www.pulse-jets.com

That looks like a pretty well made motor.


The welding seams are much smoother than my Dyna-Jet or smaller Tiger Jet. The Bailey Jet I bought has very smooth seams too. I recall seeing some Dyna-Jets with rather blobby welding. Seems like he could spring for a smaller or shorter spark plug ...

Seemed like a first-timer.
This Pulse Jet is Insane
https://www.youtube.com/watch?v=EEVi6GkCaQ0

Seems like I remember something about the linear or near linear Schmidt Tube pulse jet developing the highest peak pressures but can't recall a reference, perhaps Tharratt or F.H. Reynst's literature?
"The Aeromarine 8-inch pulsejet from around 1958 I believe. One of the most powerful and efficient ...

A lot of noise, maybe deaf cows.
You’ve Never Seen a Pulsejet Like THIS Before…
https://www.youtube.com/watch?v=cBlY9hsiH9U

This would make me nervous if you got the fuel/air ratio just right and if for some reason the flame front behaved differently.
205L Pulsejet Test in River - Flames, Smoke, and Chaos!
https://www.youtube.com/shorts/PSA31OpRtJ0

Pulse Engine Fan Model
https://youtube.com/shorts/KsEHqoLhT5s?feature=shared

Gobi high climbing
https://youtu.be/mmwM7dwtvKA?feature=shared

Sound check and resonate frequency tuning to the hole.
Frog's Incredible Mating Technique | Earth's Tropical Islands | BBC Earth
https://www.youtube.com/watch?v=WWohDFKmB7U

I got a CM-6 10mm spark plug to buzz by running it upside down on this acrylic sheet, but here's an even smaller upside down 1/4 32 glow plug slowly getting up to speed. It's noisy for a small spinning top.
Glow Plug Spinning Top
https://www.youtube.com/watch?v=PoKMmjUdC9g

A spike nut slowly building up to a high speed.
https://www.youtube.com/watch?v=A4DLpYVHbeI

Simple experiment with a cylindrical stainless steel cabinet knob
Acceleration of a Spinning Top
https://www.youtube.com/watch?v=DE9svCNR4So

For one of those intermittent unstable contraptions, the effect of building some feedback, albeit momentarily, it was a somewhat unusual transition, for not having any typical fueling feeding it.
https://www.youtube.com/watch?v=OuwNt4WLnyg

Interesting ending
https://youtu.be/ksw3V8MXZKw?feature=shared

Spinning tops from the sea
https://www.youtube.com/watch?v=DdlQ0cM4uU0

Finger top spins 4 hours in the vacuum.
https://www.youtube.com/watch?v=Xah0ONSoq1k

"But rotation around what?"
Dartmouth Professor Discusses Foucault's Pendulum
https://www.youtube.com/watch?v=aMxLVDuf4VY&t=101s