During the design process of the newbuildings ”Canopus” and ”Carpe-Diem” there has been a close cooperation between owners, Hundested Propeller and Karstensen Shipyard in order to try to design as efficient a propulsion system as possible. This has resulted in a very large, 3-bladed propeller and a reduction of the main engines 1800 rpm to 168 rpm on the propeller. Further on, the propeller is operating inside a steering nozzle, which experience has shown is also adding efficiency.
Thus it was with great pleassure and pride, that owners, propeller designer/supplier and yard on Tuesday (7/7) evening got confirmation of the theories. The initial calculations from Hundested Propeller suggested a pull of just-over 21 kg / HP. The physical bollard pull test, however showed that the maximum pull reached 21,9 kg / HP ! As far as we are aware this is (by far) record in Denmark, and to our knowledge there will hardly be any fishing vessels abroad with similar pull.
Last year Karstensen Shipyard delivered 2 vessels to Scotland, also with propulsion plant designed in conjunction with Hundested Propeller. On these 2 vessels a pull of 20,2 kg / HP was achieved. Traditional plants are normally showing 15-16 kg / HP. Ie the previous ”Carpe-Diem” had 14,7 kg / HP. Converted the main engine was using 86 l/h to pull 7,0 t. The meassurements on the new vessel showed a consumption of 54 l/h at 7,0 t pull – this equals a reduction in fuel consumption of 37% ! The previous ”Canopus” was considerably more optimized, and pulled 18,5 kg / HP. Thus the efficency has been improved with 18% compared to this vessel.
