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Joined: Tue Oct 16 2007, 02:01AM
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Not sure if its a new idea, but i was thinking about a way to measure velocity after coming back from the science fair (which by the way, the prize money was just enough to break even with the railgun cost, with a net gain of around 2$ =p).
When the microphone is running, and the input shorted, it gives a up ward spike. When the input is disconnected, it gives a negative spike. Now what if i have rails in front of the powered rails (insulated) that connect to microphone port. When the projectile enters, it shorts, giving a upward spike. When it leaves, it gives the downward spike. Using the time between those spikes, the length of the rails, and the length of the projectile, I should be able to find speed.
getting a good connection will be very hard, you will get a lot of bounce, and it will slow the projectile i imagine. Just use light gates, much easier.
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new railgun chrnograph idea
