Finnoy Gear & Propeller AS Gearboxes and controllable pitch propellers (CPP)

Founded in 1884 Finnøy Gear & Propeller AS is specializing in producing the reduction gearboxes and controllable pitch propellers (CPP). The company have designed and manufactured the propellers since 1902 and the gearboxes since 1976. More than 50% of Finnшy equipment is exported.


Single Stage Gearbox


The reduction gearboxes are designed for engines between 150 kW to 8000 kW. Maximum input speed is from 3200 rpm to 1000 rpm for the largest gearboxes. The reduction ratio is from 2:1 up to 10:1. The largest reduction is done by an additional gear train. The gearboxes can be delivered with PTO’s for hydraulic pumps or shaft generator.


Twin Input — Single Output


Twin input – single output gearboxes is often used when variable power to the propeller is required. The gearbox can be operated with one or two engines at the same time. In vessel were extra reliability is required this is a good solution. The engines can either be placed in front or behind the gearbox. PTO’s for hydraulic pumps or shaft generator can be delivered.


CP Propeller


The CP Propellers are manufactured from 1000 mm to 5000 mm in diameter. They are delivered with 3, 4 or 5 blades. The propeller hub and blades are manufactured in Ni.AL-bronze. They can also be delivered in Stainless steel. The hydrodynamic blade design calcula¬tions are based on detailed analysis in corn-outers together with Finn0y’s long experience. The propeller shaft is hollow bored and made Df carbon steel or stainless steel. The pitch is adjusted by the push – pull rod. It transfers :he axial force from the servo piston in the gearbox to the pitch setting mechanism in the propeller hub. The propeller hubs, type P26 to P48, are grease lubricated and from P39 to P125 are oil lubricated. The stern tube is delivered complete with bear¬ings, sealing boxes and a gravity tank for stern tube oil. The stern tube can be delivered suit¬able for either oil or water lubrication. The sealing boxes are Finnoy’s own design, but other types can also be supplied. The propeller shaft flange is a split type for the smaller shafts and an oil shrink type for the larger shafts.


Propeller Design


All ships have individual needs. Speed is important for some ships. Towing pull is more important for others. To satisfy these needs Finn0y use the most suitable software together with Finn0y’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.
An example of a noz-zled propeller which is designed for high thrust, minimum noise and vibration. Moderate skew design with a blade area Ae/AO = 0,70


An example of an open propeller which is de¬signed for speed, high efficiency and low noise. High skew de¬sign with a blade area Ae/AO = 0,50


An example of an open feathering propeller for a double ended ferry. Good maneuverability, minimum resistance in sailing position. Moder¬ate skew design with a blade area Ae/AO = 0,55





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


Remote Control


Electronic remote control for control of gear¬boxes and cp-propeller systems. Remote con¬trol systems of all types can be supplied, as a single panel for control of pitch and rpm to larger combinator controls and single lever joy-stick systems.