Page 509 - LMS_Catalog_65

STEERING
497
SeaStar Power Steering System
SeaStar Hydraulic Power Steering uses the ship’s engine(s) to provide the “power" for the steering system, via a mechanically or electric motor driven hydraulic pump. A manual hydraulic steering system, consisting of a helm and a hydraulic cylinder (fitted with an integral servo cylinder and a power steering valve), supplies the “control" portion of the steering system. Under normal conditions, with engines running, a hydraulic oil supply is in a stand-by mode, ready to be directed to the steering cylinder as dictated by the steering wheel, servo cylinder and power steering valve. Turning the steering wheel left or right makes the system go from “stand-by" into “operating" mode and move the steering cylinder accordingly. In the event of a power source failure, hydraulic oil from the steering helm is automatically diverted into the servo and steering cylinder, providing the helmsman with manual back-up steering. An engine room mounted oil res- ervoir allows easy fill and assists the in-line cooler in cooling the hydraulic oil. An in-line oil filter helps to protect the steering system components against contaminants.
TYPICAL APPLICATION
APPLICATION
Vessels up to 75 feet with 9" stroke steering cylinder and those up to 100 feet with 11" stroke cylinder. Suitable for single or multiple stations/engines.
FEATURES
• Effortless steering at any speed.
• Responsive 3-1/2 turns lock-to-lock (number of turns
can be varied by helm).
• Easy autopilot interface.
• Automatic manual back-up steering.
HOW TO SPEC A SYSTEM
1. Vessel size and hull type determine the kind of cylinder required. All boats over 70 feet in length should have steering loads reviewed by your salesperson.
2. Engine type determines which power steering pump should be used. If in doubt, contact your salesperson.
3. A SeaStar 1.7 helm is recommended; this will result in
a system with 3-1/2 wheel turns lock-to-lock when 9" stroke cylinders are used.
If a different number of wheel turns is desired, contact your salesperson for recommended helm to achieve desired number of steering wheel turns.
APPLICATION GUIDE FOR POWER STEERING CYLINDERS
The chart below is only a guide to selecting a steering system. A steering system maker cannot anticipate all the variables in boat-rudder design that affect steering loads. It is the final responsibility of the boat designer/builder to specify maximum expected steering loads. Boats over 70 feet should have steering loads reviewed. See your salesperson.
Definitions of terms used in the chart: Planing Hull: maximum hull speed normally exceeds 18 knots; Displacement Hull: maximum hull speed does not normally exceed 18 knots.
FOR VESSEL SIZES UP TO
HELM STEERING
PUMP WHEEL MODEL TURNS
Lock to Lock
REQUIRES
CYLINDER
PART NUMBER(S)
(“ = cylinder stroke) FIG 6564
RECOMMENDED TUBING/HOSE DIAMETERS
MAXIMUM OUTPUT TORQUE FROM CYLINDER(S)
75ft. (23m)
85ft. (26m)
100ft. (31m)
110ft. (34m)
120ft. (37m)
75ft. (22m)
85ft. (26m)
100ft. (31m)
110ft. (34m)
50ft. (15m)
55ft. (17m)
60ft. (18m)
70ft. (22m)
SeaStar 1.7
SeaStar 1.7
SeaStar 1.7
SeaStar 1.7
SeaStar 1.7
SeaStar 1.7
SeaStar 1.7
SeaStar 1.7
SeaStar 1.7
DISPLACEMENT HULLS (HEAVY DUTY)
40ft. (12m)
SeaStar 1.7
SeaStar 1.7
SeaStar 1.7
SeaStar 1.7
SeaStar 1.7
4.25
3.5
4.25
3.5
3.5
3.5
4.25
3.5
3.5
3.5
4.25
3.5
4.25
3.5
80ft. (25m) SeaStar 1.7 3.5 HC5805 + HC5806 (9" 2.5") *
HC5803-2 (11")
HC5801-2 + HC5802 (9")
HC5803-2 + HC5804 (11")
HC5805 (9" 2.5")
HC5805 + HC5806 (9" 2.5")
HC5801-2 + HC5802 (9")
HC5803-2 + HC5804 (11")
HC5805 (9" 2.5")
HC5805 + HC5806 (9" 2.5")
HC5801-2 (9")
HC5803-2 (11")
HC5801-2 + HC5802 (9")
HC5803-2 + HC5804 (11")
HC5805 (9" 2.5")
Power Manual Circuit Circuit
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In. Lb. Kg. m.
PLANNING HULLS
65ft. (20m)
SeaStar 1.7
3.5
HC5801-2 (9")
*
**
18,900
23,140
37,800
46,280
33,065
66,130
37,800
46,280
33,065
66,130
23,140
37,800
46,280
33,065
66,130
210
260
420
520
370
740
DISPLACEMENT HULLS (STANDARD)
50ft. (15m)
60ft. (18m)
SeaStar 1.7
SeaStar 1.7
3.5
4.25
HC5801-2 (9")
HC5803-2 (11")
*
*
**
**
18,900
23,140
210
260
420
520
370
740
*
**
18,900
210
260
420
520
370
740
NOTE: Theoretical torque about pivot point at 35 degrees articulation with 1,000 PSI (70 BAR) system pressure. *No. 206-8 2000 PSI Hose. Special Order
**FIG 1HYN No. MSH5 Tubing or No. 206-8 2000 PSI Hose. Special Order
SEASTAR INBOARD
REFERENCE ONLY
NO LONGER AVAILABLE