Sail Course®

Part 2, Forces

7 Stability

8 Balance

9 Wind

10 Sail Shape

11 Preparing to Sail

Sail Course®

Section 7, Stability

Sail Course®

Figure 7–1 Center of Gravity

Sail Course®

Figure 7–2 Center of Buoyancy

Sail Course®

Figure 7–3 Righting Moment

Sail Course®

Figure 7–4 Righting Arm

Sail Course®

Figure 7–5 Righting Arm

Sail Course®

Figure 7–6 Lowering Center of Gravity

Sail Course®

Figure 7–7 Effect of Hull Form

Sail Course®

Figure 7–8 Catamaran Stability

Sail Course®

Figure 7–9 Wind Pressure and Heeling

Sail Course®

Figure 7–10 Hiking Out

Sail Course®

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.

Sail Course®

End of Section 7 Slides