Velocity to Wind

Inputs

Enter angle of the wind:	deg
Flag spacing:	deg
Enter flag width:	deg
Enter tail width:	deg
Apparent Wind Speed:
Boat Speed

Computations

True Wind Direction	43.2°
VMG to wind	3.65
True Wind Speed	11
AWS / BS	3

AWD/BS	TWD	Coeff	TWS/AWS
6.58	35	0.819	0.87
5.62	36	0.809	0.85
4.94	37	0.799	0.83
4.42	38	0.788	0.81
4.02	39	0.777	0.79
3.7	40	0.766	0.78
3.44	41	0.755	0.76
3.22	42	0.743	0.75
3.03	43	0.731	0.73
2.87	44	0.719	0.72
2.73	45	0.707	0.71
2.61	46	0.695	0.7
2.5	47	0.682	0.68
2.4	48	0.669	0.67
2.32	49	0.656	0.66
2.24	50	0.643	0.65
2.17	51	0.629	0.64
2.1	52	0.616	0.63
2.04	53	0.602	0.63
1.99	54	0.588	0.62
1.94	55	0.574	0.61
1.89	56	0.559	0.6
1.85	57	0.545	0.6
1.81	58	0.53	0.59
1.77	59	0.515	0.58
1.73	60	0.5	0.58
1.7	61	0.485	0.57
1.67	62	0.469	0.57
1.64	63	0.454	0.56
1.61	64	0.438	0.56
1.58	65	0.423	0.55
1.55	66	0.407	0.55
1.53	67	0.391	0.54
1.51	68	0.375	0.54
1.48	69	0.358	0.54
1.46	70	0.342	0.53
1.44	71	0.326	0.53
1.42	72	0.309	0.53
1.4	73	0.292	0.52
1.38	74	0.276	0.52
1.37	75	0.259	0.52
1.35	76	0.242	0.52
1.33	77	0.225	0.51
1.32	78	0.208	0.51
1.3	79	0.191	0.51

Instructions

1. Sail the boat to match the masthead position or apparent wind angle shown on this page.
2. Record the boat speed and apparent wind speed.
3. Divide the apparent wind speed by the boat speed. That is AWS/BS. For example, if the boat is going 6 knots and the apparent wind is 16 knots that would be 2.67
4. Using that number, look up the Coeff in the table which would be 0.7 for the example above.
5. Multiply the Boat Speed by the Coeff. That is the VMG to Wind. (4.2 for our example.)
6. Plot the VMG to Wind on the Y axis with the Angel of the wind (AWD).
7. Plot points for several wind directions and draw a smooth curve through them. The peak is the target wind angle.
8. Use a plot of the boat speed on the same X axis to find the boat speed at the target wind angle. That is the target boat speed.
9. Optionally, multiply the apparent wind by the TWS/AWS to get the true wind speed. Your TWS shoud be the same for all your points.

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