Morning Cloud: ORC Rating

GPH

721.2

OSN

700

LOA

9.046 m

Displacement

3450 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.6427

Medium

0.865

High

0.9896

Triple Offshore

Low

0.8192

Medium

1.0556

High

1.1749

Boat Specifications

Dimensions

Length overall: 9.046 m
Beam: 3.1 m
Draft: 1.67 m
Displacement: 3450 kg
Crew weight: 441 kg
Wetted surface: 18.3 m²

Sails

Mainsail: 18.05 m²
Genoa: 30.16 m²
Spinnaker: 61.49 m²
Asymmetric spinnaker: 0 m²

Design

Type: Shamrock 30
Builder: Southcoast Cork
Designer: R. Holland
Year built: 1975

Performance data

Polar CSV

Each row is TWS followed by TWA and boat-speed pairs. Paste it directly into Offwind or compatible navigation software.

6,41.8,4.051103,52,4.53,60,4.74,75,4.9,90,4.84,110,4.84,120,4.71,135,4.33,148.1,3.816382,150,3.74
8,40.8,4.716015,52,5.34,60,5.58,75,5.75,90,5.73,110,5.84,120,5.72,135,5.28,150,4.66,151.9,4.57984
10,41.3,5.364292,52,5.89,60,6.05,75,6.17,90,6.26,110,6.35,120,6.28,135,6.04,150,5.48,152.3,5.37614
12,39.9,5.631121,52,6.15,60,6.29,75,6.42,90,6.54,110,6.68,120,6.63,135,6.42,150,6.1,161.7,5.698183
14,39.4,5.745836,52,6.28,60,6.44,75,6.61,90,6.67,110,6.99,120,6.96,135,6.74,150,6.44,180,5.98
16,39.1,5.785736,52,6.33,60,6.52,75,6.77,90,6.87,110,7.25,120,7.28,135,7.07,150,6.73,180,6.35
20,40,5.822117,52,6.35,60,6.56,75,6.94,90,7.22,110,7.52,120,7.78,135,7.7,150,7.33,180,6.91

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.53	4.74	4.9	4.84	4.84	4.71	4.33	3.74
8	5.34	5.58	5.75	5.73	5.84	5.72	5.28	4.66
10	5.89	6.05	6.17	6.26	6.35	6.28	6.04	5.48
12	6.15	6.29	6.42	6.54	6.68	6.63	6.42	6.1
14	6.28	6.44	6.61	6.67	6.99	6.96	6.74	6.44
16	6.33	6.52	6.77	6.87	7.25	7.28	7.07	6.73
20	6.35	6.56	6.94	7.22	7.52	7.78	7.7	7.33

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	41.8°	3.02	148.1°	3.24
8	40.8°	3.57	151.9°	4.04
10	41.3°	4.03	152.3°	4.76
12	39.9°	4.32	161.7°	5.41
14	39.4°	4.44	180°	5.98
16	39.1°	4.49	180°	6.35
20	40°	4.46	180°	6.91

VPP POLAR · BOAT SPEED BY TWAKT

TRUE WIND ANGLE —

READ AT ANGLE

Hover or tap the chart, or use the slider, to read boat speeds.

True wind speed 6 kt8 kt10 kt12 kt14 kt16 kt20 kt

Data table

Boat speed by true wind angle and true wind speed
TWA	Boat speed in 6 kt (kt)	Boat speed in 8 kt (kt)	Boat speed in 10 kt (kt)	Boat speed in 12 kt (kt)	Boat speed in 14 kt (kt)	Boat speed in 16 kt (kt)	Boat speed in 20 kt (kt)
0°	0.00	0.00	0.00	0.00	0.00	0.00	0.00
52°	4.53	5.34	5.89	6.15	6.28	6.33	6.35
60°	4.74	5.58	6.05	6.29	6.44	6.52	6.56
75°	4.90	5.75	6.17	6.42	6.61	6.77	6.94
90°	4.84	5.73	6.26	6.54	6.67	6.87	7.22
110°	4.84	5.84	6.35	6.68	6.99	7.25	7.52
120°	4.71	5.72	6.28	6.63	6.96	7.28	7.78
135°	4.33	5.28	6.04	6.42	6.74	7.07	7.70
150°	3.74	4.66	5.48	6.10	6.44	6.73	7.33