Army heli-Weeble hops to avoid rubble trouble - tech - 18 September 2009 - New Scientist - 0 views
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is a rotor-powered, bottom-heavy, self-righting vehicle that spends most of its time on the ground, thus conserving battery power. Instead of flying around, it hops, using a pair of contra-rotating rotors (to avoid the need for a tail rotor) mounted on an aluminium base. All this is encased in a spherical cage made of strong carbon-fibre spars (see diagram).