Figure 4-2: BUMPER Corner Examples shows a diagram of a frame with bumpers only on the corners. I interpreted it as just demonstrating how you may position bumpers so that they are flush with each other on the corners. One of the mentors has interpreted it as we may have a bumper gap with nothing protecting the frame...as long as we have at least 8 inches of bumper on the corners.
Thoughts? He wants to have the gap on one side of the bot so that it isn't as heavy as it would be with a full bumper. I've never seen a robot with gaps.
Suggesting change is one thing, implementing it is another. - JaneYoung [more] 
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