| Pages:
1
2
3 |
Deathunter88
National Hazard
Posts: 519
Registered: 20-2-2015
Location: Beijing, China
Member Is Offline
Mood: No Mood
|
|
Quote: Originally posted by Morgan  | Yesterday I was misting some methanol into a gallon glass jug and lighting it to see what kind of whoosh it would make. It was a gallon jug such as
this and I was using a finger pump sprayer on the mist setting. It makes a pretty good whoosh.
http://www.uline.com/Product/Detail/S-18034/Jugs/Glass-Jugs-...
After that I decided to get out my platinum on alumina powder 1%. What happened next was quite impressive. I took the smallest amount of the talc-like
gray powder and placed it on a small piece of aluminum foil. Then I sprinkled the dust into the top of the methanol vapored jug. For two or three
seconds the particles floated down and into the jug glowing like a dozen or so red hot fireflies, seemingly weightless and twinkling in a most
mesmerizing fashion. It reminded me of carbon particles burning. And then it happened, the most terrific bang occurred blasting the tiny piece of foil
from my fingers like a bomb went off. Luckily the bottle didn't rupture but it was really impressive. It makes a big difference I guess if you light
the jug from the inside instead of at the opening and maybe multiple ignitions points played a part as well. It was so sudden and deafeningly loud,
from disarming fireflies to a flat out bomb. Not a hint of a rev up or pressure wave forming.
|
Please don't use a glass vessel when doing the whoosh bottle, there is a high risk of explosion from the pressure and the sudden heat change. Also,
the loud bang might had just been because you did not add enough methanol into the bottle. If the oxygen concentration inside is too high, you will
get a bang no matter if you added the platinum/alumina or not. <-just a theory form personal experience
|
|
|
Morgan
International Hazard
Posts: 1694
Registered: 28-12-2010
Member Is Offline
Mood: No Mood
|
|
| Quote: Originally posted by Deathunter88 | | Quote: Originally posted by Morgan | Yesterday I was misting some methanol into a gallon glass jug and lighting it to see what kind of whoosh it would make. It was a gallon jug such as
this and I was using a finger pump sprayer on the mist setting. It makes a pretty good whoosh.
http://www.uline.com/Product/Detail/S-18034/Jugs/Glass-Jugs-...
After that I decided to get out my platinum on alumina powder 1%. What happened next was quite impressive. I took the smallest amount of the talc-like
gray powder and placed it on a small piece of aluminum foil. Then I sprinkled the dust into the top of the methanol vapored jug. For two or three
seconds the particles floated down and into the jug glowing like a dozen or so red hot fireflies, seemingly weightless and twinkling in a most
mesmerizing fashion. It reminded me of carbon particles burning. And then it happened, the most terrific bang occurred blasting the tiny piece of foil
from my fingers like a bomb went off. Luckily the bottle didn't rupture but it was really impressive. It makes a big difference I guess if you light
the jug from the inside instead of at the opening and maybe multiple ignitions points played a part as well. It was so sudden and deafeningly loud,
from disarming fireflies to a flat out bomb. Not a hint of a rev up or pressure wave forming.
|
Please don't use a glass vessel when doing the whoosh bottle, there is a high risk of explosion from the pressure and the sudden heat change. Also,
the loud bang might had just been because you did not add enough methanol into the bottle. If the oxygen concentration inside is too high, you will
get a bang no matter if you added the platinum/alumina or not. <-just a theory form personal experience |
I've seen a few glass bottles explode and plastic ones as well but never one that "exploded" but still held together like the smallish gallon jug I
used. While I can't say for certain, it seems that even if I got a perfect methanol fuel/air ratio in the gallon jug, that it wouldn't go bang if I
lit it from the top and the glass didn't fatigue. There may be some influence of having the opening blocked by cold, dense air and ignition from the
interior as opposed to lighting the jug from the neck where initially there is less confinement.
The other day I was thinking about trying some methanol barking dog experiements where the flame front is initiated/sparked from various points inside
the tube instead of at the traditional exhaust end to see what would happen or what the proclivity is.
One site, Flinnscientific even goes so far to say never to use methanol. And plastic bottles should only be used a certain number of times. I agree
glass is not the best thing to be using.
Danger Will Robinson!
https://www.youtube.com/watch?v=TLB_oVPaW10#t=1m10s
I liked this one.
https://www.youtube.com/watch?v=BnHL_UlbUaI
Others
https://www.youtube.com/watch?v=yYj0U9AMBZc
https://www.youtube.com/watch?v=P7HzLO4eags
[Edited on 8-12-2015 by Morgan]
|
|
|
Morgan
International Hazard
Posts: 1694
Registered: 28-12-2010
Member Is Offline
Mood: No Mood
|
|
I came across this application of the ammonia/hydrochloric acid smoke reaction that was put to good use.
https://www.youtube.com/watch?v=95mCNQnyiBk
|
|
|
Morgan
International Hazard
Posts: 1694
Registered: 28-12-2010
Member Is Offline
Mood: No Mood
|
|
I had seen this demonstration before in several forms.
https://www.youtube.com/watch?v=a5EWVXrW28o#t=3m55s
But this one really buzzes before the big bang.
https://www.youtube.com/watch?v=snIv6uSeodU
[Edited on 22-7-2016 by Morgan]
|
|
|
Morgan
International Hazard
Posts: 1694
Registered: 28-12-2010
Member Is Offline
Mood: No Mood
|
|
| Quote: Originally posted by Morgan | I had seen this demonstration before in several forms.
https://www.youtube.com/watch?v=a5EWVXrW28o#t=3m55s
But this one really buzzes before the big bang.
https://www.youtube.com/watch?v=snIv6uSeodU
The previous clip with the buzzing hydrogen bomb reminded me of a foot long valved pulsejet I made using a washer and some .003ths blue tempered
spring steel for a single petal valve that covered the hole of the washer. I sanded the washer to a mirror smooth finish and the petal valve was
perfectly centered and sanded too to removed any burrs. I held the petal valve on with a tiny screw and nut. I'd prime the engine with methanol,
coating the insides with a squirt or two and one in the intake for good measure, but careful to not wet the reed too much. I then would light the tail
end. A curious thing happened, the flame front WOULDN'T instantly advance down the 1/4 inch plumbing pipe exhaust tube of the pulsejet. On several
occasions it would merely buzz ever so quietly for many seconds like a bee inside the tube, then out of nowhere it would kick in and the jet would
whine full grease, screaming loud in an instant. Sometimes though the jet would just backfire loudly or just instantly start up as well. And still
other times you could hear the flame walking up the tube, building in intensity until it hit the combustion chamber volume I guess which would set it
off running.
It was really fun to anticipate when the buzzing/gurgling would finally stop and the jet kick in. Sometimes it was almost whisper quiet, the petal
valve perhaps moving ever so slightly responding to the bubble/dome of fire residing in the tube, unable to advance down/up the tube. It was a little
purring kitten that out of nowhere killed your ears -- in an instant-on pulsejet fashion, much like the hydrogen bomb bee sound, before setting itself
off.
The tiny pulsejet used 3/4 inch pipe for the combustion chamber necking down to a 1/2 inch section and finally a 1/4 inch exhaust tube sort of like
this valveless pulsejet I tinkered with with the same diameter combustion chamber but shorter. When you coat the inside of a narrow diameter tube with
alcohol it is often fussy about the flame front wanting to travel the length unless the mixture and air temperature and humidity are just right.
Anyway I suppose you could also start a hobby size pulsejet using hydrogen and a stopper in the tailpipe with a pinhole in it and the tail end angled
up. Then you could listen to a buzzing delayed bang start ignition and have some methanol fuel feed take over and aspirated in the intake after
ignition on the negative pressure phase. It would be a little bit of work to set it up but funny to hear a buzzing hydrogen bomb effect suddenly
transition into a buzz bomb burning methanol - a two in one demonstration.
Similar in simplicity sans side port and front intake bell reducer and washer petal valve.
https://www.youtube.com/watch?v=W3mtr6DuXD0
And a bang start impulse example without the need of starting air to draw in liquid fuel.
https://www.youtube.com/watch?v=NU3cQ8_upWk
Or do a delay hydrogen buzz ignition to fire a can - hydrogen would probably be awfully perky though, I've had the bottom of the can deform just using
propane, from concave to convex and it's loud.
https://www.youtube.com/watch?v=kCppEmcRGCE
Hydrogen bomb eggs - a small scale no buzz but a delay effect
https://www.youtube.com/watch?v=L03LHMXrda4
[Edited on 24-7-2016 by Morgan] |
|
|
|
Morgan
International Hazard
Posts: 1694
Registered: 28-12-2010
Member Is Offline
Mood: No Mood
|
|
"Formally it was thought carbon dioxide was poisonous but now the opinion is that it causes death by excluding oxygen."
So thumbing through this book from 1921 there was the topic of the combustible being the supporter of combustion and vice versa. It was an interesting
demonstration how the flame could leave one tube and come over to the other or be teased to be somewhere in the middle, and that they used platinum
foil to keep the glass tubes from fusing.
And there's this other page 1,857 if you scroll down another page where they used coal gas to illustrate the same thing, having a glass sphere where
out the top is a flame of coal gas burning and simultaneously inside the sphere you see a flame of air burning in coal gas.
Anyway, if you scroll down a few pages you can see illustrations of the designs. I guess if you weren't careful setting it up, the sphere would be
like one of those hydrogen bomb demonstrations.
Audels engineers and mechanics guide
https://books.google.com/books?id=CPxYAAAAYAAJ&pg=PT104&...
 
[Edited on 25-7-2016 by Morgan]
|
|
|
Morgan
International Hazard
Posts: 1694
Registered: 28-12-2010
Member Is Offline
Mood: No Mood
|
|
Unplanned outcomes.
https://www.youtube.com/watch?v=BP9WkNVcmxo
http://www.foxnews.com/us/2010/07/19/men-burned-wash-state-m...
|
|
|
Morgan
International Hazard
Posts: 1694
Registered: 28-12-2010
Member Is Offline
Mood: No Mood
|
|
"I have no idea what's even going to happen."
https://www.youtube.com/watch?v=qUKiw75pWy8#t=5m26s
Two more flying lids.
https://www.youtube.com/watch?v=qUKiw75pWy8#t=12m6s
[Edited on 12-6-2017 by Morgan]
|
|
|
Morgan
International Hazard
Posts: 1694
Registered: 28-12-2010
Member Is Offline
Mood: No Mood
|
|
Patio Heater Glass Tube VS Quartz Tube
https://www.youtube.com/watch?v=xyUtriix_N0
|
|
|
Morgan
International Hazard
Posts: 1694
Registered: 28-12-2010
Member Is Offline
Mood: No Mood
|
|
In an old chemistry manual there was mention of dry ammonia gas dissolving so fast in water that it can crack a flask. Here's something similar that
demonstrates the sudden affinity for water around the 25 second mark.
https://www.youtube.com/watch?v=vgBe0fsPcjk
|
|
|
mayko
International Hazard
Posts: 1218
Registered: 17-1-2013
Location: Carrboro, NC
Member Is Offline
Mood: anomalous (Euclid class)
|
|
The Riejke Tube, also called the Hoot Tube:
https://www.youtube.com/watch?v=pncG3lJUOdY
al-khemie is not a terrorist organization
"Chemicals, chemicals... I need chemicals!" - George Hayduke
"Wubbalubba dub-dub!" - Rick Sanchez
|
|
|
Morgan
International Hazard
Posts: 1694
Registered: 28-12-2010
Member Is Offline
Mood: No Mood
|
|
Bored, I took a 25mm X 1000mm quartz tube with an inside diameter of 19mm and heated one end with a TS4000 Bernzomatic propane torch for over a minute
getting the end ~7.5cm of length as hot as possible. Then it was quickly submerged in a pot of cold water. In addition the tube had been
scratched/scored about 7.5cm from the end in a vague attempt to see if it would make a clean break if thermally shocked. The 3mm walled fused quartz
refused to crack and merely boiled the water fiercely around the glass. It was just sort of uncanny because I was inclined to think it would have a
good chance of cracking, recalling the above video in which sprinkling the quartz heater tube with water seemed kind of iffy.
Here's a piece of the tubing carrying light from my leveling laser - old photos. (Yawn)
http://www.pulse-jets.com/phpbb3/download/file.php?id=13694&...
The 15 tube box for sale that I bought on eBay.
http://www.pulse-jets.com/phpbb3/download/file.php?id=10539&...
Toying with piece of it and a quartz crucible.
http://www.pulse-jets.com/phpbb3/download/file.php?id=13710&...
[Edited on 19-6-2017 by Morgan]
|
|
|
Praxichys
International Hazard
Posts: 1063
Registered: 31-7-2013
Location: Detroit, Michigan, USA
Member Is Offline
Mood: Coprecipitated
|
|
@ Morgan - It looks like maybe you were setting up a quartz pulsejet in that last pic?
I used to be really involved with those back when aardvark.co.uk was big, before his government thing.
|
|
|
Morgan
International Hazard
Posts: 1694
Registered: 28-12-2010
Member Is Offline
Mood: No Mood
|
|
It was just something to dabble with, to see how it would gurgle or flutter if held in the vertical supplied with some alcohol for fuel. It didn't
have much confinement. The annular pulsejet thought crossed my mind although I didn't really give it much more than a few tries.
http://www.pulse-jets.com/phpbb3/download/file.php?id=13711&...
http://www.pulse-jets.com/phpbb3/download/file.php?id=13716&...
http://www.pulse-jets.com/phpbb3/download/file.php?id=13715&...
Here's an example of one someone made that works.
"This engine is unique because the intake is annular--that is, it surrounds the exhaust tube."
https://www.youtube.com/watch?v=WHDTxfiZXyc
This one is kind of different/more complex the way the airflow works if you enlarge the top diagram/figure 1 and follow the arrows.
http://www.pulse-jets.com/phpbb3/download/file.php?id=14227&...
It's sort of fun to just play with quirky shapes putting them all out on a table and wonder what might come about or emerge by placing certain parts
in proximity, little fragments with their own unique properties or proclivities.
http://www.pulse-jets.com/phpbb3/download/file.php?id=12783&...
|
|
|
Morgan
International Hazard
Posts: 1694
Registered: 28-12-2010
Member Is Offline
Mood: No Mood
|
|
Here's a few tests I did akin to the above.
https://www.youtube.com/watch?v=JWDlfrOAw0E
https://www.youtube.com/watch?v=IHnM3fIhntA
[Edited on 23-6-2017 by Morgan]
|
|
|
Morgan
International Hazard
Posts: 1694
Registered: 28-12-2010
Member Is Offline
Mood: No Mood
|
|
Bologna Bottle and Glass Demonstration
https://www.youtube.com/watch?v=xc1whrZGOZI
Triggered with SiC
https://www.youtube.com/watch?v=DAmNmWpxo8Q
(Perhaps a single tiny particle of SiC would be enough)
I remember watching a show on PBS with Dale Chihuly in Seattle where they were making large artistic pieces of glass in a very spacious high ceiling
building with music playing as they worked. He was miffed they had made a work of art for Elton John and he offhandedly asked the students if they had
stress-relieved the piece and apparently not which meant it could explode sometime in the future out of the blue. I can't recall if it had been
shipped or just waiting to be packed or packed already.
[Edited on 24-6-2017 by Morgan]
|
|
|
Morgan
International Hazard
Posts: 1694
Registered: 28-12-2010
Member Is Offline
Mood: No Mood
|
|
Bologna Flasks
"Bologna flasks (or bottles) are blown with the glass pipe like an ordinary small thick walled flask. The only difference is that instead of putting
the red hot flask into the lehr to anneal it free from strains, it is left out in the cold air. This works in a similar way as intentional quenching
on the outside, but much less so in the interior. Therefore, the flask is toughened only on the outside, while even a tiny scratch with a hard tip on
the interior walls leads to explosion. German encyclopaedias (Meyer 1885) ascribe the invention to a Mr. Asmadei in 1716. It must have been discussed
all over Europe in the 1740s, as the list of early literature in Krünitz (1780) shows. It was presented to the Bolognese Academy of Sciences and Art
by Balbi in 1745. ‘Bologneser Flaschen’ are also known in German as ‘Springkolben’ (literally ‘shatter flasks’)."
Modern Thermally Toughened Glass
"De la Bastie’s invention was of no great practical use because the glasses could not be quenched evenly. The resulting stresses often lead to
failure after months without apparent external cause. Even the modern technique of working with a stream of cold air can only toughen open forms like
sheets (e.g. car side windows), plates, or cups. The French glass company Arcoroc (2007) produces such a ‘verre trempé’ which can be used to
demonstrate the increased fracture strength."
EXPERIMENT 3
"A plate of ‘verre trempé’ resists blows with a hammer. The tip of a normal nail gets flattened on trying to hammer it into the plate. Even
hardened nails often do not suffice to crack the glass. It needs special pointed hammers (no nails) such as those provided to create emergency exits
through windows in cars or buses to shatter such a plate."
(From reference 3 in Wikipedia)
https://en.wikipedia.org/wiki/Bologna_bottle
"Theses glasses when they have received the first injury do not always crack immediately, but remain whole sometimes a few minutes, sometimes for
hours, and then suddenly give way."
https://books.google.com/books?id=Yt8_AQAAIAAJ&pg=PA158&...
[Edited on 25-6-2017 by Morgan]
|
|
|
Morgan
International Hazard
Posts: 1694
Registered: 28-12-2010
Member Is Offline
Mood: No Mood
|
|
I wouldn't normally post whistling bottles but this amped-up version probably improves the speed to some extent by confining the exhaust in the
barrel. One time though when I was using a 3 liter bottle and methanol the bottle shot so fast you couldn't follow it with your eye with just a hole
in the cap and no launcher. So you can get some high speed without a launcher but here he's using smaller bottles and rubbing alcohol which could be
ethanol or more probably isopropyl alcohol which isn't quite as zippy/fast as methanol, maybe 80 or 90 percent as good perhaps. The fire as the bottle
leaves the launcher is kind of a nice effect.
How to Build a 4 Barrelled Rocket Launcher
http://con.ca/view/news/12042-How-to-Build-a-4-Barrelled-Roc...
[Edited on 30-6-2017 by Morgan]
|
|
|
Morgan
International Hazard
Posts: 1694
Registered: 28-12-2010
Member Is Offline
Mood: No Mood
|
|
| Quote: Originally posted by Morgan | "Formally it was thought carbon dioxide was poisonous but now the opinion is that it causes death by excluding oxygen."
So thumbing through this book from 1921 there was the topic of the combustible being the supporter of combustion and vice versa. It was an interesting
demonstration how the flame could leave one tube and come over to the other or be teased to be somewhere in the middle, and that they used platinum
foil to keep the glass tubes from fusing.
And there's this other page 1,857 if you scroll down another page where they used coal gas to illustrate the same thing, having a glass sphere where
out the top is a flame of coal gas burning and simultaneously inside the sphere you see a flame of air burning in coal gas.
Anyway, if you scroll down a few pages you can see illustrations of the designs. I guess if you weren't careful setting it up, the sphere would be
like one of those hydrogen bomb demonstrations.
Audels engineers and mechanics guide
https://books.google.com/books?id=CPxYAAAAYAAJ&pg=PT104&...
[Edited on 25-7-2016 by Morgan] |
I noticed this video with similar subject matter.
https://youtube.com/watch?v=KTZcnCqqfG4
If you scroll up the page to my original post, there's better pictures of the demonstrations than in the link provided. I would have liked to run a
jam jar jet reversing the rolls of the combustible becoming the supporter of combustion.
Or here ...
http://www.sciencemadness.org/talk/files.php?pid=455934&...
http://www.sciencemadness.org/talk/files.php?pid=455934&...
[Edited on 6-5-2018 by Morgan]
|
|
|
Morgan
International Hazard
Posts: 1694
Registered: 28-12-2010
Member Is Offline
Mood: No Mood
|
|
This whoosh bottle caught my attention unique for its simplicity and snowy rain. I suppose/obviously you could make a gun using a kind of simple
"'guncotton" impulse effect. Or maybe it would be possible to construct a spritely barking dog tube variation on a theme if the fibers didn't dampen
feedback too much. Get professor Poliakoff and staff to work on it.
Other corridors of exploration might lead to other novel uses for cotton flambe' as ideas evolve - whatever entertaining niche springs to life, meager
or not.
Cotton and pure oxygen whoosh bottle
https://youtube.com/watch?v=Ms62lnFVGaY
[Edited on 14-8-2018 by Morgan]
|
|
|
symboom
International Hazard
Posts: 1143
Registered: 11-11-2010
Location: Wrongplanet
Member Is Offline
Mood: Doing science while it is still legal since 2010
|
|
Refering to texiums post
He bring up good points.
We made close to all of the elements
On the periodic table.
http://www.sciencemadness.org/talk/viewthread.php?tid=87955
Quote by texium
The only journal I truly desire to publish in is the one we're going to make right here.
Aga would be proud. Saying we dont do chemistry.
[Edited on 15-8-2018 by symboom]
|
|
|
Morgan
International Hazard
Posts: 1694
Registered: 28-12-2010
Member Is Offline
Mood: No Mood
|
|
| Quote: Originally posted by Morgan | This whoosh bottle caught my attention unique for its simplicity and snowy rain. I suppose/obviously you could make a gun using a kind of simple
"'guncotton" impulse effect. Or maybe it would be possible to construct a spritely barking dog tube variation on a theme if the fibers didn't dampen
feedback too much. Get professor Poliakoff and staff to work on it.
Other corridors of exploration might lead to other novel uses for cotton flambe' as ideas evolve - whatever entertaining niche springs to life, meager
or not.
Cotton and pure oxygen whoosh bottle
https://youtube.com/watch?v=Ms62lnFVGaY
[Edited on 14-8-2018 by Morgan] |
A few other sources of cellulose. Might be fun to try a Cattail Barking Dog with pure O2.
Anyway here's this ...
https://youtube.com/watch?v=m4tV1LCy0jk
https://youtube.com/watch?v=Bh--nnGdwX0
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
|
|
|
Morgan
International Hazard
Posts: 1694
Registered: 28-12-2010
Member Is Offline
Mood: No Mood
|
|
On this topic of the Cotton and pure oxygen whoosh bottle
https://youtube.com/watch?v=Ms62lnFVGaY
I was wondering if pure oxygen would diffuse into kapok fibers over time time so that you could load the fibers up with enough O2 to be used as a
whoosh bottle or simple primitive rocket fuel of sorts, providing a quick burst or impulse without the need for additional oxygen - the idea being to
just stuff some into a bottle or tube and light it.
The fibers are quite flammable as is.
"The kapok fiber once used in floatation vests and has been used as building insulation has a hollow fiber and looks like glass fiber under the
microscope. The hollow fiber has air inside allowing combustion deep inside the material. Smoldering fire and open flame travel quickly within the
material."
"Typical analyses indicate that the Kapok fibers comprise 64% cellulose, 13% lignin and 23% pentosan. Besides these constituents, they also contain
wax cutin on the fiber surface which makes them water repellent notwithstanding they are preponderantly composed of cellulose."
https://www.textileschool.com/amp/183/kapok-or-capok-fibres
Wiki
Native tribes along the Amazon River harvest kapok fibre to wrap around their blowgun darts.
Kapok fibre is light, very buoyant, resilient, resistant to water, but it is very flammable.
It is inflammable: the trapped air makes kapok highly inflammable, and if it catches fire it is difficult to put the fire out. Special precautions are
needed to transport kapok in the hull of ships. One advantage of this characteristic is that kapok can be used as tinder.
http://www.wildfibres.co.uk/html/kapok.html?redirect=false
"The fibres contains approx. 80% air, it has thin walls of cellulose with many cavities.
Kapok fibre is 8 times lighter than cotton."
http://www.ceiba.dk/?page_id=214&lang=en
Or maybe try storing kapok in a hydrogen atmosphere to see if H2 would permeate the hollow fibers. Then after a week take it out and see how it
burns.
[Edited on 18-8-2018 by Morgan]
|
|
|
Morgan
International Hazard
Posts: 1694
Registered: 28-12-2010
Member Is Offline
Mood: No Mood
|
|
It's funny you can buy a jam jar jet ready-made and not have to make the hole in the lid due to the advent of drinking jars. These jars come with a
straw and little grommet that can be easily removed leaving a hole adequate for jam jarring. I saw some yesterday like this jar with straw but without
the handle for $2.00 at a dollar store. There are a million colors if you search Google, metalized silver, gold, titanium oxide hues, etc.
https://www.deadrockers.net/products/glass-skull-drinking-ja...
Another examples
https://www.bedbathandbeyond.com/store/product/skull-shaped-...
https://www.popsugar.com/smart-living/photo-gallery/44057691...
When I bought a couple of the jars sometime back, they came with lids without holes that were ill-fitting, having no gasket to seal around the rim of
the glass, so I used spaghetti jar lids to get them to not leak air pressure or fuel, like when putting your finger over the hole and shaking the jar
before ignition to prime it for starting. In this clip the lighter was placed over the holes to stop them prematurely, to avoid cracking.
https://youtube.com/watch?v=Z-oOYF7EDYk
In summary, there's not much easier if you wanted a jam jar jet without drilling a hole, it's even centered if you wanted to widen it for a slower
running jar or for energetic cool dry air where a smaller hole is too restrictive and the jar too perky and suddenly flames out.
Lots of shapes to toy with
https://perfectplants.co.uk/retro-jam-jar-glass-drinking-jar...
https://dhgate.com/product/4pcs-creative-color-gradient-glas...
https://dhgate.com/product/new-style-glass-cactus-mason-jar-...
https://www.amazon.com/Twos-Company-Drinking-Bottles-Straws/...
https://youtube.com/watch?v=KJidOHrPpEo
[Edited on 17-8-2019 by Morgan]
|
|
|
Morgan
International Hazard
Posts: 1694
Registered: 28-12-2010
Member Is Offline
Mood: No Mood
|
|
Here's some ready-made jam jar jets you could use for a classroom demonstration of pulsating combustion. The little jars were 1 dollar purchased at
Target stores. I noticed them just as you walk in the store, where they have dollar objects mostly for kids and craft items and such.
Store-bought Jam Jar Jets
https://youtube.com/watch?v=GEgXyf2NevM
Day of the Dead Jam Jar Jets
https://youtube.com/watch?v=vY8vpUiFins
|
|
|
| Pages:
1
2
3 |
![[*]](images/xpblue/default_icon.gif){kind=icon}
