Fatmai: ORC Rating

GPH

706.7

OSN

688.2

LOA

10.5 m

Displacement

3700 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.5984

Medium

0.7784

High

0.8744

Triple Offshore

Low

0.761

Medium

0.9507

High

1.0359

Boat Specifications

Dimensions

Length overall: 10.5 m
Beam: 2.3 m
Draft: 1.6 m
Displacement: 3700 kg
Crew weight: 420 kg
Wetted surface: 18.96 m²

Sails

Mainsail: 21.76 m²
Genoa: 28.61 m²
Spinnaker: 64.41 m²
Asymmetric spinnaker: 0 m²

Design

Type: Botnia 6
Builder: Tyvex
Designer: G. L. Stenback
Year built: 1970
Stability index: 151.2

Performance data

Polar CSV

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

6,41.8,4.305974,52,4.82,60,5.03,75,5.17,90,5.05,110,5.07,120,4.93,135,4.48,146.6,3.976772,150,3.84
8,39.9,4.953301,52,5.56,60,5.75,75,5.9,90,5.86,110,6,120,5.92,135,5.51,150,4.84,151.1,4.786031
10,39.6,5.30815,52,5.94,60,6.13,75,6.3,90,6.32,110,6.49,120,6.49,135,6.24,150,5.69,153.2,5.545685
12,39.4,5.461132,52,6.1,60,6.31,75,6.52,90,6.6,110,6.77,120,6.82,135,6.68,150,6.3,160.4,5.933821
14,39.3,5.556703,52,6.19,60,6.39,75,6.64,90,6.78,110,6.92,120,7.07,135,7.01,150,6.7,173.6,6.168442
16,39.4,5.616425,52,6.24,60,6.44,75,6.71,90,6.91,110,7.05,120,7.26,135,7.31,150,7.02,178.1,6.553603
20,40,5.678522,52,6.29,60,6.5,75,6.79,90,7.05,110,7.21,120,7.52,135,7.87,150,7.62,178.4,7.162793

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.82	5.03	5.17	5.05	5.07	4.93	4.48	3.84
8	5.56	5.75	5.9	5.86	6	5.92	5.51	4.84
10	5.94	6.13	6.3	6.32	6.49	6.49	6.24	5.69
12	6.1	6.31	6.52	6.6	6.77	6.82	6.68	6.3
14	6.19	6.39	6.64	6.78	6.92	7.07	7.01	6.7
16	6.24	6.44	6.71	6.91	7.05	7.26	7.31	7.02
20	6.29	6.5	6.79	7.05	7.21	7.52	7.87	7.62

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	41.8°	3.21	146.6°	3.32
8	39.9°	3.8	151.1°	4.19
10	39.6°	4.09	153.2°	4.95
12	39.4°	4.22	160.4°	5.59
14	39.3°	4.3	173.6°	6.13
16	39.4°	4.34	178.1°	6.55
20	40°	4.35	178.4°	7.16

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°	4.82	5.56	5.94	6.10	6.19	6.24	6.29
60°	5.03	5.75	6.13	6.31	6.39	6.44	6.50
75°	5.17	5.90	6.30	6.52	6.64	6.71	6.79
90°	5.05	5.86	6.32	6.60	6.78	6.91	7.05
110°	5.07	6.00	6.49	6.77	6.92	7.05	7.21
120°	4.93	5.92	6.49	6.82	7.07	7.26	7.52
135°	4.48	5.51	6.24	6.68	7.01	7.31	7.87
150°	3.84	4.84	5.69	6.30	6.70	7.02	7.62