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Re: VEX Pro Ball Shifter Ratios
The main problem with running 16-17 FPS is that you have a hard time getting a full weight robot up to that speed with only 2 CIMs per side. 254 was geared around 18 FPS in 2011, but they only weighed 100 lbs. Going that speed with a full weight robot and only 2 CIMs drains batteries quickly and has a slow rate of acceleration. Plus unless you have really nicely trained drivers, 17 FPS is fast, almost to the point of uncontrollably fast. So 16-17 FPS might look good on paper, but you have to take into consideration the amount of torque it takes to get to that speed, and how easily you can control that speed. That is why most teams for a fast speed gear for 13-14 FPS, and then low gear matches up nicely with the VexPro shifters.
EDIT: Have a look at this paper and it should explain a few things
http://www.chiefdelphi.com/media/papers/2750
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All statements made are my own and not the feelings of any of my affiliated teams.
Teams 1510 and 2898 - Student 2010-2012
Team 4488 - Mentor 2013-2016
Co-developer of RobotDotNet, a .NET port of the WPILib.
Last edited by Thad House : 20-02-2013 at 12:51.
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This year should be an unusual object game. You know what an unusual object is? Water. - TheBoulderite [more] 
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