The Cattleya will have be larger, more advanced and again powered by MAN Diesel & Turbo’s L27/38 propulsion package.

The approx. 4,000hp propulsion package for the new Cattleya will include main engine and box coolers, reduction gear with hydraulic shaft brake and a 1,800kW PTO and shaft alternator, propeller shaft line, sterntube, propeller and propeller nozzle– together with a complete propulsion control and safety system with manoeuvre stations for four bridge positions.

Capacity step-up

The name Cattleya will be continued from Mr Pedersen’s current vessel and a quick comparison of the vessel specifications shows a radical capacity step-up. The length oa grows from 62.6m to 69.9m, and with 1.4m additional width the tonnage increases from 1,337 to 1,750. Furthermore the new vessel is based on state-of-the-art shipboard equipment and new design solutions together with the fine craftsmanship from Karstensens Shipyard.

The MAN L27/38 powered propulsion package might be seen as a direct repeat from the current vessel, but the 9-cylinder 2,999kW Tier-II engine will be coupled to an (Alpha Module Gear) AMG55 gearbox with a large speed reduction ratio of 800:119r/min for an even larger and more efficient 4.2m ducted CP Propeller. The new high-efficient (Alpha High Thrust) AHT propeller nozzle has been specified in this case for ‘headbox’ mounting. The optimisation and adaptation of the large propeller and nozzle into the vessel’s aft ship design has been carried out in close cooperation with Karstensens’ naval architects and engineers. A propeller and propulsion-optimised aft ship solution equals energy optimisation, resulting in fuel consumption savings and less exhaust gas emission. The fine tuning of the final propeller blade design has been based on a careful assessment of the vessel’s predicted operational power/speed/duration profiles – considering the compromises in finding the perfect design solution for, for example, high-speed steaming and maximum pulling power efficiency at trawling speed with suppression of cavitation and noise.

As a result of the vessel’s floating frequency system (from 60 to 50Hz), the propulsion system is also able to operate in ‘shaft alternator mode’ with reduced engine and propeller speed. With this part-load optimisation feature, offering up to 16.7% lower engine/propeller speed, the fuel consumption is further reduced.

Additionally, the vessel’s electrically-driven retractable 800kW azimuth thrusters propeller can be deployed for low power propulsion, standby, take-home and manoeuvring modes.

More fishing vessel propulsion in the pipeline

The MAN L27/38-based propulsion package is popular for high-end Scandinavian and North Atlantic fishing vessels, and Karstensens Shipyard is well positioned in this market. Other recent fishing vessel orders from the yard to be powered by the 2,999kW L27/38 propulsion packages from MAN Diesel & Turbo, Frederikshavn are:

• Havsnurp – for Havsnurp AS (Kjell Inge Hole and Karstein Stølen, Norway)
• Gollenes – for Gollenes AS, (Frode Kvalsvik & Asbjørn Ose, Norway)

Both vessels are 62.6metre 1,375GT combined purse seiner trawlers – and continues the earlier L27/38-powered Strømegg, Western Viking and Girl Stephanie deliveries.

Vessel details

Yard: Karstensens Shipyard, Skagen, Denmark
Yard number: 420
Delivery: October 2012
Owner: Cattleya A/S, Flemming Pedersen, Esbjerg, Denmark
Length oa: 69.6m
Width: 14.2m
Depth: 8.70m
Gross tonnage: 1,750
Speed: 16kn (estimated)
Bollard pull: 68 tons (estimated)