MAN acquires Kappel propeller designs

04 Apr 2012
Five-bladed Kappel tip fin design FP propeller – the Kappel propellers will cover a power range of 4MW to 40MW, enabling their application to MAN B&W low-speed engines up to the G80ME-C9 series

Five-bladed Kappel tip fin design FP propeller – the Kappel propellers will cover a power range of 4MW to 40MW, enabling their application to MAN B&W low-speed engines up to the G80ME-C9 series

The board of MAN Diesel & Turbo has announced that the company has acquired Kappel Propeller - including designs, software, and intellectual property together with continued co-operation with Jens Julius Kappel.

According to MAN, this will provide additional fuel-saving and energy-efficient propulsion opportunities under the MAN Alpha propeller programme, which now offers Kappel tip fin propeller blade designs for both CP propellers and FP propellers.

The takeover contract was originally signed on 29 February in Copenhagen, Denmark by JJ Kappel and Torben Johansen on behalf of MAN Diesel & Turbo. Mr Kappel said after the contract signing: “We have had a good co-operation with MAN Diesel & Turbo for almost 10 years, and our joint projects have gone well. I hope that MAN will get the most out of the Kappel technology. Our co-operation does not end here – it will in fact become more intense”.

The co-operation between Kappel and MAN Diesel & Turbo officially started in December 2003 when the Frederikshavn facility celebrated 100 years of MAN Alpha CP Propeller production. Subsequently, MAN Diesel & Turbo received a contract to supply Kappel CP propeller blades as part of Scandlines’ extensive refurbishment of the two ferries. This was later followed by a successful Kappel upgrading of four more Scandlines vessels.

MAN intends to incorporate the Kappel technology into various other energy-saving solutions including hydrodynamic integration of rudder bulbs, high-efficiency rudders, hull flow-guiding devices and ducts.

Compared to conventional designs, the Kappel propeller blade is said to offer fuel savings of up to 6%, provided by the blade design alone, not counting improvements to associated components. MAN says that optimised propeller and propulsion efficiencies will contribute to lowering the EEDI (energy efficiency design index) of ships, in this case by up to 6%.

MAN will apply its newly-acquired  technology to both newbuilding and retrofit installations, especially in retrofits where ships undergo a changed operational profile with slow-steaming and de-rating of main engines.

Compared to a conventional design the Kappel propellers have shown lower pressure impulses which can be utilised for bigger and more efficient propellers because of the reduced clearance between hull and propeller tip. Combined with the G-type MAN B&W engine, further improvement in propulsion efficiency can be exploited. The new ultra-long stroke low-speed G-type has a longer stroke and lower engine speed with increased engine efficiency – and deploys a larger and more efficient propeller for tomorrow’s energy-optimised aft ship designs. In that combination fuel consumption and CO2 emission could be reduced by up to 10%.

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