Variable Pitch Propeller

Low Noise Propeller Design and Construction for Unmanned Aerial Vehicles

NWUAV's exclusive Propriety Aerodynamic Design produces Low Noise Propellers for unmanned aerial vehicles.

NWUAV utilizes propriety code developed for racing airplanes to improve maximum speed and efficiency. Performance efficiency and acoustical signature are the driving metrics for this low-noise propeller design. They are traditionally optimized separately but somewhat concurrently through proprietary software. These are then prototyped and tested to steer multiple rounds of design for performance and then acoustic optimization. Final test articles are then manufactured for testing in both static and dynamic conditions.

2-Blade and 4-Blade NWUAV Low Noise Propellers

The performance of a UAV propeller is determined by its geometry, which consists primarily of the:

  • Number of blades
  • The diameter
  • Hub diameter
  • The airfoil shape/distribution
  • Chord
  • Pitch distribution
  • Coning angle

Aerodynamic Design

The NWUAV propeller design is a unique solution to an elliptical lift distribution along the blade span, making efficient use of the entire span. The thrust generated tapers off to virtually none at the tip, greatly decreasing energy losses and increasing the conversion of input energy to thrust overall.

The unique shape that achieves this performance gain also serves to lower the acoustic signature. It is hypothesized that the swept segments of the trailing edge distribute the phases of the thickness and loading contributions of the span wise elements, reducing the amplitudes of the tones.

With the specific design criteria and operating conditions defined, during the first design iteration the propeller geometry is tailored and optimized for the best aerodynamic and structural characteristics.  The second design iteration considers the manufacturability of the aerodynamic design using the appropriate production techniques. The final propeller is the best solution for the combination of aerodynamic performance and efficient manufacturability.

NWUAV Propriety Low Noise Prop Design CAD Drawing

NWUAV Propriety Low Noise Prop Design

Variable Pitch Propeller with Low Noise Blades
2-Blade NWUAV Low Noise Propeller