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Unread 10-01-2008, 11:56
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Making the impossibe... possible
AKA: Andrew Lane
FRC #1727 (Dulaney robotics)
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Join Date: Jan 2007
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Re: Springs?? (10 lbs. at 22 ft/s)

I honestly think that 22 ft/s is way too fast. They limited AIM high balls to 10m/s which is 32 ft/s. That is for 6 inch poof ball of 3 ounces or so and the game was designed to shoot the ball. We are hurdling the ball. 2/3 of the speed for a ball that is 40 times the mass and about 7x the size. In addition, you cannot even begin to pull that back. The springs that could do that are car springs which are compressed by 500 pounds of force for a light car. The 2 inch cylinders can provide at absolute maximum 189 pounds ( and that's not for compression!). You'd need 3 2 inch bore cylinders to do so. Even if you pull it back like this... they your not going to have enough air to do so. 189 pounds is at 60 PSI and your psi would significantly drop because the amount of air you would need.