SELKIE JOHNKA — ORC Rating

GPH

581.7

OSN

564.5

LOA

11.606 m

Displacement

6443 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.7078

Medium

0.9506

High

1.0945

Triple Offshore

Low

0.9093

Medium

1.16

High

1.2986

Boat Specifications

Dimensions

Length overall: 11.606 m
Beam: 3.82 m
Draft: 2.45 m
Displacement: 6443 kg
Crew weight: 760 kg
Wetted surface: 30.73 m²

Sails

Mainsail: 50.36 m²
Genoa: 38.08 m²
Spinnaker: 112.75 m²
Asymmetric spinnaker: 109.3 m²

Design

Type: PRIMA 38
Builder: SEAQUEST YACHTS
Designer: STEPHEN JONES
Year built: 1998

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.

6,42.3,5.191777,52,5.79,60,6.08,75,6.27,90,6.13,110,6.11,120,5.92,135,5.29,140.8,4.955194,150,4.43
8,40,6.070144,52,6.79,60,7.01,75,7.16,90,7.15,110,7.25,120,7.11,135,6.55,146.4,5.834885,150,5.61
10,38.4,6.584207,52,7.31,60,7.48,75,7.61,90,7.67,110,7.83,120,7.75,135,7.39,148.9,6.691837,150,6.62
12,37.2,6.829624,52,7.57,60,7.74,75,7.91,90,7.95,110,8.25,120,8.22,135,7.91,150,7.36,156.7,7.044505
14,36.5,6.941534,52,7.71,60,7.9,75,8.14,90,8.23,110,8.63,120,8.66,135,8.37,150,7.86,166.4,7.284243
16,36.2,7.03876,52,7.8,60,8.01,75,8.32,90,8.5,110,8.92,120,9.1,135,8.85,150,8.29,177.2,7.619096
20,35.9,7.147781,52,7.91,60,8.15,75,8.56,90,8.92,110,9.38,120,9.93,135,9.98,150,9.22,178.1,8.444643
24,36.4,7.20592,52,7.96,60,8.22,75,8.71,90,9.22,110,9.69,120,10.64,135,12.12,150,10.48,176.8,9.324539

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	5.79	6.08	6.27	6.13	6.11	5.92	5.29	4.43
8	6.79	7.01	7.16	7.15	7.25	7.11	6.55	5.61
10	7.31	7.48	7.61	7.67	7.83	7.75	7.39	6.62
12	7.57	7.74	7.91	7.95	8.25	8.22	7.91	7.36
14	7.71	7.9	8.14	8.23	8.63	8.66	8.37	7.86
16	7.8	8.01	8.32	8.5	8.92	9.1	8.85	8.29
20	7.91	8.15	8.56	8.92	9.38	9.93	9.98	9.22
24	7.96	8.22	8.71	9.22	9.69	10.64	12.12	10.48

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	42.3°	3.84	140.8°	3.84
8	40°	4.65	146.4°	4.86
10	38.4°	5.16	148.9°	5.73
12	37.2°	5.44	156.7°	6.47
14	36.5°	5.58	166.4°	7.08
16	36.2°	5.68	177.2°	7.61
20	35.9°	5.79	178.1°	8.44
24	36.4°	5.8	176.8°	9.31

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