VARIETY OF ABBREVIATIONS FOR TERMS OF STABILITY By Capt. J.

​VARIETY OF ABBREVIATIONS FOR TERMS OF STABILITY

Mariner

​VARIETY OF ABBREVIATIONS FOR TERMS OF STABILITY

VARIETY OF ABBREVIATIONS FOR TERMS OF STABILITY

By Capt. J.Isbester, Bulk Carrier Practice,

Nautical Institute, 1993

Identity

Ship A

Ship B

Japanese Ship Building

Ship D

Ship E

UK DTp

RINA

Derrett

Stowage factor in cubic

metres per tonne ( or

cubic feet per long ton)

SF

S.F.

SF

SF

Specific gravity

SG

SG

S.G.

SG

SG

γ

SG

Volume of Displacement

in cubic metres

V

V

V

Displacement in tones

Displ

W, Δ

Δ

D

Displ’t

Δ

W, Δ

Tonnes per cantimetre

immersion, in tones

TPC

TPC

TPI

TPC

TPC

TPC

Moment to change trim

one centimetre, in tones-

metres

MTC

MTC

MTI

MTC

MCTC

MCTC

Longitudinal distance from

the longitudinal center of

buoyancy to the

longitudinal center of

gravity, metres

BG

BG = MG-MB

BG

BG

Centre of buoyancy from

midships (†aft),

in metres

LCB

LCB, ÄB

MB

LCB

MB

LCB,ÄB

†LCB

Centre of flotation from

midships (‡aft), in metres

LCF

LCF, ÄF

MF

LCF

MF

LCF, ÄF

‡LCF

Centre of gravity from

midships, in metres

LCG

ÄG

MG

MG

LCG,ÄG

Longitudinal metacentric

height above top of keel

KML

LKM

Longitudinal Moment

L. MOMENT

Centre of gravity above

Baseline / top of keel,

in metres

KG

KG

KG

KG

VCG,KG

KG

KG

KG

Center of buoyancy above

baseline, in metres

KB

KB

KB

KB

VCB

KB

KB

Transverse metacentre

above baseline, in metres

KTM

T.KM

TKM

TKM

TKM

KM(T)

KM

KM

Transverse metacentric

height above center of

graviry, in metres,

without allowing for free

surface effect

GM

GM

GM

GM

GM

GM

GM

GM

Vertical Moment

V. MOMENT

Correction for free surface effect, in metres

GG’

GGo

GoG

GGo

GGv

Transverse metacentric height above center of graviry, in metres, corrected for free surface effect, or fluid metacentric height

G’M, GMf

GoM

GoM

Corr.GM

(*GM)

ÄGM

GoM

GM fluid

GM F

GvM

Moment due to free surface effect

i

F.S.MT.

i

I T

I, i

Right arm, in metres, without correction for free surface effect

GZ

GZ

GZ

GZ

G’Z’

GZ

GZ

GZ

Right arm, in metres, corrected for free surface effect

GoZ

GoZ

GZ

GZ

GZ

GZ F

GZ

Flooding angle, in degrees

qf

qf

f

qf

Heeling angle at maximum GZ, in degrees

qmax

qm

qmax

m

Angle of vanishing stability

qv

q R

qr

Propeller immersion

I/D

I/D

I/D

Block coefficient

Cb

CB

Cb

CB

C B

C B

Prismatic coefficient

Cp

CP

Cp

CP

C P

C P

Waterplane coefficient

Cwl

CW

Cw

CW

C wp

C w

Midships coefficient

Cm

C MID

Cm

CM

C m

C m

Area of waterplane, in square metres

WP

WA

A w

A

Draft

T

d

Draft (forward), as read

df

df

Draft (forward), corrected

dF

dF

D Fore

d fp

d fo, dF

Draft (midships), as read

dm

d Ä, dM

Draft (midships), corrected

dM

d Ä

D Mean

ds

d Ä

Draft (aft), as read

da

d ao, Da

Draft (aft), corrected

dA

dA

D Aft

d AP

da

Mean of forward and aft corrected drafts

dme

dM

dm’

Mean of mean drafts

dM’

CORR.

DRAFT

dm

Forward direction from midships, and trim by head

(+)

(-)

(-)

(-)

(-)

Aft direction from midships, and trim by stern

(-)

(+)

(+)

(+)

(+)

Value of MG, MB, MF is defined that C.G. or C.B. or C.F. is located abaft midship

(+)

Positive BG value is defined that C.G. is located abaft C.B.

In this case the ship trims by the stern.

Air draft: forward, midships, aft

Air d (f, m, a)

Capacity

M**3

Weight

(LT, MT)

Moment

MT-M

Shear Force ( Max/Actual)

S.F.

Bending Moment (Act/Allow.)

B.M.

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