mini engines

Hi Rocket-ers, Hope you are all doing great! I'm going to build a micro-newton thrust stand to measure the thrust (from 10s of micro-newton to few 100 mN) from a miniaturized electric thruster. Can anyone suggest me whether it is recommended to use linear translational stage or any other...

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...

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...