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Mark
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Re: youtube

Post by Mark » Fri Dec 29, 2017 2:04 am

Presentation is Everything

Mark
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Re: youtube

Post by Mark » Fri Dec 29, 2017 3:05 am

Mark wrote:
Sat Nov 27, 2010 4:18 pm
I was watching a show on sea snakes last night and this particular sea snake being of terrestrial origin can't lay it's eggs in water. So it lays them in this underwater cave. The neat thing about the cave was that a fog or cloud was generated when the waves created high and then low pressure variations. It reminded me of this plastic bottle demonstration.
http://www.youtube.com/watch?v=E8AvfXar9zs
There were better shots of the mist effect in the actual show.
Life Inside Look – Sea Snake Cave
http://www.bbcamerica.com/video-extras/ ... snake-cave
Presentation is Everything

Mark
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Re: youtube

Post by Mark » Wed Jan 03, 2018 4:36 pm

Around the 3:47 mark it looks like a brief clockwise circular motion is occurring instead of the typical jam jar torus, and at the neck,
the outflow flame segregating to the right.
The Whoosh Bottle Experiment | in Super Slow Motion!
https://www.youtube.com/watch?v=HcTRapGoHK8
Presentation is Everything

Mark
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Re: youtube

Post by Mark » Thu Feb 15, 2018 6:48 pm

Kind of a Logan look to it. Not wild about breathing smoke though, but interesting for a home-built and for the fact that it looks like a "working" pulsejet rather than recreational.
Home made PULSEJET Pulse jet engine Completion of smoke mist Katsuhiro Amemori
https://www.youtube.com/watch?v=ACv3wLlJl0s
Presentation is Everything

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Re: youtube

Post by tufty » Thu Feb 15, 2018 7:19 pm

Yum. Carby!

Mark
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Re: youtube

Post by Mark » Sun Mar 04, 2018 3:40 am

See if you can spot something funny.
Os pulse jet
https://www.youtube.com/watch?v=H4A4Qn4pInU
Presentation is Everything

Mark
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Re: youtube

Post by Mark » Sun Mar 04, 2018 7:13 pm

Might be exciting to try a jam jar jet at 2.5 atmospheres.
Opening a Soda on the Ocean Floor
https://www.youtube.com/watch?v=EJiUWBiM8HE
Presentation is Everything

Mark
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Re: youtube

Post by Mark » Sun Mar 11, 2018 4:10 am

I liked the inventive airing out method and the young teamwork and simple design using rocks in the second clip.
https://www.youtube.com/watch?v=hCdYExezMhU
https://www.youtube.com/watch?v=lIuj3gr8mgs
Presentation is Everything

Mark
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Re: youtube

Post by Mark » Wed Mar 21, 2018 10:28 pm

"Could not even maintain level flight"
Pulse jet glider - the 1955 Bocian Puls [Vintage Sky]
https://www.youtube.com/watch?v=MXKe1erYRDY
Presentation is Everything

Mark
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Re: youtube

Post by Mark » Thu Mar 22, 2018 2:31 pm

Interesting little vortex rings from leaks in the tailpipe.
Looking down a Pulse Jet Engine as it runs.!
https://www.youtube.com/watch?v=itzXhntGolc#t=42s
Presentation is Everything

Mark
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Re: youtube

Post by Mark » Thu May 31, 2018 7:28 pm

3D print your brain, timelapse, high-res microfluidics, custom colors...
https://youtube.com/watch?v=7Z8uPHL52Q0
Presentation is Everything

Mark
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Re: youtube

Post by Mark » Tue Aug 14, 2018 1:40 am

I wonder if you could start a Dyna-jet by angling the tail up say 30 degrees so that the fuel level in a clear/transparent fuel line could be carefully walked right up to the metering jet ready to go without entering or dribbling into the combustion chamber. Then with the combustion chamber filled with cotton and pure O2 fire the spark plug or perhaps try a tail end Bic lighter start where the initial whoosh and subsequent vacuum causes fuel to be drawn in the intake? If that didn't work perhaps fire the spark plug igniting the cotton/oxygen mix creating an impulse or bang start by corking the tailpipe to build up even more pressure, thus even more vacuum to draw in fuel. Cotton starting probably won't appeal or become popular though, but you could be the first on your block maybe.
On the other hand, things like sparkler starting seems so yesterday when you could be using cotton.
Cotton and pure oxygen whoosh bottle
https://youtube.com/watch?v=Ms62lnFVGaY
Presentation is Everything

Mark
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Re: youtube

Post by Mark » Fri Aug 17, 2018 1:50 pm

Mark wrote:
Tue Aug 14, 2018 1:40 am
I wonder if you could start a Dyna-jet by angling the tail up say 30 degrees so that the fuel level in a clear/transparent fuel line could be carefully walked right up to the metering jet ready to go without entering or dribbling into the combustion chamber. Then with the combustion chamber filled with cotton and pure O2 fire the spark plug or perhaps try a tail end Bic lighter start where the initial whoosh and subsequent vacuum causes fuel to be drawn in the intake? If that didn't work perhaps fire the spark plug igniting the cotton/oxygen mix creating an impulse or bang start by corking the tailpipe to build up even more pressure, thus even more vacuum to draw in fuel. Cotton starting probably won't appeal or become popular though, but you could be the first on your block maybe.
On the other hand, things like sparkler starting seems so yesterday when you could be using cotton.
Cotton and pure oxygen whoosh bottle
https://youtube.com/watch?v=Ms62lnFVGaY
A few other sources of cellulose. Might be fun to try a Cattail Barking Dog with pure oxygen and cattail fluff. Be the first on your block.
(Traditional barking dog)
https://youtube.com/watch?v=c3fJRRCAIdk

Anyway here's this ...
https://youtube.com/watch?v=m4tV1LCy0jk
https://youtube.com/watch?v=Bh--nnGdwX0
On fire with just air.
https://youtube.com/watch?v=sXxqz4BfLhA

Another source of fuel - cottonwood seeds
https://youtube.com/watch?v=v7G_5hzWqms
https://youtube.com/watch?v=yL8Y4-FsZlg
Presentation is Everything

Mark
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Re: youtube

Post by Mark » Tue Sep 18, 2018 2:34 am

Here's a curious fire tornado vs fire hose. Somehow in an abstract way I imagined a jam jar jet effect without the jar, the fuel cellulose instead of methanol and a chimney feedback effect without the chimney. Although the flow is more of a steady state, the center fire vortex might have resonate properties as it expands and contracts/collapses - pulsating or quivering in a vague sense.
https://www.instagram.com/p/BnwjbYfHwkB/

it brings to mind this other effect of a hollow tree producing a sound described as a roaring jet engine - an old post of mine with flames and the height of the tree adding up to a 170 foot spectacle.

Towards a wood fueled pulsejet.
"Many years ago when I was a young forester working in Western Montana for
the USFS we would often use hollow trees for our lunch fires, especially on
those days when the temperature was struggling to get above 0 degrees. In most
cases the trees were just hollowed out but sometimes nearly solid pitch
branch stubs filled the center of the tree like nails on a board. Most trees just
burned hot and gave us a nice lunch fire but I can remember a particularly
tall western larch that was broken off at about 120 feet....we didn't know
until the fire was set that the entire length of the tree was hollow and the
black smoke from the pitch was so thick that the ranger station forty miles away
got calls about a plane crash....the flames shot about another 50 feet from
the top of the tree and the roar was louder than any single tree fire I can
ever remember. My crew boss almost got fired for starting the tree because
the location on the mountain on a crystal clear Montana winter day made the
smoke visible for almost 100 miles."
"It was a crystal blue winter day with a high temperature of about 6 degrees
at noon. There wasn't a whisper of wind that day and when the pitch on the
inside of the hollow tree ignited the fire roared like a jet engine shooting a
plume of thick black smoke several hundred feet into the air....that is why
the crew boss got in trouble!!"
http://www.nativetreesociety.org/thread ... imneys.htm
Presentation is Everything

Mark
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Joined: Sat Oct 11, 2003 10:14 pm

Re: youtube

Post by Mark » Sat Oct 06, 2018 12:22 am

Thermoacoustic Heat Engine from Syringe. Part 2 (generator)
https://youtube.com/watch?v=rh78vsyGwXI
Presentation is Everything

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