Shiphandling

Bridge Watch Team

JO O D JO O W Q M O W TO P W O Q M O W S ig n a lm an

H elm

L ee H e lm

M essen g er

S ta tu s B oard

P /S /A L ookou ts

B M O W

O O D

Bridge Equipment• Radio hand Sets/speakers

• Status Boards

• Chart Table

• Gyro repeaters

• Magnetic compass

• Radar repeaters

• Alarms/light panels, 1MC

• IC ciruits

• SCC - EOT/Helm or ITC/Helm

Bells

• Backing– 1/3 25 RPM

– 2/3 50 RPM

– FULL 100 RPM

• Ahead– 1/3 025 RPM

– 2/3 050 RPM

– STD 075 RPM

– FULL 100 RPM

– FLK I 125 RPM

– FLK II 150 RPM

– FLK III >150 RPM

Bells

• GT - Controlled by pitch and speed of the propellar

• Diesel - controlled by speed

• Steam - controlled by the speed + 12 kts

Controllable Forces

• Propellers - – single - turn clockwise– double-

• STBD - clockwise

• PORT - counter clockwise

• Side Force - due to the rotation of the screw– none on a twin screw– will force in the direction of rotation. It is as if

the screw is walking on the bottom

Controllable Forces

• Rudder - Usually behind the prop to maximize the thrust

Uncontrollable Forces

• Bernoulli’s– UNREP

• suction

• Bow and stern cushions

• Shallow Water Effects– Pounding– Loss of rudder effectiveness– Sink due to bernoulli’s– Squat

Uncontrollable Forces

• Wind - bigger problem on a carrier

• Current

• Helmsman

Definitions

• Pivot Point - The point on the centerline about which the ship turns– forward

• small - last frame of the bridge

• big - forward of the bridge

– Astern• stern of the ship

Definitions

• Turning circle - line scribed by the pivot point in 360 degree turn– Rudder– Speed - real slow and fast increase the diameter

• Advance - the distance gained toward the original course

• Transfer - the distance gained in the direction of the turn

Definitions

• Tactical Diameter - the amount of transfer made in 180 turn– Standard - std rudder and bell– Reduced - any speed and full rudder

• Kick - swinging of the stern

• Surge - the amount of forward motion while slowing to a slower speed.

MOB• Pass word

• Watch/float/smoke

• Swing stern away

• Select maneuver

• 6+ blasts, oscar, red red pulsating

• Notify company

• Notify CO\XO

• Man helo or boat (ready and make leeward)

• Ensure CIC and top are doing their jobs

• Musters

Types of MOBs

• Anderson

• Racetrack

• Williamson

• Choice depends on time of day, ship, ships in company, sea state and water temp