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Steering system for inboard

INBOARD HYDRAULIC STEERING SYSTEMS**

Boat lenght up to	20 ft.	30 ft.	40 ft.	44 ft.	45 ft.	55 ft.	60 ft.
Single engine pleasure	GE30	GE50	GE75	GE75	GE180	GE350	GE560
Single engine work engine work	GE30	GE50	GE75	GE100	GE180	GE560	GE560
Double engine pleasure	GE50	GE50	GE75	GE100	GE350	GE560	GE560
Double engine work	GE50	GE75	GE100	GE100	GE350	GE560	GE560

**Table data are only indicative, the choice of the inboard hydraulic steering system is subordinate to the torque calculation formula.

SELECTION OF A HYDRAULIC STEERING SYSTEM

For boat fitted with a rudder with speed not exceeding 25 knot, the torque of the rudder or rudders is calculated according to the following formula and corrections.
It must be known that the torque necessary to manoeuvre a boat depends on:
- the speed of the water flowing on the surface of the rudder at a certain angle (not max speed).
- the rudder size.
- the total sweep of the rudder (and part of the boat), if the rudder shaft is not perpendicular.
- the compensating surface of the rudder.

INBOARD HYDRAULIC STEERING SYSTEMS (Torque calculation formula)

Torque Calculation Formula for Speed below 25 Knots

Qr =A x [(0,4b) – e ] x V² x K

Qr = torque in kgm
A = Total surface of rudder ( h x b ) in sqm
h = height of rudder in m.
b = Width of rudder in m.
e = Compensation width in m.
V = (Maximum speed) of the boat in knots.
K = Coefficient according to total angle of rudder
Port to starboard 70° K = 15,89
Port to starboard 80° K = 17,80
Port to starboard 90° K = 19,52

Corrections in function of the type of boat:
- for sailing boat Qr x 0,5
- f or a boat with a steering nozzle Qr x 2.0
- for twin engine power boat with 1 rudder Qr x 0,5
- for boat fitted with several rudder (catamarans, trimarans, monohulls) multiply the calculated torque result by the number of rud ders fitted on the boat.
Once the torque is known, the appropriate cylinder is selected and one or two manuals pumps will be added
accordingly.

Warning: if you select a pump with a higher flow rate in order to reduce the number of wheel turns , you will have to fit a wheel with a bigger diameter.

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