USCG Exam PracticeVessel stability — metacentric height, free surface
Under 46 CFR §28.570, what is the minimum area required under the righting arm curve between 30° and the lesser of 40° or the angle of downflooding?
- A. 16.9 foot-degrees (0.090 meter-radians)
- B. 10.3 foot-degrees (0.055 meter-radians)
- ✓ 5.6 foot-degrees (0.030 meter-radians)Correct
- D. 15.0 foot-degrees (0.080 meter-radians)
Why C is correct
46 CFR §28.570(a)(6) specifies a minimum area of 5.6 foot-degrees (0.030 meter-radians) under the righting arm curve between 30° and the lesser of 40° or the angle of downflooding. The value of 16.9 foot-degrees applies to the total area up to 40° or downflooding, and 10.3 foot-degrees applies up to 30°.
Cited:46 CFR §28.570