An Economic Propeller Choice for Narrowboats

The Vetus three-bladed manganese bronze propeller offers excellent value and reliable performance. Although it measures a relatively large 19” in diameter with a 14” pitch, the high-torque Törkmar motor handles it effortlessly. Consequently, this propeller provides a robust, cost-effective solution for your vessel.

Understanding Propeller Specifications

The specific design of this propeller ensures efficient operation at canal speeds. By balancing surface area and fit, it delivers a dependable cruising experience:

• Optimised Disk Area Ratio ($Fa/F = 0.52$): This ratio indicates a lower blade surface area. As a result, the propeller reduces strain on the motor while maintaining excellent efficiency on inland waterways.
• Standard 1:10 Taper: The hub features a universal 1:10 taper to ensure a precise, secure fit.¹ Specifically, the diameter decreases by 1mm for every 10mm of length.
• Manganese Bronze Construction: Furthermore, this durable material guarantees a long-lasting finish and represents a smart investment for the price.

Shaft Recommendation

To manage the significant torque and thrust, we recommend a 35mm shaft for this propeller. This increased diameter provides the necessary strength to prevent bending or excessive vibration. Thus, pairing this propeller with a sturdy shaft creates a reliable propulsion system that enhances the performance of your Törkmar motor.