/sci/ - Science & Math

Sorry for dumping this question here, but I need an outside opinion. Which NPT pipe size should I use for a small liquid propellant rocket engine? 1/8 or 1/2? I'm leaning to 1/8 because that's the size the pipe needs to be before it connects to the decomposition chamber and thus having all my piping in this size means that I don't have to get reducers, but 1/8NPT valves and solenoids seem rarer. 1/2NPT seems to be more common and it's used on some small rocket engines already.

Just for context, I don't know what pipe size my propellant tank connects to so either size is equally likely to require an adapter. Thanks in advance.