DISCUSSION 131 



T. Y. Wu, California Institute of Technology, 

 Pasadena, California 



REPLY TO DISCUSSION 132 



Pao C. Pien and J. Strom-Tejsen ... 



MODEL TESTS ON CONTRAROTATING PROPELLERS 135 



J, D, van Manen and M. W. C. Oosterveld, Netherlands Ship 

 Model Basin, Wageningen, The Netherlands 



DISCUSSION 162 



Hans B. Lindgren, Swedish State Shipbuilding 

 Experimental Tank, Goteborg, Sweden 



DISCUSSION 163 



William B. Morgan, Naval Ship Research and 

 Development Center, Washington, D. C. 



DISCUSSION 163 



C. A. Johnsson, Swedish State Shipbuilding 

 Experimental Tank, Goteborg, Sweden :■;■ 



REPLY TO DISCUSSION 164 



J. D. van Manen and M. W. C. Oosterveld 



EXPERIMENTAL AND ANALYTICAL STUDIES OF PROPELLER- 

 INDUCED APPENDAGE FORCES 169 



August F. Lehman and Paul Kaplan, Oceanics, Inc., 

 Plainview, New York 



DISCUSSION 230 



R. Wereldsma, Netherlands Ship Model Basin, . . 



Wageningen, The Netherlands 



DISCUSSION 231 



Jerome H. Milgram, Massachusetts Institute of 

 Technology, Cambridge, Massachusetts 



DISCUSSION 232 



J. P. Breslin, Davidson Laboratory, Stevens 

 Institute of Technology, Hoboken, New York 



REPLY TO DISCUSSION 232 



August F. Lehman and Paul Kaplan 



THE VIBRATORY OUTPUT OF CONTRAROTATING PROPELLERS . . 235 



R. Wereldsma, Netherland Ship Model Basin, Wageningen, 

 The Netherlands 



DISCUSSION 253 



J. Strom-Tejsen, Naval Ship Research and Development 

 Center, Washington, D. C. 



REPLY TO DISCUSSION 253 



R. Wereldsma 



EXPERIMENTAL DETERMINATION OF UNSTEADY PROPELLER 



FORCES 255 



Marlin L. Miller, Naval Ship Research and Development Center, 

 Washington, D. C. 



DISCUSSION 288 



R. Wereldsma, Netherlands Ship Model Basin, 

 Wageningen, Netherlands 



REPLY TO DISCUSSION 289 



Marlin L. Miller 



THE RESPONSE OF PROPULSORS TO TURBULENCE 291 



Maurice Sevik, Ordnance Research Laboratory, the 

 Pennsylvania State University, University Park, Pennsylvania 



