Underactuated Rotor For Simple Micro Air Vehicles
From MODLAB (The modular robotics laboratory at the University of Pennsylvania):
We derive thrust, roll, and pitch authority from a single propeller and single motor through an underactuated mechanism embedded in the rotor itself. This allows new types of conventionally-capable micro air vehicles which only require two motors for practical control. This contrasts with the many servos and linkages of conventional helicopters or the many drive motors found in quadrotors... (cont'd)
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