Rapketel — ORC Rating

GPH

715.3

OSN

695.9

LOA

8.99 m

Displacement

4070 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.6499

Medium

0.8717

High

0.995

Triple Offshore

Low

0.8311

Medium

1.0618

High

1.177

Boat Specifications

Dimensions

Length overall: 8.99 m
Beam: 3.1 m
Draft: 1.72 m
Displacement: 4070 kg
Crew weight: 454 kg
Wetted surface: 19.35 m²

Sails

Mainsail: 18.83 m²
Genoa: 34.15 m²
Spinnaker: 70 m²
Asymmetric spinnaker: 0 m²

Design

Type: Shamrock 30
Builder: Southcoast Boatyar
Designer: Ron Holland
Year built: 1975

Velocity Prediction

Polar CSV

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

6,41.7,4.125157,52,4.62,60,4.86,75,5.03,90,4.97,110,4.93,120,4.79,135,4.39,148,3.844122,150,3.77
8,40.5,4.760615,52,5.41,60,5.66,75,5.83,90,5.82,110,5.92,120,5.82,135,5.34,150,4.69,152.1,4.593978
10,41.2,5.40925,52,5.93,60,6.08,75,6.2,90,6.27,110,6.38,120,6.33,135,6.1,150,5.54,150.3,5.525934
12,39.9,5.657191,52,6.16,60,6.3,75,6.43,90,6.51,110,6.69,120,6.66,135,6.47,150,6.15,161.6,5.764715
14,39.1,5.747079,52,6.28,60,6.44,75,6.6,90,6.66,110,6.98,120,6.98,135,6.77,150,6.47,180,6.02
16,38.7,5.791676,52,6.34,60,6.51,75,6.75,90,6.86,110,7.2,120,7.28,135,7.09,150,6.75,180,6.37
20,39.1,5.811508,52,6.37,60,6.56,75,6.91,90,7.18,110,7.44,120,7.7,135,7.7,150,7.34,180,6.92

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.62	4.86	5.03	4.97	4.93	4.79	4.39	3.77
8	5.41	5.66	5.83	5.82	5.92	5.82	5.34	4.69
10	5.93	6.08	6.2	6.27	6.38	6.33	6.1	5.54
12	6.16	6.3	6.43	6.51	6.69	6.66	6.47	6.15
14	6.28	6.44	6.6	6.66	6.98	6.98	6.77	6.47
16	6.34	6.51	6.75	6.86	7.2	7.28	7.09	6.75
20	6.37	6.56	6.91	7.18	7.44	7.7	7.7	7.34

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	41.7°	3.08	148°	3.26
8	40.5°	3.62	152.1°	4.06
10	41.2°	4.07	150.3°	4.8
12	39.9°	4.34	161.6°	5.47
14	39.1°	4.46	180°	6.02
16	38.7°	4.52	180°	6.37
20	39.1°	4.51	180°	6.92

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