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Re: Weight
Our weight budgeting always seems to start something like this:
battery: 12 lbs
electronics / wiring: 10 lbs
chassis: 10 lbs
gearboxes/drivetrain: 100 lbs
remaining functionality: -2 lbs
I probably see it that way because I'm always in charge of remaining functionality, and it never seems like enough. I think 130 pounds is a good, aggressive weight limit, but truthfully we'll work to whatever the requirement is (higher or lower) and budget according to what's most important. We feel our drive train is the most important so we make it robust, but we have to make choices - is having two speeds worth not picking up a widget in this game?
Weights and cost work this way: start with a top down budget to all the components from the requirement (with margin) to see where you need to be, then do a bottoms up detail roll-up early on to make sure you can get there. We use goals and requirements - requirements add up to 130 and goals usually about 110. Update it frequently to make sure you're on track.
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Close enough to taste it, too far to reach it
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