arrive at a decision as to the amount of freeboard. My personal experience favours 6V2 

 per cent of the length as a good standard, although it is realized that some ocean-going 

 ships have a smaller ratio. Exceptional standards were aimed at for H. M. Yacht 

 BRITANNIA and the freeboard coefficient was finally determined at about 8 per cent 

 following a series of model tests. Perhaps the Author would comment on these figures 

 and say whether he is aware of any theoretical or empirical rule to guide the designer 

 in this vital problem. One empirical approach which has been attempted at Haslar is 

 represented by the diagram herewith, which is self-explanatory. Experience to date 

 indicates that curves as shown on the diagram fairly well differentiate between dry 

 and wet ships. (See Fig. 1.) 



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 UJ 



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TUNING FACTOR 



P. Golovato 



Dr. Weinblum has mentioned recent work at the Taylor Model Basin on the 

 forces and moments on oscillating ship forms. I would like to elaborate on his remarks 

 and summarize the principle results of this continuing investigation. 



We at the model Basin are indebted to Dr. Weinblum for the foundations he 

 laid for this work while he was with us several years ago. The very test facility and 

 model we have utilized were originally built for Dr. Weinblum's use. 



We have constrained a ship model with fore-and-aft symmetry to oscillate 



100 



