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Originally Posted by Al Skierkiewicz
I can tell you that if you went to NASA with two attachments to be put on a spacecraft and tried to make the argument that they meet weight with a motor installed in only one, you, at best, would be laughed at. You know that both motors need to be installed for that device to fly and the weight limit is there to get it off the ground. All those inventors, scientists and engineers came up with real solutions to real world problems and did not try to bend the rules to achieve them. The rule is clear and specifies only one battery and does not include spares.
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Originally Posted by Natchez
Since only one mechanism is on Redabot at a time
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Al, I don't think the analogy quite captures the problem--as you've phrased it, doesn't it lend itself better to a scenario wherein the total weight of the
as-launched vehicle is less than the limit? (That is to say, like 2003.) After all, NASA would itself be laughed at if it thought its vehicle overweight for apparatus that would not be flying with the vehicle on this trip, and which couldn't have been attached in combination with the attachment being used. In short, no, both motors do not have to be attached for the device to fly (or the robot to run), because there exists no configuration that uses both motors simultaneously--there's no place to fit it in.