LEGEND:
Blue = information provided.
Black = calculated values.
Red = table values, etc.
Green = ANSWER
Use the cross curves to determine the righting arm at 15º which is 1.75'.
Actual KG
22.40'
Assumed KG
20.00'
KG
ACT
- KG
ASS
= Difference
2.40'
4. Use the SIN curve to correct the arm for the Actual KG.
Find the arm at 15º inclination
SIN 15º =
0.2588
Correction = (Actual KG - Assumed KG) x Sin Angle
0.6212'
5. The answer is the base arm at a given angle - corrected for KG
Righting Arm - Correction = 1.75' - 0.62' = 1.13'
6. Righting Moment = Corrected Arm x Displacement
Righting Moment =
1.13' x 9440 T
Righting Moment =
10656.2 ft tons
Select the closest answer.
A) 10,656 foot-tons
ANSWER
B) 12,340 foot-tons
C) 13,980 foot-tons
D) 17,520 foot-tons
Correction = 2.40' x 0.2588 =
2426-sa-4.pdf
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