youtube

[metiz]

That's awesome! Thanks for the share Mark

[Mark]

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

[tufty]

That looks like a pretty well made motor.

[Mark]

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 though. My Tiger and Bailey both use a tiny 1/4 32 thread spark plug.
download/file.php?id=14465&mode=view
My little Tiger Jet running
https://www.youtube.com/watch?v=H2xTYTzutig

From a link posted in his video.
https://www.stirlingkit.com/products/pu ... 9273965781
His engine and details.
https://www.stirlingkit.com/products/20 ... jet+engine

[Mark]

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

[Mark]

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 modification as a snorkeler.
Jam Jar Boat Ballast Testing
https://www.youtube.com/watch?v=CrtuP-8JMuE
Jam Jar Snorkeler Twenty Minute Run
https://youtu.be/hgyINU88Iv0?si=tnvugfi-vH7ghrpF

Ambiguous fun facts
5. Burst pressure – Stainless steel kegs are rated for an internal pressure of at least 60 to 90 PSI without deformation, with a burst pressure of at least 300 PSI. The safety factors for burst pressure is usually about three to four, so the new keg does not actually rupture until it is exposed to 1000 PSI internal pressure or more. A lot of the new kegs can be purchased with a special pressure relief-valve in the form of a burst disc, which is a small circle stamp on the bottom dome of the keg, which is designed to break out at a certain design pressure to prevent the valve from becoming the weakest point of the pressure vessel. Never intentionally pressurize the keg to more than the design pressure using compressed air, to prevent damage to the keg or worse injuring yourself or innocent bystanders. The reason for this is that while liquid is incompressible, air can be compressed to the point of becoming very dangerous, like a rocket or a torpedo. When de-denting kegs to remove volume impacting dents, it has to be done using liquid and not air, and this procedure should only be done by professional keg service companies.
https://probrewer.com/library/kegs/keg-safety/

Bursting
Alteration of burst flap
https://youtu.be/1iiw5e1_bpM?t=181
About 1200 psi
https://youtu.be/1iiw5e1_bpM?t=416
Tidbit
https://youtu.be/zgBUbVlf5lE?t=226

[Mark]

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 sensitivity of a flame always stayed with me when I read it long ago.
"When a bunch of keys is shaken the flame is violently agitated and emits a loud roar. The dropping of a sixpence into a hand already containing coin, at a distance of 20 yards, knocks the flame down. It is not possible to walk across the floor without agitating the flame. The creaking of boots sets it in violent commotion. The crumpling, or tearing of paper, or the rustle of a silk dress, does the same. It is startled by the patter of a raindrop. I hold a watch near the flame: nobody hears its ticks; but you all see their effect upon the flame. At every tick it falls and roars. The winding up of the watch also produces tumult. The twitter of a distant sparrow shakes the flame; the note of a cricket would do the same. A chirrup from a distance of 30 yards causes it to fall and roar."
(Page 238)
https://archive.org/details/b28111394/page/238/mode/2up

[Mike Everman]

Ha, makes me think of the butterfly effect, only instantly gratifying. Thanks, Mark.