Malavard 



The analog representation of these conditions is extremely simple, as can 

 be seen in Fig. 13. The law of potentials on the cavity as well as the potential 

 differences between the lower surface of the foil and the upper surface of the 

 cavity are obtained by means of potentiometers. The closure cavity condition 

 is fulfilled automatically, owing to the transformers which insured the conserva- 

 tion of the current. 



Figure 14 shows the form of the lower surface and of the cavities obtained 

 for a uniform load distribution over the foil. The configurations depend on the 

 length of the cavity and the value of the lift coefficient imposed on each foil. The 

 highest limit of Cl 2c^ is dictated by the degree of thickness tolerance which may 

 be allowed. 



Fig. 14 - Configurations of the lower surface and 

 of the cavities for a uniform load distribution 

 over the foil 



386 



