are anticipated, where the number of blades determines the pertinent 

 harmonics of blade loading. However, the data are not sufficient to 

 quantify the modulations of bearing loads due to hull pitching and waves 

 nor to provide guidance for predicting these modulations. 



Trends of the results for both blade loads and bearing loads are 

 consistent with available full-scale data. 



VI. ACKNOWLEDGMENTS 



The authors are indebted to many members of the staff of the David 

 W. Taylor Naval Ship Research and Development Center. Special appreci- 

 ation is extended to Messrs. Michael Jeffers, Benjamin Wisler, and 

 Douglas Dahmer for development of the on-line data analysis sytem, 

 assembling the servomechanism for accurately controlling the model 

 pitching relative to the waves, assisting in running the experiments, 

 and analyzing data. 



VII. REFERENCES 



Boswell, R. J., and M. L. Miller (1968), Unsteady Propeller Loading - 

 Measurement, Correlation with Theory, and Parametric Study, NSRDC 

 Rept 2625. 



Boswell, R. J., J. J. Nelka, and S. B. Denny (1976). Experimental 

 Determination of Mean and Unsteady Loads on a Model CP Propeller 

 Blade for Various Simulated Modes of Ship Operation, Eleventh Sym- 

 posium on Naval Hydrodynamics, Mechanical Engineering Publications 

 Limited, London and New York, pp. 789-834. 



Boswell, R. J., J. J. Nelka, and S. B. Denny (1976). Experimental 



Unsteady and Mean Loads on a CP Propeller Blade on the FF-1088 for 

 Simulated Modes of Operation, DTNSRDC Rept 76-0125, DTIC ADA 

 034804. 



Boswell, R. J., S. D. Jessup, and J. J. Nelka (1978). Experimental Time 

 Average and Unsteady Loads on the Blades of a CP Propeller Behind a 

 Model of the DD-963 Class Destroyer, Propellers '78 Symposium , The 

 Society of Naval Architects and Marine Engineers Publication S-6, 

 pp. 7/1-7/28. 



Boswell, R. J., S. D. Jessup, and K. H. Kim (1981). Periodic Blade 



Loads on Propellers in Tangential and Longitudinal Wakes, Propellers 

 '81 Symposium , The Society of Naval Architects and Marine Engineers 

 Publication S-8, also DTNSRDC Rept 81/054. 



Brandau, J. H. (1968). Static and Dynamic Calibration of Propeller 



Model Fluctuating Force Balances, DTMB Rept 2350, also Technologia 

 Naval , 1, pp. 48-74. 



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