Quote:
Originally posted by Matt Reiland
I don't think 71 shifted (well thier feet shifted back and forth) and they did pretty good this year  Neither did 47, 67, 61 and many others
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Don't limit your thinking to shifting gear ratios. In my opinion 71 did shift. They could move really fast on the back wheels and had tons of pushing force with the "walkers".
We did something similar without changing any gear ratios. We had a second set of smaller wheels that turned much slower than the main drive wheels. When we latched to a goal, our fast wheels were lifted off the ground and our high torque wheels were planted into the carpet. Using wheels that spin at different speeds where you can select which of them is contacting the carpet is the easiest way to "shift on the fly". Our OCCRA students (a 100% student built robotics competition) even pulled this off last year using only a hand drill and hack saw.
http://www.chiefdelphi.com/forums/at...&postid=108949