www.lewmar.com Fig 1 Ø Min. 100 mm (4") Min. 0.75 Ø OPTIMUM AREA Fig 2 m ft 9 30 m ft 11 35 m ft 12 40 m ft 14 45 m ft 21 50 m ft 17 55 m ft 18 60 m ft 20 65 m ft 21 70 m ft 23 75 m ft 24 80 m ft 26 85 m ft 27 90 m ft 110TT 1.5 125TT 2.0 140TT 2.0 140TT 2.2 185TT 3.0 185TT 4.0 185TT 5.0 185TT 6.0 250TT 8.0 300TT 10.8 250TT HYD 300TT 15.0 300TT HYD 10 35 m ft 12 40 m ft 15 50 m ft 18 60 m ft 21 70 m ft 24 80 m ft 27 90 m ft 30 100 m ft 33 110 m ft 36 120 m ft 39 130 m ft 42 140 m ft 45 150 m ft 48 160 m ft 250 20HP 300 30HP 400 60HP 500 80HP 600 100HP The boat’s wind area, the ‘lateral wind draft area’, and the thruster’s tunnel position in the hull determine the thruster’s performance on a boat. By knowing these factors we can calculate the wind pressure on the boat and the centre point of this wind pressure. From these calculations we can determine what thrust is needed to counter the wind pressure with the given thruster position.To gain total control of your boat, install both a bow and stern thruster, leaving the main engines to propel the boat forward and backward. The main factors that decide correct thruster sizing are: 1 Position of the thruster The actual position of the thruster will depend on the internal & external construction of the vessel. For optimal performance the thruster should be mounted within the following parameters: ▪ As far forward as possible to maximise the lever effect. (Fig 1) ▪ 1 x Ø (0.75 x Ø minimum) below the waterline to prevent air being sucked into the tunnel. (Fig. 2). Ø=Tunnel Diameter. ▪ Minimum suggested tunnel length 2 x Ø. How to choose the right thruster for your boat 2 Boat size, type and shape High control / Heavy boat Medium control / medium displacement Light control / light displacement Light displacement / low windage Medium displacement / Medium windage Heavy displacement / High windage Vertical Retracting and Swing Thrusters Size Guide Boat length overall
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