Page 361 - Lewmar

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Principle of Operation
Mamba™ steering is a rotating torque tube and bevelhead system, transmitting the helmsman’s input to a high effi ciency
reduction gearbox, mounted adjacent to the rudder stock. A tiller lever is fi tted to the rudder stock and is driven by a similar
lever integral to the gearbox, via a fully articulating jointed draglink.
Two or three station systems, catamarans and tandem wheel steering systems are regularly supplied. The integration of
autopilot drives and remote controlled disengagement units is simply achieved.
The Mamba™ range of steering systems is offered in two sizes, BH10 and BH130, which are coupled with 12 models of
reduction gearbox, providing equipment to suit all craft from 10.6m/35ft to 61m/200ft. In most cases, either high effi ciency
spur, or reduction gearboxes are chosen, offering between 1.0 and 2.6 turns lock to lock. Each option also provides a high
reverse effi ciency, transmitting rudder feel to the helmsman.

To simplify installations, Mamba™ equipment offers the following examples of versatility:

▪ Bevelheads can be supplied with 2, 3 or 4 steering shafts, ▪ A choice of mounting plates and brackets for bevel and
permitting integration for secondary steering stations, gearboxes.
tandem wheel arrangements and direct coupled autopilot ▪ Availability of step ratio gears to adjust overall steering
drives.
ratio.
The lever geometry for Lewmar transmission systems is based on the principle of Wide Angle Geometry.

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