Navigation / Буклеты / LPG_1_FLOAD

	LPG 1 (Dis.33089t) , v10-3D
	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 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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LPG 1 (Dis.33089t) , v10-3D

2.2.Turning circles in deep water

Full Sea Ahead

Advance, cbls
3
		1 min 54 s
2.5		8.6 knots
2				3 min 55 s
					7.0 knots
1.5
1	8 min 8 s
	6.5 knots
0.5				6 min 1 s
				6.6 knots
14.0 knots 0
0.5	1	1.5	2	2.5	3	Transfer, cbls
-0.5

Maximum rudder angle used throughout turn

Tactical diameter: 3.5 cbls

Transfer at 90° : 1.4 cbls

Advance at 90° : 2.9 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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LPG 1 (Dis.33089t) , v10-3D

				2.3.Accelerating turn
	Advance, cbls
		1
				3 min 9 s
		0.5		4.1 knots
		0	0.0 knots			6 min 1 s
	-0.5		0.5	1	1.5	4.8 knots	2.5	Transfer, cbls
						2
		-0.5
	11 min 37 s
	5.0 knots	-1
		-1.5			8 min 49 s
					4.9 knots
		-2

Maximum rudder angle used throughout turn

Full Ahead ordered

Tactical diameter: 2.4 cbls

Transfer at 90° : 0.7 cbls

Advance at 90° : 1.0 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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LPG 1 (Dis.33089t) , v10-3D

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
Rudder, deg
	20
	15
Port	10
	5
	0											Time, s
	50	100	150	200	250	300	350	400	450	500	550	600
	5
	10
Stbd	15
	20
	25

Rudder angle	20	deg	Initial speed	14.0 kts
Check angle	20	deg	Full Sea Ahead
Swing time	61	s
Overshoot time	20	s
Overshoot angle	6	deg
Period	222	s

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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LPG 1 (Dis.33089t) , v10-3D

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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LPG 1 (Dis.33089t) , v10-3D

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
deg/min
30
20
Port
10
0										Time, s
100	200	300	400	500	600	700	800	900	1000	1100
10
Stbd
20
30

Initial speed 14.0 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 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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LPG 1 (Dis.33089t) , v10-3D

2.5.Man-overboard and parallel course manoeuvres

Williamson Turn shown (Full Sea Ahead)

			cbls
		6 min 31 s
	AutoPilot turned ON		5
			4
			3
			2
			1 min 27 s
			75 deg
			1
			0
cbls	-3	-2	-1
			10 min 57 s

Initial Speed 14.0 knots

6	cbls
		6 min 7 s
5		AutoPilot turned ON
4
3
2	1 min 25 s
	70 deg
1
0	1	2	3	cbls
10 min 35 s

Forward reach:	5.98 cbls	Forward reach:	5.91 cbls
Lateral transfer:	3.67 cbls	Lateral transfer:	3.30 cbls
Lateral shift:	0.12 cbls	Lateral shift:	0.23 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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LPG 1 (Dis.33089t) , v10-3D

Advance, cbls

2.5

	Elapsed time 3 min 27 s
2	AutoPilot turned ON

1.5

1

Elapsed time 4 min 36 s

0.5

Initial Speed 14.0 knots	0
	0.5	1	1.5	2	2.5	Transfer, cbls

-0.5

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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LPG 1 (Dis.33089t) , v10-3D

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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LPG 1 (Dis.33089t) , v10-3D

3. STOPPING AND SPEED CONTROL CHARACTERISTICS IN DEEP WATER

							3.1.Stopping ability
Track reach,
n.miles			6-20 -0.0
0.7
0.6			3-27				5.7
0.5			2-35				8.0
0.4			1-55				10.1				4-42	-0.0
0.3			1-22				11.8			2-28			4.2
0.2			0-53				12.9			1-23			6.9
0.1			0-26				13.8			0-37			9.0
0			0-00				14.0			0-00			10.2
			min-s				knots			min-s			knots
			Full Sea Ahead								Full Ahead
						to						to
				Full Astern							Full Astern
			From Full Sea Ahead to Full Astern
Initial rpm		Final rpm	Initial				Final		Track		Head				Side	Final
			Speed,				Speed,		reach,	reach,					reach,	course,
			knots				knots		n.miles	n.miles					n.miles	deg
114.00		-83.21	14.0			0.0			0.727	0.727					0.00302	4
			From Full Ahead to Full Astern
Initial rpm		Final rpm	Initial				Final		Track		Head				Side	Final
			Speed,				Speed,		reach,	reach,					reach,	course,
			knots				knots		n.miles	n.miles					n.miles	deg
85.00		-83.21	10.2			0.0			0.375	0.375					0.00197	4

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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