Search found 10983 matches

by Mark
Mon Feb 16, 2026 9:00 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1856
Views: 1249306

Re: Odds and ends


That's a pretty weird setup.


One thing, if he had a larger fuel metering jet than standard for gasoline, maybe the needle valve could meter methanol or choke it down to run on gasoline which requires lower fuel per air ratio. When I bought my Bailey Jet, it came with 3 or 4 different brass ...
by Mark
Sat Feb 14, 2026 4:49 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1856
Views: 1249306

Re: Odds and ends

by Mark
Thu Feb 12, 2026 6:19 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1856
Views: 1249306

Re: Odds and ends

If you haven't seen Elements of Flight Propulsion by Foa, this last chapter on Non-Steady Flow Thrust Generators has some drawings of pulsejets toward the end of Chapter 15, if you pass through the graphs/math in the middle of the chapter to get there - just some tidbits maybe of interest.
Elements ...
by Mark
Sun Feb 08, 2026 5:08 pm
Forum: Off topic forum
Topic: youtube
Replies: 1552
Views: 933351

Re: youtube

I remember coming across Tyndall's book entitled SOUND while roaming the stacks at my university for something to read. Later I bought a copy, but you can have it from the link in the description too.
Super sensitive flame
https://youtu.be/zxVyhDf_IT4?si=PZHfpnvRKKg6iJDH

This passage on the ...
by Mark
Thu Jan 15, 2026 2:44 pm
Forum: Off topic forum
Topic: youtube
Replies: 1552
Views: 933351

Re: youtube

Thought this was a creative or unique use of a beer keg. Interesting how the keg stretches.
https://youtu.be/TzWWWmHvjkI?t=716
Plumbing a Liquid Rocket made of BEER KEGS - KegRocket Ep. 5
https://youtu.be/TzWWWmHvjkI?si=ZnowA_-KbWp78xKY

Brought to mind my repurposed keg, albeit a simplistic ...
by Mark
Thu Dec 18, 2025 4:25 pm
Forum: Off topic forum
Topic: youtube
Replies: 1552
Views: 933351

Re: youtube

Some pleasant scenery and such.
Viewer comment ...
"Still Committed to calling all the birds wrong I see"
Range Test of my Electric Micro Catamaran
https://www.youtube.com/watch?v=J9xfN8divSQ
by Mark
Mon Nov 10, 2025 6:50 pm
Forum: Off topic forum
Topic: youtube
Replies: 1552
Views: 933351

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: 1552
Views: 933351

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: 1856
Views: 1249306

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: 1552
Views: 933351

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: 1552
Views: 933351

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: 1552
Views: 933351

Re: youtube

by Mark
Fri Jul 04, 2025 2:26 pm
Forum: Off topic forum
Topic: Nature's Children
Replies: 702
Views: 545670

Re: Nature's Children

by Mark
Mon Jun 02, 2025 2:45 pm
Forum: Off topic forum
Topic: Nature's Children
Replies: 702
Views: 545670

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: 1552
Views: 933351

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