I was kind of wondering the same thing. I found this which may help.
http://www.rccaraction.com/articles/2_speed2.asp
I know RCCA did an arcticle just about how they work and I have every issue from the last 4 years but I don't have time to look through them all. You might try sending an e-mail to them.
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Teacher/Engineer/Machinist - Team 696 Circuit Breakers, 2011 - Present
Mentor/Engineer/Machinist, Team 968 RAWC, 2007-2010
Technical Mentor, Team 696 Circuit Breakers, 2005-2007
Student Mechanical Leader and Driver, Team 696 Circuit Breakers, 2002-2004
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