Quote:
Originally Posted by Vikesrock
And yet Dave has stated that he has gone down the length of the field and back in 12 seconds. This would appear to be pretty solid evidence that the published coefficients are not correct and you should try to perform a test to determine the actual CoF to get the correct maximum acceleration.
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I've laid out the steps we used
here. When we did those calculations we assumed that the entire 36 pound weight of the trailer would be borne by the trailer wheels, which is not an entirely correct assumption, some of the trailer mass will contribute to normal force on the robot and thus improve traction a bit, but even if you run the numbers for just the robot (no trailer), it seems that FIRST has published a (I've been waiting to use this.... sorry)... coefficient of fiction.
Jason
<Edit>
re-running the numbers without the trailer, or with 100% of the trailer weight on the tongue and contributing to the normal force of the robot, is should still take at least seven seconds each way... unless there is some great bouncy rebound off the end driver station wall. These calculations are also based on 100% regolith travel... Dave may have been using the carpet at the edge of the field to get up to speed. Perhaps we have been underestimating the influence that the carpeted boundary will have on the game. </Edit>