Search found 10820 matches

by Mark
Sun Nov 08, 2020 2:27 am
Forum: Off topic forum
Topic: youtube
Replies: 1465
Views: 260478

Re: youtube

The round shape approach reminded me of the drawing in Reynt's book of sphere with twin exhaust tubes 180 degrees apart. Also Leo's design. https://youtube.com/watch?v=1QD7U0ogXWM "For those with a longer attention span" ha Pulse Jet Pumpkin https://youtube.com/watch?v=MV46oheGC94 It was painful to ...
by Mark
Sun Oct 25, 2020 4:21 pm
Forum: Off topic forum
Topic: youtube
Replies: 1465
Views: 260478

Re: youtube

What I thought was interesting is how light and how long the pulsejet was, it looked like 33.73 grams, but I couldn't tell which measurement was the thickness of the shim stock he used to roll and weld it to make tubing? I wonder how thin you could make a small jet like that? It seemed about 70 cm l...
by Mark
Fri Oct 23, 2020 9:02 pm
Forum: Off topic forum
Topic: youtube
Replies: 1465
Views: 260478

Re: youtube

Here's an interesting construction. The plans look similar to the Russian book copy Don Laird sent me years ago. I suggested he try methanol. He wrote me back "The thickness of the valves did not fit, I ordered another material."
https://youtu.be/YuMnuJGBYUg
by Mark
Fri Oct 02, 2020 2:46 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1773
Views: 427071

Re: Odds and ends

I noticed this 2 liter size is listed for $210.00 and probably shipping costs. Being curious I decided to try that shape having found 4 of them (same Kimble 28040 flask) for sale for $34.00 each or best offer on eBay, new old stock so I bought one along with free shipping. The square flask is 5 X 5 ...
by Mark
Wed Sep 30, 2020 9:21 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1773
Views: 427071

Re: Odds and ends

I ordered this used ebay cylindrical volumetric flask thinking it might be a piece of laboratory glassware that would be ideal for demonstrating the jam jar jet effect, with the enhanced effect of a snorkel increasing thrust and sound all without modification hopefully. It's curious to wonder if it ...
by Mark
Sat Jul 25, 2020 4:25 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1773
Views: 427071

Re: Odds and ends

So these rechargeable flameless arc lighters are kind of unique for lighting jam jar jets. The first ones made an awful high pitched hum but now they are all but silent. If you don't like flicking flint or clicking piezos which eventually takes a few tries when the lighter is old or the bother of bu...
by Mark
Sat Feb 29, 2020 1:56 am
Forum: Off topic forum
Topic: youtube
Replies: 1465
Views: 260478

Re: youtube

by Mark
Tue Feb 11, 2020 8:08 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1773
Views: 427071

Re: Odds and ends

I ordered one of these that change color for a jam jar jet effect, which looks like a cherry blossom coming to life. Maybe I'll make the methanol burn green with boric acid to contrast the pink or lithium chloride for a brighter red. Wonder if the higher heat will bring out any more color or not? ww...
by Mark
Fri Jan 31, 2020 2:04 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1773
Views: 427071

Re: Odds and ends

I was going to try to have quirky quartz shape made but ran into a delay. Hi Friend, Sorry but we are now on Chinese Spring Festival holiday and we China are fighting the novel coronavirus in the meanwhile. So our manufacturer will have a long holiday till after Feb 10. Could you send us a ebay mess...
by Mark
Sun Jan 26, 2020 5:37 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1773
Views: 427071

Re: Odds and ends

It might have been funny to try one of these limited edition bottles that looks like it has already fractured. "Absolut's new limited edition is made of recycled glass and gives the impression of a crushed bottle. This design creates awareness and encourages people to change. Absolut shows that we c...
by Mark
Sun Jan 26, 2020 1:08 am
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1773
Views: 427071

Re: Odds and ends

600,000 liters produced per day. 13 million bottles in the storage room. That's a lot of Absolut jam jar jets.
https://youtu.be/KS8auzQ-15E?t=296
https://youtu.be/TMPLmYnSut8?t=165
https://www.youtube.com/watch?v=OUsha3uFPAA
by Mark
Sun Jan 19, 2020 2:42 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1773
Views: 427071

Re: Odds and ends

Speaking of coherent flame fronts from the last post, there was this Coleman heater I took apart in the early days to use the fuel tank as a possible jam jar. It has a pancake shape with about a 1 inch hole in the center which when lit would flutter if fueled with methanol but was unstable and would...
by Mark
Sun Jan 19, 2020 12:37 am
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1773
Views: 427071

Re: Odds and ends

Soda Water Bottle Jam Jar Jet https://www.youtube.com/watch?v=md1rdl2auWI The El Dorado rum bottle is proving extremely hard to solve. the neck widens and narrows and bottles that are not cylindrical don't seem to channel the flame as much as a typical bottle. It might as well be a sphere which I di...
by Mark
Mon Jan 13, 2020 8:36 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1773
Views: 427071

Re: Odds and ends

The first time this ran the exhaust tube shifted during the run and it stopped after only 5 seconds or so. But it was nice to see an ordinary wine bottle can become a jam jar jet too. Here's an old post from 2013 when I first thought about it. In the video review the lid is said to look like a Smuck...
by Mark
Wed Jan 08, 2020 7:35 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1773
Views: 427071

Re: Odds and ends

A plastic water bottle look for something different. The decibel level was 112 according to the sound meter I bought.

Jesting Jam Jar Jet
https://www.youtube.com/watch?v=hsfdBz1QtBA