Last year we did a kiwi drive. In order to understand the MATH behind the drive system, we did some research first, and found this whitepaper.
http://www.frcsoft.com/forums/index....ads&showcat=29
Hopefully, you'll see some value to this as well as we did. We also upload and share all of our robot code on frcsoft.com as well.
Good luck this season.
Chris