sail course ® part 2, forces 7stability 8balance 9wind 10sail shape 11preparing to sail

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Part 2, Forces

7 Stability

8 Balance

9 Wind

10 Sail Shape

11 Preparing to Sail

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Section 7, Stability

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Figure 7–1 Center of Gravity

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Figure 7–2 Center of Buoyancy

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Figure 7–3 Righting Moment

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Figure 7–4 Righting Arm

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Figure 7–5 Righting Arm

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Figure 7–6 Lowering Center of Gravity

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Figure 7–7 Effect of Hull Form

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Figure 7–8 Catamaran Stability

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Figure 7–9 Wind Pressure and Heeling

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Figure 7–10 Hiking Out

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Vocabulary

Center of Buoyancy The center of gravity of the water displaced by a floating boat.

Heel. Incline to one side due to force of wind or waves.

Lever Arm The distance through which a force acts.

List Inclination of a boat to one side due to weight distribution.

Moment. A force acting through a distance that tends to cause rotation.

Pitching Oscillation around the transverse axis; the rising and falling of the bow in waves.

Righting Arm Horizontal distance between the vertical line through the center of buoyancy and the vertical line through the

center of gravity.

Righting Moment The righting arm multiplied by the yacht’s displacement.

Rolling Oscillation of a boat around a longitudinal axis.

Yaw To swing off course due to wave action or bad steering, usually to one side and then the other.

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End of Section 7 Slides