HYDRAULIC PRO STEERING SYSTEMS FOR BOATS & VESSELS Boats with speeds under 25 knots, the torque of the rudder is calculated by a certain formula dependent on : - The maximum speed of boat - The angle and surface area of the rudder - The total sweep of the rudder (and part of the boat), if the rudder stock is not perpendicular - The Compensating surface of the rudder Note: An important factor for the choice of the steering cylinder is the type of hull (i.e. : planning or displacement) as it can impact the vessel speed: Planing Hull: Boats with planning hulls are designed to rise up and glide on the surface of water when enough power is supplied. While they are like displacement hulls at slow speeds, they ride higher as they move faster. Displacement Hull: Boats with displacement hulls move by pushing the water aside and are designed to cut through the with surface with maximum thrust at low propulsion speeds. SELECTION OF A HYDRAULIC STEERING SYSTEM FOR INBOARD APPLICATIONS Torque Calculation Formula for Speed below 25 Knots:Corrections in function of the type of boat : - For sailing boats : T x 0.5 T = A x [ (0.4 W) – Wc ] x V² x K- For a boat with a steering nozzle : T x 2.0 - For twin engine power boats with 1 rudder : T T = Torque in Kgmx 0.5 A = Total surface area of rudder (H x W) in sq m- For boats fitted with several rudders H = Height of rudder in m(catamarans, trimarans, monohulls) : T x W = Width of rudder in mnumber of rudders Wc = Compensation width in m V = Maximum speed of the boat in knotsNote: If the selected pump has a higher flow K = Coefficient according to total angle of rudderrate & in order to reduce the number of turns, - Port to starboard 70° K = 15.90use a steering wheel with the maximum - Port to starboard 80° K = 17.80recommended diameter. - Port to starboard 90° K = 19.60 H W Wc

HYDRAULIC PRO STEERING SYSTEMS FOR BOATS & VESSELS...The Aluminium Pro Series steering System are ideal for smaller boats like boats of upto 11meters with a capacity of 10-50 people,

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HYDRAULIC PRO STEERING

SYSTEMS FOR BOATS & VESSELS Boats with speeds under 25 knots, the torque of the rudder is calculated by a certain

formula dependent on :

- The maximum speed of boat

- The angle and surface area of the rudder

- The total sweep of the rudder (and part of the boat), if the rudder stock is not

perpendicular

- The Compensating surface of the rudder

Note: An important factor for the choice of the steering cylinder is the type of hull (i.e.

: planning or displacement) as it can impact the vessel speed:

Planing Hull: Boats with planning hulls are designed to rise up and glide on the surface of

water when enough power is supplied. While they are like displacement hulls at slow speeds,

they ride higher as they move faster. Displacement Hull: Boats with displacement hulls move

by pushing the water aside and are designed to cut through the with surface with maximum

thrust at low propulsion speeds.

SELECTION OF A HYDRAULIC STEERING SYSTEM FOR INBOARD APPLICATIONS Torque Calculation Formula for Speed below 25 Knots:Corrections in function of the type of

boat : - For sailing boats : T x 0.5

T = A x [ (0.4 W) – Wc ] x V² x K- For a boat with a steering nozzle : T x 2.0 - For twin engine power boats with 1 rudder :

T T = Torque in Kgmx 0.5 A = Total surface area of rudder (H x W) in sq m- For boats fitted with several rudders H = Height of rudder in m(catamarans, trimarans, monohulls) : T x W = Width of rudder in mnumber of rudders Wc = Compensation width in m V = Maximum speed of the boat in knotsNote: If the selected pump has a higher flow K = Coefficient according to total angle of rudderrate & in order to reduce the number of turns, - Port to starboard 70° K = 15.90use a steering wheel with the maximum - Port

to starboard 80° K = 17.80recommended diameter. - Port to starboard 90° K = 19.60