1 - This is NOT an easy origami. So don't expect to make it as easily as the other origami airplanes. But for intermediate origami folders this origami should be really easy.

2 - This airplane doesnt fly. It's just a model.

3 - This is my own design, I did create on june/2012.

How to make an F15 Jet fighter paper plane using a printer paper (A4).

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Project inspired by: This is an original design, based off a picture I once found on a google image search. (I haven't been able to find the picture since)

WARNING: Power tools, like a table saw, pose risks of serious injury. Adequate training and experience are required before operating. The results and claims of this pump are based solely on my personal experiences with the one demonstrated in the video. Individual results may vary. The pump is a simple design and not made, or claimed, to be used in any heavy duty operations, or relatively high pressures. Use of this content is at your own risk.

I've wanted to build a PVC water pump for awhile, but the check valves were around $10.00 each. That seemed a little steep for a PVC build, so I made my own, which you can see in a different project.

I was inspired on the pump piston and chamber by a picture I saw on a google image search by someone who used the 1-1/4" and 1" sizes of tubes, and he mentioned he cut the grooves for the O-rings on a table saw. That was a new idea to me and gave me the inspiration to put this together.

I'm also planning to use this piston design in future projects that require pneumatic and hydraulic pistons.

In my testing, the valves work great with air and water. I didn't have any gauges to test the strength of the vacuum so can't say how strong the vacuum would be, but it certainly does create one.

While there are some special tools used to create this pump (table saw and forester bit), I believe with a little creativity the pump could be made just as effectively without them, making this a simple and duplicatable design.

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This circuit makes a hidden emergency HDD to be controllable only by your key, regardless of how many people use the same computer.

This HDD should be used only for Copy and paste, because of low power of relay batteries, if you want it to work longer, add more batteries using parallel connection. Or use a stronger RC Circuit.
This is an electronic Hack to protect the data from Software Hackers,or some-one you don't want him to access your data.

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How to Make an Airsoft Machine Gun from a Soda Bottle 

 

This is a follow up video to my airsoft minigun project that was posted in 2011. This version of a cloud BBMG is less expensive and much easier to build. This model is also well suited for a backpack mounted air chamber to make it into a flamethrower design. I plan on showing that particular modification in an upcoming video. The total cost of this build is about $15.



Parts:
Soda Bottle
5/16" x 8" Automotive Brake Line
1/4" Quick Release Air Compressor Fitting
Air Compressor Blow Gun

Tools:
Drill & Drill Bits
Hot Glue Gun
Air Compressor

 

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Hank shows us another SciShow: Experiment! This time he's tackling what may be the most cliche, well-known and misunderstood experiment of all time: the lemon battery. The take home message in this one is: the electricity is NOT in the lemon. Just that delicious juice.

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The drops of glass made in this video have several very interesting characteristics. On the one hand, they can survive very strong impact from the side, but when the tail is snapped off they fracture and explode like a crystal grenade. Destin of the YouTube channel Smarter every day does a great job explaining the physics in his excellent video: http://www.youtube.com/watch?v=xe-f4g...

One thing that the mentioned video did not demonstrate is how Prince Rupert Drops can be made without a commercial glass furnace. The video i have put together was made to supplement that information

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Here is a short video that I thought would be appropriate for Easter weekend. A few tips to make sure that this works right: You can hold the eggs up to a light before boiling to check if they have been properly scrambled. A scrambled egg will let only a small amount of red tinted light through, a normal egg will be much brighter and have a yellow tint. Be sure that the strings or rubber bands are tightly on the sleeve or the egg will be out of balance and be impossible to spin fast enough for it to work properly. Also, the eggs are weakened by doing this and sometimes tend to pop if cooked in water at a full boil. To cook properly, place in water on the stove and heat until it's hot enough that bubbles start forming on the shells, but not at a full boil, then turn off the burner and let the eggs sit in the pot for 15 minutes. When the time's up dump the eggs in cold water to cool them quickly so they don't overcook.

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This video demonstrates how the combustion of alcohol can be used to launch water bottles very long distances with the help of a very simple launcher.

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I noticed that there was no decent tutorial out there for making a paper crossbow that didn't utilize rubber bands. This is what I came up with as a result. The crossbow is actually quite durable in design and should stand up to use for for a very long time so long as it doesn't get wet. Hopefully a good deal of office boredom can be solved with this.
The working mechanism for this crossbow is in the arms made of rolled paper and supported by tape. Typically a bent tube of rolled paper would tear when bent, but a layer of tape seems to distribute the load evenly enough to not only prevent the paper from tearing, but also give it a strong and fast spring action when released. This allows for a rigid bow string to be used which utilizes the energy in the arms to propel the projectile - Rather than most toy crossbows which use rigid arms and an elastic band which propels the bolt more like a slingshot than a crossbow.

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This crossbow can throw a pencil or pen a good 100 feet. A possible modification for even more power might be to make two arms on each side that the bow string would tie together at the tips. Having double arms is about the only way to go about adding more power because adding much more paper to the first set will only result in them tearing or being completely rigid. Similar to how you can only fold a piece of paper so many times.

Have fun! Don't take an arrow to the knee.

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