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1. ### I was gone applying for college, now I'm in and back.

My freshman classes start Sep 20. Basically Math, English, Biology. My declared Major is Cellular Biology, on the way to that I end up with an Associates in science in the next two years. The SKC also offers EMS, Fire, and HASMAT certs that only take 2 semesters. I'm thinking HASMAT as one of...
2. ### "Hand Held" Supersonic Wind Tunnel, and you probably already own one.

Q = V*A*K Flow Rate Calc Yet once again, I will state simply, getting supersonic flow from just 60psi is reasonable... "air duster" is 75 - 100 psi... Go, test, verify, don't be lazy when you have the answer a few keystrokes away, just because you already know the answer will prove your knee...
3. ### "Hand Held" Supersonic Wind Tunnel, and you probably already own one.

A tank pressurized to 35psi (air duster is between 75 - 100 psi) has a 3 micron hole, air escapes at a rate of at least 100 cc/m (dunk and bubbles captured) indicating a gas velocity of .82 or so (with the resistance and pressure of being submerged). When you double velocity energy x4s. A gas...
4. ### "Hand Held" Supersonic Wind Tunnel, and you probably already own one.

Spot on, the method I'm using simply forgoes the mirror. I may dig out some candles or light some matches to demo using this setup. I'm using source that is more than 2 watts. I don't need the mirror to boost the light source. I can simplify the design. I would call this a Schlieren Projector...
5. ### "Hand Held" Supersonic Wind Tunnel, and you probably already own one.

It only takes about 60psi to push air to mach in the right conditions. Those conditions include air compressors and most aerosol propellant cans. The air duster can cools and the pressure drops, the can has to be room temp for this to work. It works better the warmer you get it.
6. ### "Hand Held" Supersonic Wind Tunnel, and you probably already own one.

This is pretty simple guys. If you have ever removed the optics from a laser then shined the "flashlight beam" around you are 99% of the way there. If you have notice the sharp shadows it cast and made some shadows you are 99.99% of the way there. Do you have a can of "air duster"? Possibly...
7. ### I was gone applying for college, now I'm in and back.

Well after two years procrastinating/deciding if I was sure I went ahead with it. I have at least 6 years of GI Bill, but they have gone to 8 for Veterans after Dr. Montana offers 6 more years ON TOP of the GI Bill after it runs out under the Veterans Education Benefit. My local community...
8. ### First continuous room-temperature solid-state MASER

Diamond Solid State MASER Detailed Technical Article in Nature My first thought was application in propellantless RF Cavity thrusters. Since they require very finely tuned microwaves to produce the thrust effect...
9. ### In search of 22A 4V buck driver.

PTH05020WAZ Non-Isolated PoL Module DC DC Converter 1 Output 0.8 ~ 3.6 V 22A DC12V/24V 8V~36V Step-Down to DC 5V 30A 150W Due to the size of those parts I'm thinking a 3 Cell Maglite host and FEILONG 32650s Feilong 32650 Cells TESTED!
10. ### In search of 22A 4V buck driver.

Well #### I guess I have to let the cat out of the bag... A bit. 22A at 4V as that is the "max" power recommended for the single diode I have. Yes, lots of amps, lots of sag, lots of heat, almost no runtime... The 26650s I have are rated at 35 amps/ea... For the driver "small" is entirely...
11. ### In search of 22A 4V buck driver.

I'm looking for a 22A 4V driver. (2 26650s as power source) A small driver with the ability to use an external adjustable pot (as blackbuck M8) would be great. Any designs for such a driver would also be useful.
12. ### How strong does a laser pointer have to be to burn?

Laser Safety video As for laser "Classes" I no longer buy any lasers on Ebay. No it has nothing with me having my nose in the air and wanting a laser for the upper class. Almost all lasers on Ebay/Amazon are junk *Not as powerful as ad states, poorly made, fragile, short life, plastic...
13. ### 1W Laser for Self Defense in an Active Shooter Situation

Hmmm... I could see the use of a blinding laser attached to your rifle... If your pointing the rifle at them your at the justification point to be blinding them (less lethal)... Maybe 2 mode (non perm blinding mode *strobe nausea* and screw your retinas for the rest of your life)... Laser...
14. ### any cheap 1W 445 lasers?

I would recommend this build. Using a C6 host from Survival Laser and a 20mm Module from DTR of your choice, he has a nice selection and can set the driver. DTR 2W 470nm C6 A pair of pliers and a soldering iron on two good sized forgiving spots and you have a high quality build that you did...
15. ### BUILD 638nm 900mW HL63193MG in 20mm C6 host.

Poor quality camera.
16. ### BUILD 638nm 900mW HL63193MG in 20mm C6 host.

Though the beam profile is "poor" in this 638nm, when focused to infinity, I still find it handy for a little light burning. Focused to a point it is sort of like a calligraphy pen where light pressure (lift) gives a fine point but with very little change the beam widens. I like the orange red...
17. ### BUILD 638nm 900mW HL63193MG in 20mm C6 host.

First a shout out to DTR and his 2W 470nm+ C6 20mm Overdrive Special for inspiring this build as well as the 20mm module assembly. Also kudos to Survival Laser and their fast shipping and helpful customer service. Also sorry for the low quality pics, I have yet to invest in a good...
18. ### 3d printing

Maker Select 3D Printer v2 As I understand it this is a good printer, it does many composites including metallic types, lots of support, DIY improvements and aftermarket upgrades.
19. ### Engineers Turn a Laser Beam into a Stream of Liquid

Engineers Turn a Laser Beam into a Stream of Liquid Light usually passes straight through water and so can’t generate a stream of fluid, right? Not anymore.