a smaller charge. Are there any gotchas I should look out for while doing this?

    Thanks,
    Jeff


  2. #2
    Join Date
    24th August 2013
    Posts
    576
    Quote Originally Posted by phyzzld View Post
    I have a PML Callisto with piston ejection. It works well except that it seems that the ejection charge in the CTI motors (G & H) seem to be too large and it is causing the piston to snap back into the airframe. Fortunately no airframe damage but there are some nicks in the piston.

    I want to remove the motor ejection charge and repack it with a smaller charge. Are there any gotchas I should look out for while doing this?

    Thanks,
    Jeff
    http://www.rocketryforum.com/showthr...arge&p=1761230


  3. #3
    Join Date
    19th August 2017
    Location
    Plainfield, IL
    Posts
    16
    Thanks. Not sure how I missed that one.
    Jeff

  4. #4
    Join Date
    19th January 2009
    Location
    Stafford VA
    Posts
    7,106
    I also have a Callisto I've been flying since 2003. I only use 0.5g of powder for ejection charges, but I only fly AT in it so it's pretty easy to adjust the powder. Once you figure out the amount you want to use, stick with it. Don't let a site condition change your mind. I've dealt with a few damaged components because I thought, "Oh, because of conditions today, using a little more will be OK". NOT!
    Handeman

    TRA #09903 L3 3/29/2015

    "If you don't use your head, you have to use your feet!" my Dad

    Tripoli Central Virginia #25 - BattlePark.org

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