PSRU-Propeller Speed Reduction Unit-Gearbox (Soft Drive) 1.73

Take to the skies with Stinger Drives Soft Drive PSRU, the ultimate Propeller Speed Reduction Unit engineered for 2026 performance standards. Designed specifically for experimental aircraft, our system transforms raw engine output into precision thrust, allowing your craft to reach its peak aerodynamic potential.

The Science of Efficiency:

The Stinger PSRU is more than a gearbox--it is a performance multiplier. By reducing high-engine revolutions (RPM) to a lower, more efficient speed for the propeller, our system allows high-RPM engines to turn large-diameter propellers with ease. The optimization delivers:

• Increased Performance: Maximized thrust for shorter takeoffs and better climb rates.
• Lower Fuel Consumption: Engine operation at it ideal power band saves you money on every flight
• Reduced Noise: Lower prop tip speeds means a quieter more comfortable cockpit and smaller noise footprint.
• Improved Torque: A reduction drive increases the torque delivered to the propeller, which can improve takeoff and climb performance.

Aerospace-Grade Engineering

• Masterful Construction: Every gearbox case is cast from 356 T6 heat-treated aluminum, offer a superior strength-to-weight ratio and exceptional heat dissipation.
• Precision Helical Gears: Our large, heat-treated helical cut gears are designed for maximum durability. Through a meticulous assembly process, we set the gears at zero lash, ensuring whisper-quiet running and fluid power delivery.
• Soft Drive Advantage; Integrated vibration damping isolates your propeller from engine harmonics, significantly extending the life of your airframe and drivetrain.

Rugged Versatility

• Reliable & Durable: Proven in the most demanding environments, from high-altitude cruising to rugged bush flying.
• GM Motor Compatibility: Engineered to bolt directly up to GM Motors, providing a seamless bridge for LS and SBC conversions.

Pusher & Puller Ready: Fully optimized for both configurations, providing total flexibility for your unique airframe design.

Reliable. Durable. Revolutionary. Experience the future of flight by visiting Stinger Drives to find the perfect PSRU for your build. Elevate your aircraft's performance with the quiet strength of Stinger Drives.