Search found 10791 matches

by Mark
Tue Dec 10, 2019 6:06 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1749
Views: 339476

Re: Odds and ends

It may be that the smallish volume of the 11 ounce Guinness beer bottle isn't quite large enough to match the flow of the snorkel here. Recall this snorkel was used on the previous Radnoti glass experiment. On the other hand a larger snorkel on the Radnoti would make more thrust and sound. Restricti...
by Mark
Tue Dec 10, 2019 1:47 am
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1749
Views: 339476

Re: Odds and ends

Well I finally got around to using the Radnoti glass you sent me Mike. It's had some strong revs with larger diameter tubing too. Very fast combustion requires very precise fueling and seemingly exacting selection of tubing size. It can cause quite a bit of dismay all the lengths and diameters that ...
by Mark
Sun Dec 08, 2019 4:38 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1749
Views: 339476

Re: Odds and ends

There are not many thrust tests on jam jars but I did find this one.
https://www.youtube.com/watch?v=p23NGY7Lgek
by Mark
Sat Dec 07, 2019 6:09 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1749
Views: 339476

Re: Odds and ends

Tidbits aside from moisture taking up space that would otherwise contain more O2 and N2. "The atmospheric pressure, temperature and humidity all affect the density of the air. On a hot day, or at high altitude, or on a moist day, the air is less dense. A reduction in air density reduces the amount o...
by Mark
Sat Dec 07, 2019 6:08 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1749
Views: 339476

Re: Odds and ends

I did a couple of trials on the Seltzer Jet and it produced a thrust of a little over 360 grams or about 12.7 ounces of sound! On an ideal weather day and/or tuned snorkel to seltzer tank it seems conceivable to achieve a pound of thrust. A pound of thrust would be a little over a half the static th...
by Mark
Sat Dec 07, 2019 3:15 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1749
Views: 339476

Re: Odds and ends

Although a wind chime calculator video and stuff, this was kind of interesting. If you skip to the 25 minute mark he talks about the missing fundamental of a tube that should be making C2 or 60 Hz, something obvious but I hadn't thought of, the "naked chime" effect. I noticed the same effect I think...
by Mark
Fri Dec 06, 2019 9:06 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1749
Views: 339476

Re: Odds and ends

Seltzer Jet Ramblings ... Although seemingly rather subdued as it flags and dies, the effect belies or gives a false impression because this Seltzer jet is actually pretty loud. I ran it in my garage with the garage door cracked about about a foot hoping to minimize noise to my neighbors. I will get...
by Mark
Thu Dec 05, 2019 2:51 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1749
Views: 339476

Re: Odds and ends

I ordered a decibel meter just to see what kind of sound is being produced with jam jars and such. Inquiring about them, a few comments came in. "If you've a half decent smartphone, look for any number of free apps which use your phone's hardware to act as a decibel meter. Some of them seem to work ...
by Mark
Wed Dec 04, 2019 4:57 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1749
Views: 339476

Re: Odds and ends

One thing that came to mind is that the ability to sleeve the snorkel to any depth in the neck is very useful, instead of just toying with length and diameter from a fixed point at the top of the bottle. Perhaps by lowering the snorkel deep into the bottle neck, the flame entering into bottle doesn'...
by Mark
Wed Dec 04, 2019 12:10 am
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1749
Views: 339476

Re: Odds and ends

Another bottle but this time I have a scale to measure the thrust. It's about what I expected around 4 ounces yet by no means optimized I don't think. The sound is louder than it appears on youtube. The 2 ml silicone jar gasket is an ideal fit yet it also allows the exhaust tube depth to be adjusted...
by Mark
Thu Nov 28, 2019 11:07 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1749
Views: 339476

Re: Odds and ends

In the quest for new "Will it Jam" jars, I finally got around to getting a chemistry flask to run. It's very fussy about too much or too little fuel. Yesterday the first test with this exact same snorkel was on a 1000 ml flask, twice the volume as the one seen here. I used a gloved hand over the top...
by Mark
Tue Nov 26, 2019 1:59 am
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1749
Views: 339476

Re: Odds and ends

Another shape of bottle is found to work as a jam jar jet snorkeler. It seems to run pretty steady for a time without any misfires. The snorkel is probably undersized in length and diameter and not idealized for thrust. Imagine though a short flight toy plane powered by this simple shape in aluminum...
by Mark
Mon Nov 25, 2019 3:42 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1749
Views: 339476

Re: Odds and ends

These are some "informal" no thought put into them shots just to show the versatility of silicon jars and silicone rubber bands used singularly or in combination in order to press-fit various tubes into bottles. And some bamboo being used as tubing just for the fun of it. One advantage of bamboo is ...
by Mark
Wed Nov 20, 2019 1:58 am
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1749
Views: 339476

Re: Odds and ends

So it runs OK for a plant I guess. Maybe I'll work on it some.

Nature's Jam Jar Jet
https://www.youtube.com/watch?v=Ej-djmTnvYo
by Mark
Tue Nov 19, 2019 1:05 am
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1749
Views: 339476

Re: Odds and ends

This second run did a little better in the speed department and not even the lid was too hot to keep my hand pressed against it immediately after the run! The bamboo I held for maybe a minute and the heat then started to penetrate to the outside where I thought it was going to get too hot to hold bu...