mini engines

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  1. R3verb

    13mm (mini) Screw on motor retention

    Why should the MPR and HPR guys have all the fun?? One of the things I LOVE about my MPR and HPR rockets right now is the screw-on motor retention. There's something very satisfying about screwing that motor in there nice and tight. At the moment, I'm taking a short break from building HPR stuff...
  2. Lukun7

    Larger 13mm motors?

    I have some Estes A10 engines that I want to fly in a custom rocket to have a high launch in a tiny rocket, so I was wondering if there are larger 13mm motors that can be classified as Bs or Cs, so if you know of any where could I get them or how could I make them with homemade rocket fuel...