Recent content by rootLocus

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    Foam Insulation for High Altitude Balloons

    The instrument package. I'm seeing this pink colored/water resistant foam for many of these projects, but none of them specify the materials.
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    Foam Insulation for High Altitude Balloons

    Hi, I was wondering if anyone here has any good suggestions for foam insulation for high altitude balloons. We're looking at temperatures as low as -60 deg. Any recommendations on supplier as well?
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    How Can a 12-Year-Old Reverse Motor Polarities Using a Phototransistor Switch?

    A possible solution is using a L293D. It's pretty much an H-bridge in an IC. You can checkout these links to get examples and wiring solutions. http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1262265918 http://www.wiring.org.co/learning/topics/steppermotor.html http://segwii.com/hardware.html
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    Science Fair Project: High School Railgun Q&A

    I know your going for a rail gun, but consider other possibilities as well. A rail gun does require a lot of current, as mentioned above, but is doable. A really cool project that get's people excited is the Jumping Ring which is really the Lenz Effect. It's not to difficult to explain to...