Wave Cut Tests to Optimize Hull Form Changes
WEBB INST OF NAVAL ARCHITECTURE GLEN COVE NY
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Research was continued in the towing tank at Webb Institute using the established XY wave survey method for determining ship model wave resistance from measurements of the force exerted on a stationary vertical cylinder by the waves produced by the model. The hull form used was the Maritime Administration Security Class Multi-Purpose Mobilization Ship MMS. New results using this technique showed that a a Kawasaki-type stern bulb caused a small saving 7 of wave energy b a suggested vertically distributed bow bulb area was not better than the originally designed elliptical distribution and c a newly developed two-change optimization theory included in the text was valid and that the predicted bow buld-Station 4 protuberance combination was in fact beneficial. The large percentage about 67 saving in wave resistance caused by these additions does not seem to be identifiable by simply comparing the wave signals by eye. Tests to assess the possible adjustment of the above wave resistance savings to those of wave power by including the effect of average wake values in the propellant disc were made. It is concluded that such changes were not significant for the present model and bulbs.
- Marine Engineering