Thrust Vector Control of Propeller Driven Craft

A new thrust vector control method for propeller-driven aircraft has been developed that significantly reduces the cost and complexity of traditional thrust vectoring systems. Thrust Vectoring Propulsors (TVP) enable the drive-axis to remain fixed with respect to the vehicle, while only the propeller pivots through its center of thrust, eliminating adverse control moments, and reducing gyroscopic effects. The system uses a propeller hub that receives drive torque through a constant velocity joint, supported by a strut assembly that enables tilt rates suitable for aircraft stability and control, with minimal control loads. Testing of multiple propulsors generating between 100-220 lbs (45-100 kg) thrust has demonstrated tilt rates of +/-20° in 0.15 seconds with a maximum control moment of 0.94 ft-lbs (1.3 Nm). Control loads do not vary with rotational velocity or thrust, only with tilt rate. When applied to multicopter aerial vehicles, TVP provides five degree-of-freedom control by decoupling translation from attitude, improving maneuverability and efficiency. A dual-propulsor architecture utilizing this technology has been developed using a single engine for payloads from 200-600 lbs (91-272 kg). TVP has the potential to enable new aerial robotics applications with enhanced agility and control authority at significantly lower cost and complexity than existing thrust vectoring methods.