Scale effect on form drag of small waterplane area ships,withoval shape of gondola

The first systematic model series of hulls with small waterplane area was designed and tested in Krylov Shipbuilding Research Institute in the middle of the 1980’s.We design new model series of hull with oval cross section shape and test it in kowsar towing tank of shiraz. krylov series was intended to cover a broad range of Froude numbers, hull aspect ratios, design drafts, and spacing between hulls. In the present paper, these test results are analyzed by accounting for the scale effect in the form drag.Illustrative results are also given for the influence of the cross-section hull shape and strutConfiguration on theresidual resistance .Factors influencing the residual resistance of ships of this type are discussed

کلیدواژه ها:

Small waterplane area ships ، Residual resistance ، Form drag ، Scale effect