Lewmar 2019

www.lewmar.com MECHANICAL GEARBOX TYPE GEAR RATIO ADVANTAGE AT MID- SHIPS TURNS HO TO HO MAXIMUM RUDDER TORQUE TYPICAL BOAT RANGE Nm ft.lbs m ft WRG11 5:1 8:1 1.8 2943 2170 11.5-14 38-45 WRG12 7:1 10.8:1 2.4.8 5150 3798 13-20 45-65 WRG18 10:1 15.2:1 3.5 10800 7965 18-27 60-90 WRG20 12.6:1 19.1:1 4.4 13700 10104 24-33.5 80-110 WRG45 13:1 20:1 4.6 24000 17701 20-46 90-120 WRG60 24.7:1 37.5:1 8.6 36250 26740 33-45 110-150 WRG90 65:1 96:1 21.6 53000 39090 36.5-61 120-200 Mamba™ – WRG Reduction Gearboxes The WRG series of high-efficiency gearboxes employs precision cut, stub tooth form, spur gears running in deep groove ball and roller bearings. Gear casings are manufactured from marine grade aluminium, and shaft work is in stainless steel or nickel bronze alloy. All gearboxes are CNC machined and grease filled to ensure a perfect fit and maintenance-free life. Additional information 1 Mechanical advantage and turns lock to lock are based on standard lever geometry 2 Overall mechanical advantage and turns lock to lock can be altered via stepped ratio bevels in bevelheads within the system or by non- standard lever centers. 3 Reduction gearboxes can be mounted anywhere within the general proximity of the rudder stock (0.2m/7" to 2m/6.5') For more details please refer to the installation and maintenance handbook. 4 Bevelheads can be directly integrated to all WRG series gearboxes 5 For detailed dimensions contact your Lewmar representative. 89200041 Gearbox (WRG12) 89200046 Gearbox (WRG18) Mamba™ pedestal – BG WRG Integration – For larger aft cockpit yachts, the WRG and BG series gearboxes can be directly mounted to the pedestal. On the WRG12 gearbox and above – a torque adapter plate is provided to transmit the force directly to the underside of the cockpit floor. For raked rudders (25° and above), it is normal to use the BG series of gearbox. Mamba™ – Bevelhead Integration Gearbox WRG type showing directional movement of outer lever and torque tubes Integration – WRG series of spur reduction gearboxes can be supplied with an integral bevelhead fitted to the input shaft as per illustrations below. The bevelhead can be mounted to either side of the reduction gearbox and rotated at any angle. Custom arrangements are available with greater stand offs between the gearbox and bevelhead. Pedestal Gearbox Integration