Polar plots provide attainable speeds of a specific sailboat sailing at different angles to a wind of given speed. See the figure. Use the plot to approximate the attainable speed of the sailboat for the given conditions.
(a) Sailing at a 140° angle to a 6-knot wind.
(b) Sailing at a 160° angle to a 10-knot wind.
(c) Sailing at a 80° angle to a 20-knot wind.
(d) If the wind blows at 20 knots, for what angles will the sailboat attain a speed of 10 knots or faster?
(e) If the wind blows at 10 knots, what is the maximum attainable speed of the sailboat? For what angle(s) does this speed occur?

Transcribed Image Text:

60° 70° 80° 90° 100° 110°. 50% 40° 120° 130⁰* 140° 30° 150° 20⁰ 160° Wind Direction 10° +12- 21098ON COLD 3 Boat Speed (knots) 1-1- 10- 10° 20° 170° 180° 170° 160° 30° 40° 50° 150° 140° 60° -70° 130° Wind Speed .6 knots 10 knots 20 knots -80° -90° 100° 120° 110°