since u„ < at A and, according to Jin Wu's data [10], p is a maximum at 

 E m 



the center of the wake, so that p - p^ > 0. The data given in Reference 



m E — 



[8] indicate, however, that, at a section at 0.6 of the length behind the 

 stern of a ship model, u_, is zero within the accuracy of the measurements. 

 This indicates that the simpler expression (88) is suitable for computing 

 the viscous drag from wake-survey data. 



35 



