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The Jefa RG10 reduction gearbox transforms a rotational movement into
a push-pull movement. The reduction gearbox is always positioned close to
the rudder stock. Via a draglink with rose joints, the push-pull movement
is transmitted to the tiller lever and rudder shaft. The RG10 gearbox
is very versatile as it can be equipped with one (standard), two or three input
shafts. On top of that one can choose the output shaft at the opposite
side of the input shafts (type 1) or at the same side (type 2). The gear
ratio can be 1:3.2 (1.15 revolutions of the input
shaft for a corresponding 72 degrees of rudder travel) or 1:5 (1.8 revolutions of the input
shaft for a corresponding 72 degrees of rudder travel). This can be
increased with steps of 1.2:1 by using step ratio bevel boxes. The output
lever centres are 130 mm to a corresponding 200 mm centres of the tiller
lever. This difference in length results in the so called "wide angle
geometry". Please click here for more in
depth explanation. The 1:3.2 version is used for cruising/racing yachts
with a big wheel (>1500 mm) fitted to achieve a direct and responsive
steering (X43 and X46 example). The 1:5 version is
used on yachts with smaller wheels (<1400 mm) when more revolutions are
required.
The RG10 gearbox has 4 positions to integrate an optional autopilot drive
unit. Integrating an autopilot drive in a steering system has never been
so easy.
The maximum input torque is 40.5 KgfM resulting in a maximum rudder torque
at full rudder of 378 KgfM when the 1:3.2 input is used and 591 KgfM when
the 1:5 input is used. This makes the gearbox suitable for boats from 30' to
around 48'. Except for the input shafts and the gears, the complete
gearbox is machined out of solid aluminium 6082 for maximum strength and minimum
weight. Positioning the reduction gearbox correctly to the
rudderstock is very important for the wide angle geometry to function
correctly. Please look at the mounting examples at the bottom of this
page. Please click on the pictures for a
larger view.
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