shiphandling ii

7/21/2019 Shiphandling II

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Shiphandling/WatchstandingSeminar II


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Shiphandling Theory'Motion

(ario!s forces acting on the shipcreate mo%ement)

*ewton+s Laws of Motion

,) Unless acted !pon by an o!tside

force'-n ob.ect in motion tends to stay in motion)

-n ob.ect at rest tends to stay at rest)

) The res!lting motion of an ob.ect isthe s!m of all forces acting on it)

0) 1%ery action has an e2!al andopposite reaction)


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Shiphandling Theory'Forces

Controllable 3ropeller

&!dder

4owThr!ster/-3U

Mooring Lines

-nchors

T!gs

Uncontrollable Wind

C!rrent/Tides

Seas Water 5epth


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Controllabl

e Forces


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3ropellers

3ro%ides the most importantso!rce of force on a ship)

6Us!ally7 ma"es ship go forward)

Most ships ha%e propellers)

-ircraft carriers / 3atrol Craft ha%e8)

Frigates ha%e ,)

ControllableForces


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3ropellers

Forces res!lting from the !se ofthe propellers'

Forward 6or re%erse7 thr!st

Side Force

ControllableForces


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3ropeller Thr!st

- res!lt of the propeller spinningon its shaft)

Ca!sed by a press!re di9erentialbetween the opposite sides of the

propeller blade)

ControllableForces


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3ropeller Thr!st

&otation ofpropeller blade

Water FlowLow 3ress!re

#igh 3ress!re

3ropeller4lade

&es!lting Thr!st

ControllableForces


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Controlling 3ropeller

Thr!st 5epends on type of propellers

Fi:ed 3itch 3ropellers

Controllable 3itch 3ropellers

ControllableForces


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Controllable 3itch

3ropellers Fo!nd on all gas t!rbine ships and

some diesel amphibs

; < , "ts shaft rotates at == &3M

thr!st 6speed7 controlled by changingthe pitch of the propeller blade

ControllableForces


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Controllable 3itch

3ropellers >, "ts

thr!st controlled by changing the

speed 6&3M7 of the shaft)

The shaft always spins in same

direction whether going forward orbac"ward)

ControllableForces


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Fi:ed 3itch 3ropellers Fo!nd on steam ships 6carriers? s!bs?

amphibs7

Cannot change pitch of propeller

Thr!st 6speed7 controlled by changingspeed of the shaft

To go bac"wards? m!st stop shaft andspin the shaft in the opposite direction)

ControllableForces


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Side Force

Ca!ses stern to mo%e sideways inthe direction of propeller rotation)

3ropeller

ControllableForces


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Side Force

SideForce

Bottom

Single ScrewGoing Ahead

AheadAsternTwin Screw

SideForce

SideForce

ControllableForces


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Screw C!rrent

Consists of two parts S!ction C!rrent < going into the

propeller 5ischarge C!rrent 63rop Wash7


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&eco%ery Mane!%ers

Williamson T!rn

-nderson T!rn

&ace Trac"D


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1asiest Method

5aylight' -nderson

*ight' Williamson

S!bs' D bac"ing Carriers' &acetrac"

4oat / #elo

Shiphandling' Man $%erboard &eco%ery


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&eco%ery considerations

#elicopter a%erage time to ready for ta"eo9 is

,;


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Small 4oat Considerations

331 for boat crews

manning

co:swain

bow hoo"

corpsman

boat oQcer

signalman S-& swimmer

0


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Initial -ctions -pplicable for all reco%eries'

F!ll r!dder to side of ship where person fello%erboard)

F!ll speed)

Throw smo"e @oat? life ring

Eeep in sight 3ass the word

short blasts

Mar" on chart

Man 4oat 5ec" *otify other ships? #elos

&ecei%e m!ster report

Follow on actionsShiphandling' Man $%erboard &eco%ery


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Follow


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&ight F!ll &!dder

-ll 1ngines -head F!ll

Eic"s Stern -wayMan $%erboardStarboard Side



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Williamson T!rn

Shift &!dder

When ;G $9 Co!rse



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mane!%ering

Williamson

portport starboardstarboard- slow- slow

- good for night- good for night

or low visor low vis

60 deg60 deg

Shi

phandling' Man $%erboard &eco%ery


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-nderson T!rn



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mane!%ering

-nderson

portport starboardstarboard

- fastest- fastest

- most skill- most skill



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&acetrac" T!rn



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mane!%ering

&ace trac"

portport starboardstarboard

- high speed- high speed

- easier approach- easier approach



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D


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mane!%ering

D


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mane!%ering

tear drop

portportstarboardstarboard

- Carriers- Carriers

modifiedmodified

racetrackracetrack


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shiphandling ii

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