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SeaStar Rudder Torque Data Sheet: Planing Hulls

SEASTAR and BAYSTAR Hydraulic Steering Systems
9-23
Rudder Torque Data Sheet
TORQUE DATA SHEETS
PLANING HULLS
ONLY
C
B
A
C
L
C
L
Lower Rudder Bearing
Formula presumes 23%–27% counterbalance
A Perpendicular distance from the
rudder shaft to the propeller.
B Distance parallel to rudder shaft
from rudder base to center of lower
rudder bearing.
C Perpendicular distance from waterline
to rudder base.
Note:
Projected area of rudder is H & W less C.B.
Name: . . . . . . . . . . . . . . . . . . . . . .
Contact: . . . . . . . . . . . . . . . . . . . . .
Speed of vessel: . . . . . . . . . . . . . . . knots
Length of vessel: . . . . . . . . . . . . . . feet inches
Catamaran: . . . . . . . . . . . . . . . . . . Yes No
Number of rudders: . . . . . . . . . . . . .
Rudder area (projected area): . . . . . square feet
Propeller diameter: . . . . . . . . . . . . . feet inches
Perpendicular distance from the
rudder shaft to the propeller: . . . . . . feet inches
Distance measured parallel to the
rudder shaft from the base of the
rudder to the center of the
lower bearings: . . . . . . . . . . . . . . . . feet inches
Average rudder chord length: . . . . . . feet inches
Perpendicular distance from the
waterline to the rudder base: . . . . . . feet inches
Rudder shaft diameter: . . . . . . . . . . feet inches
Shaft power: . . . . . . . . . . . . . . . . . . horsepower
Print/Scan COMPLETED form.
email to [email protected], or, fax to 604-270-7172
Estimated load on rudder. It is suggested that you confirm load
with your Naval Architect.
Please include a detailed drawing of your rudder.