Search found 10699 matches

by Mark
Wed Dec 13, 2017 3:06 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1699
Views: 245751

Re: Odds and ends

Well it may not seem like much, but I finally got the perky 1/2 inch diameter snorkel on the 12 ounce paintball tank to sustain for a full grease 5 second run. Instead of the typical 30 ml of methanol in the tank and endless attempts, something around 50 ml was used and the tank maybe held at a slig...
by Mark
Mon Dec 11, 2017 2:39 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1699
Views: 245751

Re: Odds and ends

Another thing tried was a spark plug on a beer bottle starting the propagation internally instead of at the exhaust end using a Bic lighter. And it seems to be more reliable for getting the bottle to rev up. On time, all 5 tries produced a good starting impulse with revving whereas if lit from the t...
by Mark
Sun Dec 10, 2017 12:38 am
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1699
Views: 245751

Re: Odds and ends

So another jam jar of modest results. Perhaps the fuel/air ratio is more fragile with smaller sizes as the heat builds up evaporating more fuel than it can use. Also the fuel becomes watery as it runs of course, the byproducts of combustion CO2 and H2O. 2CH3OH + 3O2 ===> 2CO2 + 4H2O Jam Jar Jet Mini...
by Mark
Fri Dec 01, 2017 4:14 pm
Forum: Off topic forum
Topic: youtube
Replies: 1436
Views: 135453

Re: youtube

Inflating Evacuation Slides https://www.youtube.com/watch?v=nM8P6TtcrFY This entraining aspect made me think of the Gluhareff pressure jet to some extent. "Slides inflate with an initial boost from a canister of compressed carbon dioxide and nitrogen. The canister provides only about one-third the v...
by Mark
Wed Nov 29, 2017 2:50 am
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1699
Views: 245751

Re: Odds and ends

Yesterday I tried an experiment with this 3/4 inch diameter exhaust snorkeler http://www.pulse-jets.com/phpbb3/download/file.php?id=14741&mode=view because of the tall faint flame I saw with the piglet snorkeler with the larger diameter 1.25 inch diameter snorkel I videod the other day. It's just ea...
by Mark
Fri Nov 24, 2017 6:18 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1699
Views: 245751

Re: Odds and ends

Some future plans are to string this Nilo filler wire I bought for some Curie point experiments across the length of the yard which gives me about 110 feet if I max out and if really crazy there is the diagonal which would provide even more length. But the aim or hope is to wire guide little beer bo...
by Mark
Fri Nov 24, 2017 5:24 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1699
Views: 245751

Re: Odds and ends

This is the failed J-bend arrangement. It may be that not only the diameter could be too large and/or the bend too sharp but also the length too long as well.
by Mark
Fri Nov 24, 2017 1:57 am
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1699
Views: 245751

Re: Odds and ends

So I got around to videoing a piglet snorkeler with the larger diameter snorkel I had mentioned in previous posts. Traditionally it ran on a 1 inch diameter intake/exhaust. To recount, one day when it wasn't much above freezing outside, the 1.25 inch configuration was really rocking big time. It's u...
by Mark
Fri Nov 17, 2017 9:36 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1699
Views: 245751

Re: Odds and ends

In other news I'm hoping to take an introductory 3 hour lampworking class and then I can rent the room by the hour by myself. Maybe if I can get some extra dark glasses instead of the didymium ones the art studio has I can do some of my quartz tubing too. I wish they had a lathe for the glass though...
by Mark
Fri Nov 17, 2017 8:46 am
Forum: Off topic forum
Topic: youtube
Replies: 1436
Views: 135453

Re: youtube

by Mark
Thu Nov 16, 2017 1:11 am
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1699
Views: 245751

Re: Odds and ends

So I bought some borosiicate bottles in the 80,100, and 150 ml sizes. They're the "diameter of 47 mm series" from China. The borosilicate glass seems to have more clarity or sparkle over ordinary soda lime glass, you notice it when holding one in your hand, but the difference is subtle. From some an...
by Mark
Mon Nov 13, 2017 7:35 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1699
Views: 245751

Re: Odds and ends

Revisiting the Gatlin gun today and after a few false starts and staccato short revs it finally stabilized for a minute after putting the proper amount of fuel in the tank. The yard hose was used to cool it between starts because if it's hot the fuel/air ratio gets thrown off even after you air it o...
by Mark
Sun Nov 12, 2017 2:08 am
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1699
Views: 245751

Re: Odds and ends

Tidbits That's 2732 degrees Fahrenheit ... "The main reason we are asked to build such items from quartz is the greatly improved thermal shock characteristics of quartz over any other type of glass. Fast acting, high heat releasing reactions that will crack Pyrex® or other glassware do not even stre...
by Mark
Wed Nov 08, 2017 6:28 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1699
Views: 245751

Re: Odds and ends

I was trying to think of something the little quartz vial could do, say to cause motion in bees or hummingbirds, a little kinetic art diorama of some sort. There's several designs of fidget spinners, they could spin up under the power of these tiny quartz jets, but nothing really enthralling has com...
by Mark
Wed Nov 08, 2017 4:39 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1699
Views: 245751

Re: Odds and ends

Here you can see some of the haze but from other angles, even more is apparent. The hole is nicely formed. The shape sort of reminds me of one of the many typical vacuum tubes you'd see in the back of an old television set or something. Quartz resonator - ha https://www.ebay.com/itm/2-X-Tube-Quartz-...