Search found 10827 matches

by Mark
Tue Dec 22, 2020 7:18 pm
Forum: Off topic forum
Topic: youtube
Replies: 1468
Views: 285343

Re: youtube

An enterprising/resourceful commercial design using the visual curiosity angle and the thermal properties of quartz. See-Thru Mini Engine https://youtube.com/watch?v=d06lmOFNLqM https://www.stirlingkit.com/collections/toyan-engine/products/toyan-fs-s100at-4-stroke-nitro-gasoline-general-engine-model...
by Mark
Mon Dec 21, 2020 4:05 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1776
Views: 463165

Re: Odds and ends

I had no idea there were arc lighters! Ding, The More You Know There's a bevy of interesting variations of these convenient USB rechargeable arc lighter shapes and demonstrations on youtube. They're such a compact ignition system for a pulsejet spark plug if you were to wire one up running some lea...
by Mark
Mon Dec 21, 2020 3:54 pm
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 384
Views: 184841

Re: Mike's Build Log

This little augmenter or similar shapes if held in the exhaust of the paintball snorkelers makes some kind of vortex street or cavitation that will absolutely blast your eardrums. A strange phenomenon to behold. Happy holidays too! http://www.pulse-jets.com/phpbb3/viewtopic.php?f=7&t=3210&start=1530...
by Mark
Mon Dec 21, 2020 3:36 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1776
Views: 463165

Re: Odds and ends

I saw these high temperature combustion quartz tubes and couldn't help but muse what if squirting some methanol in them, how would they rev up or not.
http://www.grand-sources.com/uploadfile ... 516911.jpg
http://en.grand-sources.com/index.php?s ... show&id=22
by Mark
Thu Dec 17, 2020 2:57 pm
Forum: Off topic forum
Topic: youtube
Replies: 1468
Views: 285343

Re: youtube

I always wondered why the water slowly rises in a bottle and then so suddenly the vacuum collapse occurs. Note the cloud just before the collapse.
Steam Hammer
https://youtube.com/watch?v=bDItSUeykrA
by Mark
Thu Dec 17, 2020 2:34 am
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 384
Views: 184841

Re: Mike's Build Log

Mike, the one with the leaky fitting is a bit fussy and the best way to fuel it is to put the least amount of fuel in it, just enough to barely cover the bottom and then screw the snorkel on as best you can and stand it upright to light it and so you don't leak fuel out the reducer by fueling it ass...
by Mark
Thu Dec 10, 2020 4:48 pm
Forum: Off topic forum
Topic: youtube
Replies: 1468
Views: 285343

Re: youtube

A hint of pulsating combustion in advertising.
https://www.ispot.tv/ad/t6iL/johnnie-wa ... thout-fire
The fire of curiosity. ..
https://www.ispot.tv/ad/tT1R/johnnie-wa ... -curiosity
by Mark
Sun Nov 08, 2020 2:27 am
Forum: Off topic forum
Topic: youtube
Replies: 1468
Views: 285343

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: 1468
Views: 285343

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: 1468
Views: 285343

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: 1776
Views: 463165

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: 1776
Views: 463165

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: 1776
Views: 463165

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: 1468
Views: 285343

Re: youtube

by Mark
Tue Feb 11, 2020 8:08 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1776
Views: 463165

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...