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Unread 06-04-2012, 14:44
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JamesCH95 JamesCH95 is offline
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FRC #0095 (The Grasshoppers)
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Re: Crazy robot idea for this year 2

A perfect battery can support around 60A draw for the whole match, at around 11.5 volts. Lets be generous and say you only want a few moments of flying and the battery can support 150A at around 10.5V. This is 1575 Watts, which should be able to lift around 16-17lbs.

I do not believe that it is possible to lift all of the required hardware (battery (13lbs), cRIO (1.4-2lbs), cRIO modules, power board (1.6lbs), digital sidecar (0.25lbs), main breaker, bumpers, motors, radio (0.5lbs) etc) with the battery's available power. This is even without accounting for losses such as resistance in wiring and motor inefficiencies. In fact, that 1575W of theoretically available electrical power is probably around 1200W if you use RS775-18s at peak efficiency (78%). Voltage at the motors will be lower than 10.5V, so ding some more power...

I think it's safe to say that the battery cannot output enough power to lift the absolute minimum FRC legal robot.
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