Indeed it is a pulse jet. For anyone who isn’t familiar with these, what’s cool about them is how simple they are. They are literally some lengths of pipe welded together in a clever shape that can create compression and continuous combustion from a pressurized gas like propane. It’s a form of passive jet engine with no moving parts. Super easy to make, moderately powerful, and they don’t get very hot (by jet standards) which means you can make them from civilian-grade materials. The main issue is that they are loud as hell in person.
People are talking about helmets, but ear protection is what he really needs, standing that close to a pulse jet.
