LAMBOLEY TEST OF EC-12 MODEL YACHTS

Comparative evaluations were conducted using a Lamboley pendulum test to determine the radius of gyration in the pitch axis and to locate th e center of gravity of the East Coast 12-Meter (EC-12M) model sail yac hts. The Lamboley simultaneous equations were solved using a computer programmed for this purpose. From these data, the righting moment at 2 0 deg heel and the moment of inertia in the pitch axis, without the ri g, were calculated and plotted. Critical pitching frequencies were cal culated, assuming a nominal mast and rig; and critical wavelengths wer e calculated and plotted versus boat speed.