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APPENDIX A - TIME-VARYING PRESSURE MEASUREMENTS 

 AHEAD OF AN OPERATING PROPELLER 



During Trial 4, the time-varying pressures at the 

 head of a piezoelectric pitot tube were obtained 

 as a function of shaft position. The pressures 

 were measured for each six degrees of shaft rota- 

 tion for the pitot tube at a fixed angle. Measure- 

 ments were obtained at four angular positions of 

 the pitot tiibe and at two ship speeds. 



It should be noted that due to the fact that the 

 pitot tube is approximately one diameter of the 

 propeller forward of the propeller disk, the 

 amplitude of the pressure oscillation is only 1 per- 



cent of the mean pressure signal. Due to the 

 failure of two of the pressure transducers in the 

 head of the pitot tube, it was impossible to obtain 

 any data on the variation of the flow velocity with 

 angular position. 



During each of the runs with the piezoelectric 

 pitot tube, data were collected for a period of 

 time totalling between 5 and 10 minutes. All of 

 the data points for each angular position of the 

 shaft were then averaged to obtain a mean level for 

 each signal. Figures A-1, A-2, and A-3 show these 

 averaged pressure signals as a function of angular 

 position. Runs 209 and 205 were both obtained at 

 the same ship speed (15 knots) and shaft speed 



