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SeaStar Power Steering: Steering Cylinder(s) & Helm Pump Selection

8-2
Selection Guide
POWER STEERING
6 23 03
Dia. 3/4"
** 30.65" (778 mm) Extended
* 21.65" (550 mm) Retracted
A
C
B
5.62" (142 mm)
A = 3.20" B = 1.43" C = 1.41"
CYLINDER PART NUMBER
DISPLACEMENT HULLS (standard) DISPLACEMENT HULLS (heavy duty)
PLANING HULLS
SINGLE
9" x 1 CYLINDER (HC5801-2)
UP TO ...................50' (15m) UP TO ....................40' (12m) UP TO ....................65' (20m)
TWIN 9" x 2 CYLINDER (HC5802) UP TO ...................75' (22m) UP TO ....................55' (17m) UP TO ....................85' (26m)
SINGLE
11" x 1 CYLINDER (HC5803-2)
UP TO ...................60' (18m) UP TO ....................50' (15m) UP TO ....................75' (23m)
TWIN 11" x 2 CYLINDER (HC5804) UP TO ...................85' (26m) UP TO ....................60' (18m) UP TO ..................100' (31m)
*SINGLE 9" x 2.5 CYLINDER (HC5805) UP TO .................100' (31m) UP TO ....................70' (22m) UP TO ..................110' (34m)
*TWIN 9" x 2.5 CYLINDER (HC5806) UP TO .................110' (34m) UP TO ....................80' (25m) UP TO ..................120' (37m
* Larger 2.5" cylinder bore than HC5801-2 and HC5802.
All boats over 70' should have steering loads reviewed by factory.
Cylinder Selection Guide
CYLINDER PART NUMBER DISPLACEMENT BORE STROKE OUTPUT FORCE MAX. TORQUE
(35˚ from centre)
SINGLE
9" CYLINDER (HC5801-2)
21.25 in
3
(348cc) 2.0" (51mm) 9" (229mm) 2946 lbs
f
(13,090 N) 18,900 in–lbs (2130 Nm)
SINGLE
11" CYLINDER (HC5803-2)
26.00 in
3
(426cc) 2.0" (51mm) 11" (280mm) 2946 lbs
f
(13,090 N) 23,140 in–lbs (2610 Nm)
TWIN 9" CYLINDER (HC5802) 42.50 in
3
(697cc) 2.0" (51mm) 9" (229mm) 5892 lbs
f
(26,190 N) 37,800 in–lbs (4260 Nm)
TWIN 11" CYLINDER (HC5804) 52.00 in
3
(853cc) 2.0" (51mm) 11" (280mm) 5892 lbs
f
(26,190 N) 46,280 in–lbs (5220 Nm)
SINGLE 9" CYLINDER (HC5805) 37.11 in
3
(608cc) 2.5" (64mm) 9" (229mm) 5154 lbs
f
(22,926 N) 33,065 in–lbs (3736 Nm)
TWIN 9" CYLINDER (HC5806) 74.22 in
3
(1216cc) 2.5" (64mm) 9" (229mm) 10,308 lbs
f
(45,852 N) 66,130 in–lbs (7472 Nm)
Technical Data
Review the Cylinder selection guide below to choose the correct
cylinder for your application, then, consult with helm pump selection
to determine what helm you wish to purchase to provide your desired
wheel turns from hard over to hard over.
The Cylinder Selection Guide below is for vessels fitted with “standard”
rudders currently using SeaStar Steering Systems. For all boats over
70’ and boats that are fitted with large and/or articulating rudders,
steering loads should be reviewed by SeaStar Solutions Technical
Service prior
to selecting your cylinder (see Rudder Torque Data Sheets
on page 9-22
and page 9-23).
Steering Cylinder(s) and
Helm Pump Selection
NOTICE
Helm pump Selection
CYLINDER PART NUMBER
(Single and Twin) (Single and Twin) (Single and Twin)
HELM PUMP 1.4 1.7 2.0 2.4 1.4 1.7 2.0 2.4 1.4 1.7 2.0 2.4
WHEEL TURNS (Hard Over 4.3 3.5 3.0 2.5 5.3 4.3 3.7 3.1 4.3 3.5 3.0 2.5
to Hard Over)
NOTICE
DC Power Steering System is ONLY to be used with a SeaStar 1.4 or
1.7 helm pump. Larger displacement helm pumps CANNOT be used
with DC Power Steering.
* Add 2" (50 mm) to this dimension for HC5803-2. ** Add 4" (101 mm) to this dimension for HC5803-2.