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| | DO THEY AFFECT THE SPEED? In smooth water with the stabilizers not in use, the speed reduction is negligible (for example: about 1 knot at 25 knots for a 25 metre vessel). In heavy seas however, a vessel using stabilizers has the advantage, because the marine boat rolls less and therefore has a lower wetted surface area. | WHICH SIZE? The fin manufacturer size can be calculated using the following formula: Fin surface in m2 = 3,5 x B x D T2 x V2 Where: B is the waterline beam in metres.
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| | D is the displacement in metric tons. T is the roll period in seconds. This is the time taken to roll from starboard to port and back to starboard again. The amplitude is not important here since the roll period always remains constant. The roll period can therefore be measured fairly easily by causing the vessel to roll gently when moored alongside the quay. V is the cruising speed in knots. | | |
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| | THE POSITION OF THE FINS The stabilizers are most effective if they are located 40 to 50% of LWL from the bow. The fin tips must be located within the beam of the vessel as far as is possible, so as to avoid damage when mooring alongside. Guide bushes must be laminated or welded through the hull sections for the fin stocks to pass through. | | |
| | EXAMPLE A 13.5 m motor boat yacht has waterline beam of 3.6 m. The displacement is 23 metric tons and the cruising speed is 8.5 Roll period is 3.5 sec. The recommended fin size is as follows: 3,5 x 3,6 x 23 = 0,33 m2 3,52 x 8,52 Thus, a fin size of 0.4 m2 should be chosen or 0.3 m2 if space is restricted. | | |
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| | SCOPE OF SUPPLY • A set consisting of four hydraulic cylinders with associated valve block, a control panel and a solid-state gyroscope (which registers the vessels movement). The standard power supply is 24 Volt DC (a 12 volt to | | |
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| | 24 volt transformer is available as
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| | From the control panel the stabilizers can be switched on or off or centered for when going astern. The required amount of damping can be adjusted and the roll amplitude is displayed. Dimensions: 210 x 85 x 103 mm | an option). • A pair of fins. The stock and blade are made from stainless steel and the blade is filled with polyurethane. There is a choice of 5 fin sizes available: 0.3, 0.4, 0.5, 0.6 and 0.7m2. • A pair of guide bushes, available for steel, GRP or aluminum hulls. The high pressure hoses are not included and should be ordered separately to the required lengths. VETUS STABILISERS OVERVIEW • "Plug and Play" installation for steel, GRP and aluminum vessels. • Fully automatic operation. • The fin movement is automatically adjusted according to the degree of damping selected, the speed of the vessel and the sea state. • All electronic components are solid state. | |
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