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Re: 399's ramp release.
Well, basically we found out you could use lexan as a springing mechanism, if you bend it, it'll snap back into shape. We connected the lexan to one part of the ramp, and bent the other part down (it's hinged). then we stuck a pin in the bottom of the ramp... there's a lot of force on that pin, from one piece of lexan (we just cut some small strips). In the video there were two pieces... Pull the pin, then the lexan snaps back into a strip, forcing it to unhinge.
Sorry for the rough explanation, it's kind of hard to explain. Just go get a piece of lexan, bend it, then release one end and watch it snap back. You can use it like a leaf spring, works great.
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