Navigation / Буклеты / VLCC_2_BALLAST
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VLCC 2 (Dis.127691t) bl. , v20-3D |
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Terms used |
Wheel over position (W/O) |
The point at which the change of course is initiated. |
Advance |
The distance which the ship has moved in the |
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direction of the initial heading. |
Transfer |
The distance which the ship has moved perpendicular |
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to the initial heading. |
Tactical diameter |
Transfer at 180° change of heading. |
The information contained herein is proprietary to Transas Marine (UK) Ltd and Navis Co. and shall not be duplicated, used, or disclosed in whole or part for any functional other than to evaluate this quotation.
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VLCC 2 (Dis.127691t) bl. , v20-3D
2.2.Turning circles in deep water
Full Sea Ahead
Advance, cbls |
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4 |
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2 min 9 s |
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8.9 knots |
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3 |
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5 min 19 s |
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5.2 knots |
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2 |
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1 |
13 min 32 s |
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3.7 knots |
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9 min 17 s |
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4.0 knots |
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17.1 knots |
0 |
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4 |
Transfer, cbls |
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-1 |
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Maximum rudder angle used throughout turn
Tactical diameter: 4.8 cbls
Transfer at 90° : 1.9 cbls
Advance at 90° : 3.9 cbls
Environmental conditions during Manoeuvring Trial
Wind direction |
Wind speed |
Sea state |
Depth of water, m |
0.0 |
0.0 |
0.0 |
1000 |
The information contained herein is proprietary to Transas Marine (UK) Ltd and Navis Co. and shall not be duplicated, used, or disclosed in whole or part for any functional other than to evaluate this quotation.
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VLCC 2 (Dis.127691t) bl. , v20-3D
2.3.Accelerating turn
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Advance, cbls |
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2 |
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1.5 |
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1 |
5 min 24 s |
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2.5 knots |
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10 min 25 s |
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0.5 |
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3.0 knots |
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0 |
0.0 knots |
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-1 |
-0.5 |
0.5 |
1 |
1.5 |
2 |
2.5 |
3 |
3.5 |
Transfer, cbls |
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-0.5 |
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20 min 7 s |
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3.2 knots |
-1 |
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15 min 18 s |
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3.1 knots |
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-1.5 |
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-2 |
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-2.5 |
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Maximum rudder angle used throughout turn
Full Ahead ordered
Tactical diameter: 2.6 cbls
Transfer at 90° : 0.6 cbls
Advance at 90° : 1.2 cbls
Environmental conditions during Manoeuvring Trial
Wind direction |
Wind speed |
Sea state |
Depth of water, m |
0.0 |
0.0 |
0.0 |
1000 |
The information contained herein is proprietary to Transas Marine (UK) Ltd and Navis Co. and shall not be duplicated, used, or disclosed in whole or part for any functional other than to evaluate this quotation.
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VLCC 2 (Dis.127691t) bl. , v20-3D
2.4.Yaw checking test
Zigzag (or Kempf) manoeuvre
The manoeuvre provides a qualitative measure of the effectiveness of the rudder to initiate and check changes of heading.
The manoeuvre is performed in the following manner. With the ship steaming at a uniform speed and on a constant heading a nominal rudder angle, say 20 degrees, is applied as quickly and as smoothly as possible and held constant until the ships heading has changed by 20 degrees (check angle) from the base course. At this point 20 degrees of opposite rudder is applied and held until the ship’s heading has crossed the base course and is 20 degrees in the opposite direction, the rudder is then reversed as before. This procedure is repeated until the ship’s head has passed through the base course 5 times. During the manoeuvre the ship’s heading and rudder angle are recorded continuously.
Zigzag (or Kempf) Manoeuvre: Ship’s Heading and Rudder Angle against Time
Heading, deg |
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Rudder, deg |
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20 |
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Port |
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10 |
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0 |
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Time, s |
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100 |
200 |
300 |
400 |
500 |
600 |
700 |
800 |
10 |
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Stbd |
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20 |
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30 |
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Rudder angle |
20 |
deg |
Initial speed |
17.1 kts |
Check angle |
20 |
deg |
Full Sea Ahead |
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Swing time |
83 |
s |
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Overshoot time |
44 |
s |
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Overshoot angle |
11 |
deg |
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Period |
317 |
s |
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The information contained herein is proprietary to Transas Marine (UK) Ltd and Navis Co. and shall not be duplicated, used, or disclosed in whole or part for any functional other than to evaluate this quotation.
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VLCC 2 (Dis.127691t) bl. , v20-3D
Terms used
Zigzag (or Kempf) manoeuvre
The information contained herein is proprietary to Transas Marine (UK) Ltd and Navis Co. and shall not be duplicated, used, or disclosed in whole or part for any functional other than to evaluate this quotation.
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VLCC 2 (Dis.127691t) bl. , v20-3D
Pull out manoeuvre
The pull out manoeuvre was developed as a simple test to give a quick indication of a ship’s course stability. The ship is held on steady course and at a steady speed. A rudder angle of approximately 20 degrees is applied and the ship allowed to achieve a steady rate of turn; at this point the rudder is returned to midships. If the ship is stable the rate of turn will decay to zero for turns to both port and starboard. If the ship has a steering bias, then port and starboard turns will decay to the same small rate of turn on whichever hand the bias exists. If the ship is unstable then the rate of turn will reduce to some residual rate of turn.
Rate of turn |
20 |
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deg/min |
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15 |
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10 |
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Port |
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5 |
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0 |
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Time, s |
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200 |
400 |
600 |
800 |
1000 |
1200 |
1400 |
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5 |
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Stbd |
10 |
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15 |
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20 |
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Initial speed 17.1 kts
Unstable Ship
Full Sea Ahead
Rudder at zero time returned to CLP
The information contained herein is proprietary to Transas Marine (UK) Ltd and Navis Co. and shall not be duplicated, used, or disclosed in whole or part for any functional other than to evaluate this quotation.
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VLCC 2 (Dis.127691t) bl. , v20-3D
2.5.Man-overboard and parallel course manoeuvres
Williamson Turn shown (Full Sea Ahead)
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cbls |
8 |
cbls |
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8 |
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10 min 25 s |
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7 |
7 |
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10 min 22 s |
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AutoPilot turned ON |
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AutoPilot turned ON |
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6 |
6 |
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5 |
5 |
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4 |
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3 |
3 |
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1 min 45 s |
2 |
2 |
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1 min 45 s |
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80 deg |
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80 deg |
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1 |
1 |
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0 |
0 |
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cbls |
-5 |
-4 |
-3 |
-2 |
-1 |
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1 |
2 |
3 |
4 |
5 |
cbls |
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-1 |
-1 |
18 min 43 s |
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18 min 44 s |
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Initial Speed 17.1 knots |
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Forward reach: |
7.99 cbls |
Forward reach: |
7.97 cbls |
Lateral transfer: |
5.65 cbls |
Lateral transfer: |
5.62 cbls |
Lateral shift: |
0.14 cbls |
Lateral shift: |
0.09 cbls |
Parallel course manoeuvre (Full Sea Ahead)
The information contained herein is proprietary to Transas Marine (UK) Ltd and Navis Co. and shall not be duplicated, used, or disclosed in whole or part for any functional other than to evaluate this quotation.
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VLCC 2 (Dis.127691t) bl. , v20-3D
Advance, cbls 
4
3 |
Elapsed time 4 min 30 s |
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AutoPilot turned ON |
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2 |
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Elapsed time 7 min 7 s
Initial Speed 17.1 knots |
0 |
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1 |
2 |
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Transfer, cbls |
-1
The information contained herein is proprietary to Transas Marine (UK) Ltd and Navis Co. and shall not be duplicated, used, or disclosed in whole or part for any functional other than to evaluate this quotation.
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VLCC 2 (Dis.127691t) bl. , v20-3D
Terms used
Williamson Turn shown
Parallel course manoeuvre
The information contained herein is proprietary to Transas Marine (UK) Ltd and Navis Co. and shall not be duplicated, used, or disclosed in whole or part for any functional other than to evaluate this quotation.
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VLCC 2 (Dis.127691t) bl. , v20-3D
3. STOPPING AND SPEED CONTROL CHARACTERISTICS IN DEEP WATER
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3.1.Stopping ability |
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Track reach, |
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n.miles |
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19-35 -0.0 |
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2.5 |
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15-02 |
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4.8 |
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18-34 -0.0 |
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2 |
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10-08 |
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7.6 |
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11-42 |
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6.0 |
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1.5 |
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6-43 |
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10.1 |
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7-34 |
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8.6 |
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1 |
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4-03 |
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12.6 |
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4-31 |
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11.1 |
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0.5 |
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1-51 |
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14.9 |
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2-04 |
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13.4 |
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0-00 |
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17.1 |
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0-00 |
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15.8 |
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min-s |
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knots |
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min-s |
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knots |
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Full Sea Ahead |
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Full Ahead |
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to |
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Full Astern |
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Full Astern |
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From Full Sea Ahead to Full Astern |
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Initial rpm |
Final rpm |
Initial |
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Final |
Track |
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Head |
Side |
Final |
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Speed, |
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Speed, |
reach, |
reach, |
reach, |
course, |
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knots |
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knots |
n.miles |
n.miles |
n.miles |
deg |
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78.00 |
-52.88 |
17.1 |
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0.0 |
2.703 |
2.702 |
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0.03102 |
5 |
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From Full Ahead to Full Astern |
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Initial rpm |
Final rpm |
Initial |
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Final |
Track |
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Head |
Side |
Final |
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Speed, |
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Speed, |
reach, |
reach, |
reach, |
course, |
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knots |
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knots |
n.miles |
n.miles |
n.miles |
deg |
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72.00 |
-52.89 |
15.8 |
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0.0 |
2.411 |
2.411 |
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0.02998 |
4 |
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The information contained herein is proprietary to Transas Marine (UK) Ltd and Navis Co. and shall not be duplicated, used, or disclosed in whole or part for any functional other than to evaluate this quotation.
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