USCG Exam Practice · Vessel stability — metacentric height, free surface
Under 46 CFR §28.570, what is the minimum area required under the righting arm curve from 0° to 30° angle of heel for a fishing vessel in each condition of loading?
- A16.9 foot-degrees (0.090 meter-radians)
- B5.6 foot-degrees (0.030 meter-radians)
- C15.0 foot-degrees (0.080 meter-radians)
- D10.3 foot-degrees (0.055 meter-radians)✓ correct
Why D is correct
46 CFR §28.570(a)(5) requires an area under the righting arm curve of at least 10.3 foot-degrees (0.055 meter-radians) up to an angle of heel of 30°. The value of 16.9 foot-degrees applies to the area up to the lesser of 40° or the downflooding angle, and 5.6 foot-degrees applies between 30° and 40°.
Cited:46 CFR §28.570
Drill more Vessel stability — metacentric height, free surface questions
Every CaptainsGround answer cites the rule it tests — verified, not guessed. Try a free 5-question drill, no sign-up.
More practice questions
- Under 46 CFR Part 28, what is the minimum initial metacentric height (GM) required for …
- According to 46 CFR Part 28, downflooding is defined as the entry of seawater through o…
- When calculating free surface effects for stability purposes under 46 CFR Part 28, how …
- A fishing vessel operating north of 42°N latitude between November 15 and April 15 must…
- Under 46 CFR §28.545, when a fishing vessel uses lifting gear, the angle of intersectio…
- According to the Inland Navigation Rules, a vessel aground shall exhibit, in addition t…