One-Blade Propellers (Everel, et al.)

Goal

Provide a compact, efficient aircraft propeller with higher efficiency, reduced bending and gyroscopic stress, and lower vibration.

Problem

Imbalance forces, vibrations, and structural stress in conventional multi-blade propellers; need for a retractable, lightweight propulsion unit for motorized gliders.

Concept Summary

A single-blade propeller paired with a diametrically opposite counterweight whose centre of gravity is axially offset. The offset (and optional pivots) creates a balancing moment that compensates centrifugal and traction forces, allowing automatic vibration reduction and efficient thrust.

Principles

• Counterweight balancing
• Axial offset of counterweight
• Centrifugal force based moment compensation
• Dynamic pivot allowing blade oscillation
• Variable pitch adjustment

Scientific Domains

Mechanisms of Action

• Centrifugal force on blade and counterweight generates a balancing moment
• Axial offset of counterweight adjusts the moment to match traction force variations
• Pivot mechanisms let the blade oscillate, changing the axial offset dynamically
• Variable pitch changes thrust without altering motor speed

Energy Sources

Applications

• Powered gliders
• Light aircraft
• Unmanned aerial vehicles (drones)

Claimed Performance

Higher efficiency, smoother operation, reduced bending and gyroscopic stress compared with conventional multi-blade propellers.

Limitations

• Requires precise counterweight balancing
• Complex pivot mechanisms may increase maintenance
• Effectiveness may be limited to low-power applications

Keywords

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