>>(My guess is that it would, with minor modifications, be 'flyable' in >>the sense that someone could get a rocket off the ground with it; it's >>just 'not flyable' in the sense that this is never what you'd choose >>to fly with. Unless somehow a big concrete anchor plays an >>irreplaceable role in its functioning...) I think that’s an interesting point and it’s something I did consider before putting in my request. However, I came to the conclusion that it was unlikely anyone could ever fly it. The engine generates a maximum of about 13 lbf of thrust but just the engine components alone weigh about 8 lbs. Note - this doesn’t include tanks, valves, etc… I suppose someone very clever could figure out how to do it but it would take an extreme amount of engineering to do. Currently, I’m not really interested in flyable engines as anything big tends to be a bit more dangerous and require more infrastructure/time investment then I have right now. I’d like to mainly focus on low-impulse engines and do things like aerospikes as well as possibly a turbine pump. Essentially just work on unique interesting designs rather then anything massive. At least in the near term anyway…