Swaan and Wahab 

 Table 1 



simulated. The forward speed of the model was provided by the towing carriage. 

 The connection between the model and the towing carriage consisted of an appa- 

 ratus which left the model free to heave, pitch and roll. It enabled the measure- 

 ment of these motions by means of potentiometers. The resistance, lateral 

 force and yawing moment were determined by means of strain gauge balances. 

 Model and towing apparatus are shown in Figs. 2 and 3. 



During the tests the weight distribution corresponded with the conditions of 

 the actual which is shown in Table 1. 



THE TEST PROGRAM 



The purpose of the investigations was to get an insight into the behaviour 

 and the forces working on the vehicle when proceeding over smooth water of 

 various depths and over waves. The tests conducted may be divided into the 

 following categories. 



694 



