Boat Characteristics and Stability

Question 1

Highest points on 47

Answer 1

Fixed: 18’6” at radar antenna
Unfixed: 28’4” HF antenna

Question 2

Draft

Answer 2

4’6”

Question 3

Freeboard

Answer 3

Bow: 6’8”
Amidships: 2’2” (recess)
Aft: 7’1”

Question 4

Two types of stability

Answer 4

Longitudinal and transverse

Question 5

Forces that affect stability

Answer 5

Static and dynamic

Question 6

Watertight integrity

Answer 6

Holes/cracks in watertight structure, scuttle, or hatch
Failure of a watertight closure to seal, greater than 10%
Any noticeable gap at gasket seams

Question 7

Through hull fittings

Answer 7

11 total
2 rudder posts in Laz
2 strut shaft extensions in engine room
Sea suction
Firefighting standpipe
2 packless shaft seals in survivors
transducer port survivors
speedometer stbd survivors
raw water intake aux

Question 8

Effects of cavitation

Answer 8

The formation of a partial vacuum around the propeller blades. prop is spinning through air which causes boat to be less responsive

Question 9

Propeller slip

Answer 9

Propeller is undergoing cavitation, slipping on the air bubbles and not getting traction through the water