Search found 10753 matches

by Mark
Sun Jan 20, 2019 3:25 pm
Forum: Off topic forum
Topic: youtube
Replies: 1456
Views: 170245

Re: youtube

Some creative designs in putt putt boats, although kind of a sad back story.
https://youtube.com/watch?v=1yYVHfbxK9g
by Mark
Mon Jan 14, 2019 6:00 pm
Forum: Off topic forum
Topic: youtube
Replies: 1456
Views: 170245

Re: youtube

Someone made a pulsejet out of a reed, like one of the ones I have but never got around to using, pictured next to my red Dyna-jet head here.

download/file.php?id=14630&mode=view

Valved pulsejet
https://youtube.com/watch?v=B2DEpeDj2t8
by Mark
Thu Dec 20, 2018 2:40 pm
Forum: Off topic forum
Topic: Nature's Children
Replies: 697
Views: 175376

Re: Nature's Children

Even babies can startle you.
Electric Eel babies
https://youtube.com/watch?v=C4D2xFI5RPA
by Mark
Tue Oct 16, 2018 3:27 pm
Forum: Off topic forum
Topic: Left field
Replies: 599
Views: 83148

Re: Left field

This fellow even created nostalgic model toy kits to go along with the pretense. Seems like something Larry C. would have liked, he was into retro stuff I recall. Definitely a surreal left field endeavor - Project Wool Over Your Eyes. The ammo box with the RAYOVAC battery and accessories hurts my he...
by Mark
Sat Oct 06, 2018 12:22 am
Forum: Off topic forum
Topic: youtube
Replies: 1456
Views: 170245

Re: youtube

Thermoacoustic Heat Engine from Syringe. Part 2 (generator)
https://youtube.com/watch?v=rh78vsyGwXI
by Mark
Thu Oct 04, 2018 1:11 am
Forum: Off topic forum
Topic: Nature's Children
Replies: 697
Views: 175376

Re: Nature's Children

Starting around the 5 minute mark the video becomes quite worrisome and horrifying off the coast of Australia.
Drowning in Plastic
https://www.dailymotion.com/video/x6uk7h5
by Mark
Tue Sep 25, 2018 5:15 pm
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 379
Views: 109039

Re: Mike's Build Log

That looks like a nice pickle slicer. I looked for various steel/heat resistant impellors to spin up but never found anything suitable or low cost.. But the jet ski prop idea seems like something fun to try. Is that a skateboard wheel on the end of the shaft? As an aside, I bought a few sets of whee...
by Mark
Tue Sep 18, 2018 2:34 am
Forum: Off topic forum
Topic: youtube
Replies: 1456
Views: 170245

Re: youtube

Here's a curious fire tornado vs fire hose. Somehow in an abstract way I imagined a jam jar jet effect without the jar, the fuel cellulose instead of methanol and a chimney feedback effect without the chimney. Although the flow is more of a steady state, the center fire vortex might have resonate pr...
by Mark
Fri Aug 31, 2018 2:36 pm
Forum: Off topic forum
Topic: Nature's Children
Replies: 697
Views: 175376

Re: Nature's Children

"To my horror, in about 30, 40 minutes, all the lobsters were killed." (1000 lobsters!) Video narration at the bottom of the article.
When Snails Attack
http://blogs.discovermagazine.com/scien ... 4jQqahOk1K
by Mark
Thu Aug 30, 2018 8:19 pm
Forum: Tools and Construction
Topic: Quartz
Replies: 42
Views: 17075

Re: Quartz

This might be something to employ if you wanted a region of a quartz tube to be conductive. I like the mirror-like finish. Graphite will take a lot of heat, although it might slowly react/burn up eventually if red hot in an oxygen atmosphere. Coating Quartz Glass Tube In Graphite https://youtube.com...
by Mark
Tue Aug 28, 2018 1:59 pm
Forum: Tools and Construction
Topic: Quartz
Replies: 42
Views: 17075

Re: Quartz

Have you an idea of how to hold the quartz with something soft yet high temperature? A metal clamp with some sort of gasket material?
by Mark
Mon Aug 27, 2018 5:18 pm
Forum: Tools and Construction
Topic: Quartz
Replies: 42
Views: 17075

Re: Quartz

That sounds great. Flexible saw blades tend to walk if not guided, from my experience. If you had a stencil source, there's that low cost, easy to use etching creme that might be fun to embellish a section of the glass tubing with a salamander/symbol of fire or other creatures or lettering. Also a s...
by Mark
Sun Aug 26, 2018 5:59 pm
Forum: Tools and Construction
Topic: Quartz
Replies: 42
Views: 17075

Re: Quartz

This seems easy enough but still you'd have to sand it. I like the fine wire cutting approach because the chipping at the end of the cut would probably be minor. But the tiny wire is probably fragile/snaps easily being so thin and might wear out after not that many cuts although it's inexpensive. ht...
by Mark
Sat Aug 25, 2018 2:06 pm
Forum: Tools and Construction
Topic: Quartz
Replies: 42
Views: 17075

Re: Quartz

I just ordered a meter of "diamond wire saw" for $1.92 off eBay just to see how it does. You could cut fine gill slits or other patterns in the tubing. Also there's this diamond bandsaw blade if you could construct something to hold or drive it. Maybe even cut the tubing under water. New MD37718 Rep...
by Mark
Sat Aug 25, 2018 12:28 pm
Forum: Tools and Construction
Topic: Quartz
Replies: 42
Views: 17075

Re: Quartz

Some parameters GLASS AND THE SPACE ORBITER "Fused silica glass consists of a single oxide. This glass consists simply of silica (silicon dioxide) in the noncrystalline or amorphous state. Adding anything to it puts it in another category. Fused silica is the most expensive of all glasses and shows ...