Figure 9 Height of Centre of Gravity
Figure 9 shows schematically the positions of the centre of buoyancy B, centre of gravity G, and metacentre M. O is a reference point on the external surface of the pontoon, and C is the point where the axis of symmetry intersects the plane of the water surface. The thickness of the material from which the pontoon is made is assumed to be 2 mm. The height of G above the reference point O is OG. The height of the jockey weight above O is yj.
With the jockey weight placed in the uppermost (top) row of the sail, the following measurements were made: Height of jockey weight above O (yj) = 322 mm
Corresponding height of G above O (OG) = 85 mm using the gravity cord
Table 3 shows the values of OG found using the gravity cord for the 5 different heights yj of the jockey weight.