Search found 10727 matches

by Mark
Sun Nov 05, 2017 3:16 am
Forum: Off topic forum
Topic: youtube
Replies: 1449
Views: 145220

Re: youtube

How Heat-Resistant (Borosilicate) Glassware Is Manufactured
https://www.youtube.com/watch?v=PWdvQIBAzhk
by Mark
Fri Nov 03, 2017 12:59 pm
Forum: Off topic forum
Topic: youtube
Replies: 1449
Views: 145220

Re: youtube

I want to make a big putt-putt boat. have a meet and do races or something Tidbits from 2005 - Just old stuff "You can also use a single piece of copper tubing with one end pinched closed. This might be thought of as a "half" of a typical putt putt engine. A fellow I conversed with was using such a...
by Mark
Fri Nov 03, 2017 12:55 am
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1715
Views: 264417

Re: Odds and ends

Just some odd shapes that probably wouldn't jam as is but it's tempting to think about making something heart-shaped or looping that would. http://2.bp.blogspot.com/_dfjCCzJFU9s/SOM5F5jFyoI/AAAAAAAABHs/mCvZF2bOx8M/s1600-h/VerreMeneauRed6.jpg http://grandcoeurbigheart.blogspot.com/ http://the-strange...
by Mark
Wed Nov 01, 2017 2:26 pm
Forum: Off topic forum
Topic: youtube
Replies: 1449
Views: 145220

Re: youtube

Putt-putt boats would be more auditory friendly.
by Mark
Wed Nov 01, 2017 1:40 am
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1715
Views: 264417

Re: Odds and ends

The past couple of weeks I've ordered some small borosilicate vials and containers. Maybe for some jam jar jet applications they would hold up fine or for more than one trial. After all we've seen ordinary jam jars occasionally last about a minute and borosilicate has even better thermal properties....
by Mark
Wed Nov 01, 2017 1:10 am
Forum: Off topic forum
Topic: youtube
Replies: 1449
Views: 145220

Re: youtube

"It is a compact, pulse jet using a drug bottle. A hole of 6 mm is drilled in the lid of the bottle."
Bottle pulse jet
https://www.youtube.com/watch?v=RD9tMbgvfn8

Not a bad demo
https://www.youtube.com/watch?v=JkWpQRS3vkY

Glass tube putt-putt boat.
https://www.youtube.com/watch?v=JokZp3zXhEU#t=1m17s
by Mark
Wed Nov 01, 2017 12:46 am
Forum: Off topic forum
Topic: youtube
Replies: 1449
Views: 145220

Re: youtube

A pulse jet with a jam jar jet exhaust port
自作小型パルスジェットエンジンで風車回し2 pulse jet engine
https://www.youtube.com/watch?v=rnqfKCuFrss
https://www.youtube.com/watch?v=sBaAxmueDLM

Jam jar jet boat
https://www.youtube.com/watch?v=MKMab6pJwas
by Mark
Mon Oct 30, 2017 1:02 am
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1715
Views: 264417

Re: Odds and ends

Glass is fun stuff. I'm not really into hassling with it and prefer to have stuff made or cut for me. With my 12 inch diamond saw I once got a grainy particle of glass in my eye. From then on I wear goggles. Also a fragment/chip/sliver somehow cut a tiny slice in the tip of my big toe wearing Birken...
by Mark
Fri Oct 27, 2017 2:46 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1715
Views: 264417

Re: Odds and ends

I pointed out that the hole should be round and not irregular, you know how irregular holes in jam jar lids don't often work as well especially on smaller forms. I bought a few of their quartz nails as they're called and the holes where the sections connect are choked down and irregular. I can see o...
by Mark
Thu Oct 26, 2017 10:07 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1715
Views: 264417

Re: Odds and ends

Well the second manufacturer sent me some promising news but then they said they couldn't make the hole properly or maybe they wanted a large order it's hard to figure so I went back to Elaine, but here's some of the second manufacturer's offer before they had problems with the hole. Even Elaine's c...
by Mark
Thu Oct 26, 2017 7:32 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1715
Views: 264417

Re: Odds and ends

Thanks, it was a long time coming Simon. Decided to make a smaller ~20 ml one too but haven't sent payment yet, just clarifying the link I can send payment to. It might be a woman's hand in the glove making the vial/jar seem slightly larger. Now to make the quartz do something besides static running.
by Mark
Tue Oct 24, 2017 1:48 am
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1715
Views: 264417

Re: Odds and ends

I had a little finger pump sprayer test tube with some boric acid in the methanol and although I misted in a few squirts before adding in straight methanol, the bright green color only lasted intensely for the initial flash of light, had more been used perhaps a better result - the glass so thick I ...
by Mark
Tue Oct 24, 2017 12:24 am
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1715
Views: 264417

Re: Odds and ends

I was rereading this 1976 Naval Postgraduate Thesis by Robert Crow entitled Pulsating Combustion Device Miniaturization and he talks quite a bit about the Reynst Pot. "One of the most interesting of the system oscillations is the Reynst pot phenomenon. The discovery of this phenomenon was the result...
by Mark
Mon Oct 23, 2017 6:31 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1715
Views: 264417

Re: Odds and ends

So a few things that came to mind in this first run of the quartz jar. In a previous test with a thick aluminum cap on a roughly similar size quartz jar it ran for a little over a minute. Perhaps the the very thick aluminum cap wicked away more of the heat than this jar and the aluminum capped jar w...
by Mark
Mon Oct 23, 2017 2:14 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1715
Views: 264417

Re: Odds and ends

Jam jar jets now available on eBay. ha Looks like they raised the price 5 dollars from what I paid and made 3 extra. I haven't even tested mine yet so caveat emptor, not that there would be a groundswell or surge on the market at this point. https://www.ebay.com/itm/fused-quartz-tube-with-flat-botto...