To increase your boat's manoeuverability in a marina, a lock or at low speed, then a Lewmar bow thruster is the solution. With a powerful 12V electric motor of 4HP and giving 58 kgf (128lb.) of thrust. Unique 5 blade propeller is strong and produces equal thrust in both directions. 185mm tunnel. Control panel, cabling and tunnel not included. Contact us to get the ideal Lewmar TT bow thruster for your boat, and the right accessories. ***Boat lentgh suggestion for medium displacement sailboat and powerboat for docking in wind effect conditions of 17 to 21 knots.