David Smith has built the smallest train I have ever seen. The Claim that it is the worlds smallest is probably true. Watch the video to see a good description of how the drive mechanism works. It is truly out of the box thinking.

"After carefully inserting the train-shaped tubing into its oval slot, I bonded the layout to a styrene support block that was in turn bonded to a mounting plate attached to the motor. This was an iterative process that involved fitting and sanding and fitting and sanding until the support block was exactly the right height. The mounting plate was made relatively large to provide a convenient means of attaching the mechanism to the layout under the building."

This 5kV Induction Gun can shoot aluminum rings with some intense force. I have seen flying ring toys before which fly nice and straight. I wonder if the ring design is better than the typical bullet shaped projectiles we see on most of these guns.

"First portable induction accelerator in Russia. Capacitor energy 500j 5kV voltage, ring speed about 200m/s "

This Open Source Sentry Gun project is not as advanced as some of the Sentry Gun Projects that we have seen but it is something that can be built on and has the ability to become a robust platform. If this is something that you would like to contribute to why not contact the author and see how you can help.

Thanks Diederick

"What can you attach to your sentry as a dispenser? Anything that can attain its target in a straight line is better than anything that has a parabolic trajectory, this since the software doesn’t take distance and therefore trajectory into account. In addition that you will need a mother of a targeting algorithm in order to make this work you will also need to factor in distance and other environmental factors in order to attain your target, so slingshots, catapults or trebuchets are out. "

If you like guitar hero and are into sports then you need to have a look at this Kasabian Football Hero project!

Via: Engadget

"An experiment to create a giant (three stories high!) guitar game controlled with footballs. Football Hero is played by a team of insanely gifted young freestyle footballers. The game is programmed with the Kasabian track Underdog."

If you have a need for a DIY 30KV power supply have a look at this one that Daniel Eindhoven from megavolts.nl has built! You may have to scrounge for the parts for a few years though since it took 30 microwaves to get the needed parts. If you are thinking that you remember the name you are right, Daniel is also the one who brought us the MV CoilMaster Mark1 Coil Gun.

Bob Davis has made another can crusher with a huge 5 thousand volt power supply eBay score. A 100uF capacitor doesn’t sound that big, heck I have ones that are 10 times that size in a tray right beside me as I type this. Well the big difference is the one that is beside me has a voltage rating of 50 volts. That is a far cry from the 5000 volt rating that the one in this power supply! We have featured a bunch of Bob’s can crushers here in the past but I think that this is the biggest and baddest one so far!

This is a great TED Talk with Woody Norris. He is a mainly self taught inventing genius! Near the end of the video he talks about some of the cool military uses for his new directional sound device that are very interesting (and funny). He also discusses some of his ideas that have sold for millions of dollars. His interests vary more than most people, you may remember the AirScooter II Ultralight Helicopter that we featured before, yes that is one of his ideas also!

"Woody’s electronics knowledge is mainly self-taught, consisting of repairing broken radios he begged from the local repair shop on the way home from school. "I had a chicken coop full of 20 or 30 or 50 radios… I fixed most of them." He had a mere six months of basic electronics training in the Air Force, where he worked with radar and electronics used to trigger A and H bombs."