5. DUTTON'S NAUTICAL NAVIGATION

Question 1

reference

Answer 1

dutton’s cha 14

Question 2

define handling characteristics

Answer 2

the ways a vessel responds to engine and rudder orders

Question 3

for naval vessels handling characteristics are called ___

Answer 3

tactical characteristics

Question 4

to obtain tactical data for US Navy Ships

Answer 4

NPW 50-A

Question 5

define pivot point

Answer 5

the point about who the vessels turns when her rudder is put over.

Question 6

How do pivot points move?

Answer 6

typically aft when slowing and more aft when backing

Question 7

Define turning circle.

Answer 7

the path inscribed by the vessel’s longitudinal center of gravity in making a turn of 360 deg

Question 8

Define advance

Answer 8

the distance gained in the original direction until the vessel steadies on her new course; it is measured from the point at which the rudder is put over

The advance

Question 9

Define transfer

Answer 9

the distance gained at right angles to the original course, measured from the line repsresenting the original direction to the point of completion of the turn. T

transfer is maximized at 180 degrees

Question 10

Define tactical diameter.

Answer 10

the distance gained to the right or left of the original course when a turn of 180 degrees has been completed

Question 11

Define Final Diameter

Answer 11

the distance perpendicular to the original course between tangents drawn at the points where 180 and 360 degrees of the turn have been completed.

Should the ship continue turning indefinitely with the same speed and rudder, she will keep on turning in a circle of this diameter. It will nearly always be less than the tactical diameter.

Question 12

Define standard tactical diameter

Answer 12

a specific distance chosen to be uniform for naval vessels of a particular type.

Question 13

Define standard rudder.

Answer 13

the amount of rudder angle necessary to cause the ship to turn in the standard tactical diameter at standard speed

Question 14

Define Angle of Turn

Answer 14

the arc, measured in degrees through which the ship turn from the original course to the final course

Question 15

How does speed-length ratio work?

Answer 15

a 300 foot ship at 30 knots has a considerably larger turning circle than at 15 kts.

Question 16

Define approach track

Answer 16

the track that a vessel must make good in order to arrive at the center o her assigned berth

Question 17

Letting-go bearing

Answer 17

is a bearing to any convenient landmark from the point of intersection of the letting-go circle and the final approach track. should be near the beam to maximize effectivness

Question 18

Define letting-go point

Answer 18

intersection of the approach track and the letting-go circle

Question 19

Define Range circles

Answer 19

distance circles of varying radii plotted from the center of the berth with distances measured from the letting-go circle.

Question 20

Define letting-go circle

Answer 20

the radius o fetch circle is equal to the horizontal distance form the point of th vessel where than anchor will be let go (the hawsepipe) to the point where th instrument that will be used in taking bearings is located.

So, hawespipe to peolorus

Question 21

Define swing circle.

Answer 21

a radius equal to the ship’s length plus the horizontal companion of the long o anchor cable to be used is plotted.

Question 22

Define drag circle.

Answer 22

using the actual anchor position as the center and the horizontal component of the anchor cable length plus the letting-go circle distance as the radius