"Everyman's Jet Engine" - Why Valveless Pulsejets?
Strictly speaking, because we have no internal movable parts, we could build our engines with no parts
capable of being removed and replaced. However, I would advise against this -- there are a couple of
parts that deserve to be made easily replaceable. The fuel nozzle, at least in the case of liquid fuel
engines, should be set up so it can be removed and cleaned (or replaced) if it ever becomes clogged
or damaged during use. Another reason is that, even when we have a well-tuned engine that runs well,
the fuel nozzle is one of the most interesting things to change experimentally! I have seen hobbyists
actually weld a sparkplug into the chamber; but, if such an engine is dropped and the plug insulator
broken, replacing it will take time-consuming (and very careful) effort. Simply being able to thread
the old one out and replace it in five minutes makes a lot more sense to me!
- No replaceable parts except fuel nozzle (and optionally, spark plug)