Search found 10977 matches

by Mark
Mon Nov 10, 2025 6:50 pm
Forum: Off topic forum
Topic: youtube
Replies: 1548
Views: 900484

Re: youtube


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 ...
by Mark
Sun Nov 09, 2025 1:55 am
Forum: Off topic forum
Topic: youtube
Replies: 1548
Views: 900484

Re: youtube

Seemed like a first-timer.
This Pulse Jet is Insane
https://www.youtube.com/watch?v=EEVi6GkCaQ0
by Mark
Sat Oct 25, 2025 9:25 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1852
Views: 1214570

Re: Odds and ends

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 ...
by Mark
Fri Oct 24, 2025 1:00 am
Forum: Off topic forum
Topic: youtube
Replies: 1548
Views: 900484

Re: youtube

A lot of noise, maybe deaf cows.
You’ve Never Seen a Pulsejet Like THIS Before…
https://www.youtube.com/watch?v=cBlY9hsiH9U
by Mark
Sat Sep 20, 2025 4:11 pm
Forum: Off topic forum
Topic: youtube
Replies: 1548
Views: 900484

Re: youtube

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
by Mark
Thu Jul 10, 2025 11:34 pm
Forum: Off topic forum
Topic: youtube
Replies: 1548
Views: 900484

Re: youtube

by Mark
Fri Jul 04, 2025 2:26 pm
Forum: Off topic forum
Topic: Nature's Children
Replies: 702
Views: 526669

Re: Nature's Children

by Mark
Mon Jun 02, 2025 2:45 pm
Forum: Off topic forum
Topic: Nature's Children
Replies: 702
Views: 526669

Re: Nature's Children

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
by Mark
Fri May 16, 2025 10:25 pm
Forum: Off topic forum
Topic: youtube
Replies: 1548
Views: 900484

Re: youtube

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
by Mark
Mon May 12, 2025 7:58 pm
Forum: Off topic forum
Topic: youtube
Replies: 1548
Views: 900484

Re: youtube

A spike nut slowly building up to a high speed.
https://www.youtube.com/watch?v=A4DLpYVHbeI
by Mark
Sun May 04, 2025 10:52 pm
Forum: Off topic forum
Topic: youtube
Replies: 1548
Views: 900484

Re: youtube

Simple experiment with a cylindrical stainless steel cabinet knob
Acceleration of a Spinning Top
https://www.youtube.com/watch?v=DE9svCNR4So
by Mark
Sun May 04, 2025 10:46 pm
Forum: Off topic forum
Topic: youtube
Replies: 1548
Views: 900484

Re: youtube

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
by Mark
Thu Apr 03, 2025 1:44 am
Forum: Off topic forum
Topic: youtube
Replies: 1548
Views: 900484

Re: youtube

by Mark
Sun Mar 23, 2025 4:08 pm
Forum: Off topic forum
Topic: youtube
Replies: 1548
Views: 900484

Re: youtube

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
by Mark
Sat Mar 22, 2025 5:21 pm
Forum: Off topic forum
Topic: youtube
Replies: 1548
Views: 900484

Re: youtube

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