Propeller Design

All ships have individual needs. Speed is important for some ships. Towing pull is more important for others. To satisfy these needs Finnøy use the most suitable software together with Finnøy’s knowledge when designing propeller blades. The propeller blade is designed for best possible performance regarding thrust, efficiency, noise and vibration. The blades are ground and balanced according to ISO 484 standards.

 

Nozzle

With ships that need maximum towing thrust a nozzle could be fitted. The nozzle increases the bollard pulls by approx 30%-40% over an open propeller absorbing the same power. It can be delivered as a steering or fixed nozzle.



An example of propeller thrust for a nozzled propeller compared to an open propeller in the speed range 0–12 knots.

 
An example of a nozzled propeller which is designed for high thrust, minimum noise and vibration. Moderate skew design with a blade area Ae/A0 = 0,70
An example of an open propeller which is designed for speed, high efficiency and low noise. High skew design with a blade area Ae/A0 = 0,50
An example of an open feathering propeller for a double ended ferry. Good maneuverability, minimum resistance in sailing position. Moderate skew design with a blade area Ae/A0 = 0,55
Finnøy Gear & Propeller AS • Finnøy, N-6487 Harøy • E-mail: post@finnoygear.no • Phone: +47 71 27 60 00 • Fax: +47 71 27 60 35