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The main landing gear is equipped with an electric motor powered by the auxiliary power unit which allows the aircraft to push back from the gate and taxi without a tug or its jet engines.[1]
The system weighs 300 kilograms (660 lb) and is permanently installed on the aircraft.
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So, the weight of 2-3 passengers. 
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Originally Posted by DDG
What does 'triple redundant closed-loop digital avionics ...
https://space.stackexchange.com/ques...cs-system-mean
The primary flight system comprises six computers, three sets of two computers each (triple redundancy X dual redundancy). This, along with massive verification and validation (V&V) was enough to satisfy NASA that the Dragon achieves the two fail safe requirement. |
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