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Fact Sheet

Kamewa™ waterjets A-series

Kamewa A-series waterjet

Kamewa waterjet propulsion concept provides – – – – – – – –

Excellent high speed performance State-of-the-art control system Superior manoeuvrability at all speeds Shallow draught Superior efficiency Reduced noise and vibration levels Increased comfort Simple, reliable and robust construction

A unique concept Kamewa A-series is the first and only aluminium waterjet series in the world with mixed-flow pump technology. Due to the utilisation of mixed-flow pumps, hydrodynamically optimised design and exacting production techniques, the A-series has 510% higher efficiency than the competing aluminium waterjets. This higher efficiency can be utilised for higher vessel speed and/or lower fuel consumption. The impeller, shaft, steering- / reversing rods and optionally also impeller housing, guide vane chamber and steering nozzle are made of stainless steel. All other components are of aluminium construction based on thorough strength calculations to minimise the weight. To minimise wearing and corrosion the aluminium impeller housing is coated with polyurethane coating and stainless steel liner. In case of very hard conditions the Aseries waterjets can be delivered with stainless steel impeller housing, guide vane chamber and steering nozzle for maximum wear and corrosion resistance. These models are called A40S, A45S, A50S and A56S. A water-lubricated cutless bearing is used for ease of service and maintenance. The thrust bearing is well-established and supported on the inlet duct.

A CanMan databus steering/reversing and hydraulic system can be supplied to allow easy installation and high reliability. The CanMan system is redundant on application and network levels as well as on electric supply level. All A-series waterjets can also be supplied as boosters. The documentation can be supplied in either paper or electronic format to ensure easy access for both the builder and the operator of the vessel. On delivery, the Kamewa A-series waterjets are painted and complete with structurally dimensioned inlet ducts for easy installation by bolting and welding. Rolls-Royce - the professional supplier All Kamewa A-series waterjets are produced using the latest 3D CAD/CAM tools to ensure high level of quality and accuracy in design and manufacturing. Rolls-Royce utilises its own proprietary, computerised design program, which contains the latest waterjet technology data combined with the actual results from earlier waterjet installations. Aided by this program, individual influences and the combined effect of all the existing outlet diameters and blade pitch angles will be studied to optimise the performance of every installation.

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Rolls-Royce is the world leader in research, development and manufacture of waterjets for commercial, naval and pleasure-boat markets. Rolls-Royce is the only supplier in the industry with its own, fully equipped hydrodynamic research centre. The centre continously develops and tests new products and refines the existing product line.

Fact Sheet

Displacement table: The table to the right shows maximum displacements for each A-series waterjet. The waterjet unit can be installed on both displacement and planing crafts as single, twin, triple or quadruple systems.

Displacement (tonnes)

Recommended maximum displacement for planing hulls over 30 knots.

For displacement hull applications it is recommended to select a larger jet diameter than required by a faster planing hull at same power. The diagram below shows the suitable engine power rating for different shaft speeds. The A-series offers eight different water outlet nozzle diameters to provide a balance to the waterjet speed, and five different impeller blade pitch angles for fine adjustment of the rpm. The final combination of the outlet diameter and the blade pitch angle will be seeked out by Rolls-Royce to ensure the optimum performance and the lowest possible fuel consumption for the vessel in question.

120 Single installation

100

99

Twin installation

80

66

57

60 42

40 20

75

Triple installation

50

38

28 14

33

25

19

0 A40

A45

A50

A56

Kamewa waterjet size The diagrams are for preliminary waterjet selection only. Consult Rolls-Royce in all cases for a size selection.

Power/speed per unit

Main data Power range

size

(kW)

A40 A40S A45 A45S A50 A50S A56 A56S

500-1400 500-1400 650-1650 650-1650 850-2100 850-2100 1100-2800 1100-2800

Measurements in mm

Weights in kg

A

B

C

D

E

F

G

H

J

K

L

R

1042 1042 1172 1172 1303 1303 1460 1460

1339 1339 1506 1506 1676 1676 1872 1872

1422 1422 1595 1595 1753 1753 1963 1963

12 12 12 12 15 15 15 15

440 440 495 495 550 550 616 616

150 150 150 150 150 150 150 150

2370 2370 2700 2700 2980 2980 3330 3330

66 66 66 66 75 75 75 75

952 952 1050 1050 1170 1170 1290 1290

1151 1151 1295 1295 1439 1439 1610 1610

850 850 940 940 1050 1050 1150 1150

150 150 150 150 150 150 150 150

DW1)

770 900 990 1180 1380 1650 1860 2230

WW2)

DWH3

256 256 365 365 500 500 703 703

55 55 55 55 55 55 55 55

1) Dry weight of the unit incl. cylinders and shaft flange 2) Weight of the water in the pump and inlet duct 3) Dry weight of the hydraulic unit with PTO Pump The data is subject to change by the manufacturer without prior notice

Rolls-Royce Oy Ab P.O. Box 579 FIN-67701 Kokkola, Finland Tel: +358 6 832 4500 Fax: +358 6 832 4512 www.rolls-royce.com

© 2002 Rolls-Royce plc Whilst this information is given in good faith, no warranty or representation is given concerning such information, which must not be taken as establishing any contractual or other commitment binding upon Rolls-Royce plc or any of its subsidiary or associated companies.

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