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Programming Box

2203848 Equipped programming box DEH ECO
The programming box allows to adjust the cylinder setup (direction and positions). It connects instead of the autopilot computer during the implementation phase. It will potentially monitor the responsiveness of the autopilot and makes the cylinder bleeding procedure easier.


  • Facilitate the cylinder bleeding procedure.
  • Set the cylinder travel stops (max-min).
  • Determine the cylinder motion direction.
  • Shift the midpoint of each cylinder stroke if required.
  • Memorize the midpoints of the electric wheel(s) displacement.


2203848 Programming Box

Tiller Arms up to 500 kgm

2203306 Pilot bored equipped tiller arm LS 90 kgm
Ø 28 pilot bored – maxi Ø 50>

Pilot bored equipped tiller arm LS 90 kgm
Pilot bored equipped tiller arm LS 90 kgm Dimensions Drawing

2203307 Pilot bored equipped tiller arm LS 148 kgm
Ø 28 pilot bored – maxi Ø 50>

Pilot bored equipped tiller arm LS 90 kgm
Pilot bored equipped tiller arm LS 148 kgm Dimensions Drawing

2203308 Pilot bored equipped tiller arm LS 254 kgm
Ø 28 pilot bored – maxi Ø 50>

Pilot bored equipped tiller arm LS 90 kgm
Pilot bored equipped tiller arm LS 254 kgm Dimensions Drawing

Hydraulic Power Packs DEH ECO

Hydraulic power packs consist of a brushless electric motor coupled to a 6 or 9 litre/minute submersible pump in function of the cylinder volume to be fed. They also feature a hydraulic distribution block fitted with its coils and delivery solenoid valves and its circuit protection components. The oil tank is equipped with an oil level sight glass, a filler cap and an additional opening to allow draining. These power packs support the logic controller to which the electrical harness is connected.

2203790 Hydraulic Power Pack DEH ECO 6 l/mn 12V
2203872 Hydraulic Power Pack DEH ECO 6 l/mn 24V
2203873 Hydraulic Power Pack DEH ECO 9 l/mn 12V
2203874 Hydraulic Power Pack DEH ECO 9 l/mn 24V
Dimension Drawing for 2203790, 2203872, 2203873 and 2203874

Hydraulic Power Pack DEH ECO

Receivers Cylinders Linear Sensors

The cylinders provide the power of the steering system.

They are selected by using the methods described in menu « Selection of the steering system ».

All the cylinders are supplied with their pre-assembled and adjusted linear sensors. The linear sensor is supplied pre-wired with a pre-swaged connector half.

2203810 VHM 40 DTP C234 + Linear Sensor
2203811 VHM 40 DTP C234 + Reversed Linear Sensor
Maximum torque90 kpm633 ft.lbs
Stroke228 mm9″
Maximum pressure50 bars725 PSI
Volume215 cc13.1
Radius of tiller arm192 mm7 (9/16″)
Total rudder angle73° (2×36,5°)
Weight5,1 kg11.2 lbs
Dimension Drawing for 2203810 and 2203811

2203874 VHM 50 DTP + Linear Sensor
2203875 VHM 50 DTP + Reversed Linear Sensor
Maximum torque148 kpm1091 ft.lbs
Stroke228 mm9″
Maximum pressure50 bars725 PSI
Volume352 cc21.5
Radius of tiller arm192 mm7 (9/16″)
Total rudder angle73° (2×36,5°)
Weight7,5 kg16.5 lbs
Dimension Drawing for 2203874 and 2203875

2203437 VHM 60 DT + Linear Sensor
2203876 VHM 60 DT + Reversed Linear Sensor
Maximum torque254 kpm1873 ft.lbs
Stroke228 mm9″
Maximum pressure60 bars 870PSI
Volume505 cc30.8
Radius of tiller arm192 mm7 (9/16″)
Total rudder angle73° (2×36,5°)
Weight18 kg39.7 lbs
Dimension Drawing for 2203437 and 2203876


2201143 Joystick

The joystick control operates on an “on-off” basis. The direction of the control lever corresponds to the desired direction the boat is to be steered to. When released, the control lever goes back to its neutral position automatically but the cylinders remain in their last positions. To bring them back to their central positions, the joystick control lever will have to be operated.

Dimensions Drawing

540° Electric Wheel (1.5 turn with automatic recentering)

Electric Wheel 2.5 Turns

With this sturdy designed electric wheel, it takes 540° (1.5 turn) for the cylinder(s) to travel their full strokes. The electric wheel is affixed with three screws behind a bulkhead and is connected to the electric harness with an identified, pre-swaged connecting pin. It is equipped with a standard conic shaft end. Thanks to the automatic recentering function, it can be used for twin steering station installations with two steering wheels.

2203287540° Electric Wheel (1.5 turn with automatic recentering)
Dimension Drawing

Torque Calculation

For boats fitted with a rudder with speed not exceeding 25 knots, the torque of the rudder(s) is calculated according to the following formula and correction coefficients.

It should be pointed out that the necessary torque to manoeuver a boat depends on:

  • The speed of the water flowing on the surface of the rudder at a certain angle
  • The rudder dimensions
  • The total sweep of the rudder (and part of the boat), if the rudder stock is not perpendicular
  • The compensating surface of the rudder (balanced rudder)
    Torque Calculation Formula for Speed below 25 Knots

    C = S x [ (0.4 Lg) – Lc ] x V² x K

C = Torque in kpm schema_safran
S = Total surface of rudder (H x Lg) in sq. m
H = Height of rudder in m
Lg = Width of rudder in m
Lc = Compensation width in m
V = Maximum speed of the boat in knots
K = Coefficient according to total angle of rudder

Port to starboard70°K = 15.89
Port to starboard80°K = 17.80
Port to starboard90°K = 19.52

Torque Diagram

Corrections in function of the type of boat:
For sailing-boatsC x 0.5
For a boat with a steering nozzleC x 2.0
For twin engine power boats with 1 rudderC x 0.5
For boats fitted with several rudders (catamarans, trimarans, monohulls)Multiply the calculated torque result by the number of rudders fitted on the boat

Once the torque has been calculated, the appropriate cylinder(s) will be selected and the remaining components of the steering system can be defined.

Description of LS Electro-Hydraulic Steering Systems

In general, the basic setup of an electro-hydraulic steering system includes:

  • Receivers – cylinders with linear position sensors.
  • Transmitters – electric wheels, FFU or NFU joysticks, selectors.
  • Programmable logic controller with or without customizable multifunction screen display.
  • Clearly labelled electrical harness with connecting pins.
  • Hydraulic power pack and oil tank equipped with filters, oil level and temperature alarms.
  • Proportional hydraulic distributor with independent circuits or hydraulic distribution block.
  • Set of hydraulic flexible tubes with swaged fittings.

    Some classification societies require additional safety components. In this case, please contact us.

In operating condition, the programmable logic controller continuously analyses the information sent by the cylinder position sensors and relays the orders from the transmitters.

It manages the position and the displacement of each cylinder by means of the hydraulic power pack and the hydraulic distribution system.

DEH Automate programmable

Depending on the selected model, a screen display can allow for navigation scrolling through pages and menus, activation or deactivation of an individual receiver or transmitter, thus providing a broad range of applications (safety, maintenance, intervention…). It also allows the fine-tuning of rudder angle settings (Ackerman effect…), reaction speed and rudder alignment. Finally, it triggers alarms (temperature, oil level, filter clogging…) and permits to isolate the components concerned.

DEH Automate programmable

The elimination of hydraulic circuits in the boat inhabitable parts and of the mechanical tie bars between the rudders, the lack of interventions on often complex hydraulic circuits such as filling and bleeding are all reasons that make the electro-hydraulic steering system a technically and economically sound solution that meets all of the market requirements.

Electro-Hydraulic Power Pack

Electro-Hydraulic Steering Systems “Steer-by-Wire”

Lecomble & Schmitt has developed a range of electro-hydraulic steering systems to meet the evolving challenges of steering gear for boats.

Drawing on more than 50 years of experience at the service of the leading shipyards, L.S. offers in this catalogue a comprehensive selection of the best-performing and reliable electric and hydraulic components to compose the best suited electro-hydraulic steering for power and sail boats with a total rudder torque up to 4.000 kgm.

The design efforts for this product range mainly focused on the content of the logic controller programs, the components high reliability in the face of most difficult navigational conditions and the ease of integration and implementation of the system inside the boat.