Navigation_1 / Буклеты / SHUTTLE TANKER

	Shuttle tanker (Dis.152957t) , v04.1
	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
	direction of the initial heading.
Transfer	The distance which the ship has moved perpendicular
	to the initial heading.
Tactical diameter	Transfer at 180° change of heading.

The information contained herein is proprietary to Transas Marine (UK) Ltd. 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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Shuttle tanker (Dis.152957t) , v04.1

2.2.Turning circles in deep water

Full Sea Ahead

Advance, cbls
3
2.5		1 min 38 s
		11.0 knots
2
				3 min 0 s
1.5				8.8 knots
1	5 min 60 s
	7.1 knots
0.5				4 min 28 s
				7.7 knots
14.4 knots 0
0.5	1	1.5	2	2.5	Transfer, cbls
-0.5

Maximum rudder angle used throughout turn

Tactical diameter: 3.1 cbls

Transfer at 90°: 1.5 cbls

Advance at 90°: 2.8 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 shall not be duplicated, used, or disclosed in whole or part for any functional other than to evaluate this quotation.

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					Shuttle tanker (Dis.152957t) , v04.1
		2.3.Accelerating turn
	Advance, cbls
	1
	0.5	2 min 51 s
		3.9 knots
		0.0 knots	4 min 42 s
	0		4.9 knots
		0.5		1.5	2	Transfer, cbls
	-0.5		1
	8 min 12 s
	5.8 knots
	-0.5
			6 min 28 s
			5.5 knots
	-1
	-1.5

Maximum rudder angle used throughout turn

Full Ahead ordered

Tactical diameter: 1.5 cbls

Transfer at 90°: 0.5 cbls

Advance at 90°: 0.8 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 shall not be duplicated, used, or disclosed in whole or part for any functional other than to evaluate this quotation.

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Shuttle tanker (Dis.152957t) , v04.1

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
Rudder, deg	30
	20
Port
	10
	0					Time, s
	100	200	300	400	500	600
	10
Stbd
	20
	30

Rudder angle	20	deg	Initial speed	14.4 kts
Check angle	20	deg	Full Sea Ahead
Swing time	72	s
Overshoot time	31	s
Overshoot angle	14	deg
Period	244	s

The information contained herein is proprietary to Transas Marine (UK) Ltd. 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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Shuttle tanker (Dis.152957t) , v04.1

Terms used

Zigzag (or Kempf) manoeuvre

The information contained herein is proprietary to Transas Marine (UK) Ltd. 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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Shuttle tanker (Dis.152957t) , v04.1

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
deg/min	40
	30
	20
Port
	10
	0							Time, s
	100	200	300	400	500	600	700	800
	10
Stbd	20
	30
	40

Initial speed 14.4 kts

Stable Ship

Full Sea Ahead

Rudder at zero time returned to CLP

The information contained herein is proprietary to Transas Marine (UK) Ltd. 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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Shuttle tanker (Dis.152957t) , v04.1

2.5.Man-overboard and parallel course manoeuvres

Williamson Turn shown (Full Sea Ahead)

				cbls	cbls
				5	5
		5 min 14 s					5 min 14 s
	AutoPilot turned ON						AutoPilot turned ON
				4	4
				3	3
				2	2
			1 min 8 s			1 min 8 s
			60 deg	1	1	60 deg
cbls	-3	-2	-1	0	0	1	2	3	cbls
				8 min 57 s	8 min 57 s
					Initial Speed 14.4 knots

Forward reach:	5.35 cbls		Forward reach:	5.35 cbls
Lateral transfer:	3.73 cbls		Lateral transfer:	3.73 cbls
Lateral shift:	0.25 cbls		Lateral shift:	0.25 cbls
	Parallel course manoeuvre (Full Sea Ahead)
	Advance, cbls
	2.5
	2	Elapsed time 2 min 41 s
		AutoPilot turned ON
	1.5		Elapsed time 3 min 2 s
	1
	0.5
	0
Initial Speed 14.4 knots		0.5 1 1.5 2	Transfer, cbls
	-0.5

The information contained herein is proprietary to Transas Marine (UK) Ltd. 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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Shuttle tanker (Dis.152957t) , v04.1

Terms used

Williamson Turn shown

Parallel course manoeuvre

The information contained herein is proprietary to Transas Marine (UK) Ltd. 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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Shuttle tanker (Dis.152957t) , v04.1

2.6.Lateral thruster capabilities

2.6.1. Bow thruster

Zero forward speed Stop

Thruster’s power 100%

		cbls
		1
		0.5
		0
-1	-0.5	0.5	1	1.5	cbls
		17 min 36 s

-0.5

32 min 7 s

45 min 7 s -1

-1.5

-2

Effect of forward speed of turning performance (90° turn time)

Speed, knots
9
8
7
6
5
4
3
2
1
0						Time, min
11	22	33	44	55	66	77

The information contained herein is proprietary to Transas Marine (UK) Ltd. 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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Shuttle tanker (Dis.152957t) , v04.1

2.6.2. Stern thruster

Zero forward speed Stop

Thruster’s power 100%

cbls 2

1.5

16 min 5 s

1

22 min 16 s

0.5

8 min 54 s

0

-1

-0.5

0.5

1

1.5

cbls

-0.5

-1

-1.5

Effect of forward speed of turning performance (90° turn time)

Speed, knots

9
8
7
6
5
4
3
2
1
0	Time, min

3 6 9 12 15

The information contained herein is proprietary to Transas Marine (UK) Ltd. 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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