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Re: Surgical tubing issues
I wouldn't say that your surgical tubing isn't losing power but more on the side that you're having the tube elongated out of its clamp. This would decrease winch elongation and therefor the force to shoot. What you might want to look into doing for your surgical tubing is clamp it using a capstan. It essentially uses the friction around a corner, cylinder, or any surface to relate to clamping force.
Here's the wikipedia page about it all!
http://en.wikipedia.org/wiki/Capstan_equation
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FRC 973: Greybots - 2011 - 20XX
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