@article { author = {Sajedi, S. M. and Ghadimi, P. and Sheikholeslami, M. and Ghassemi, M. A.}, title = {Comparison of hydrodynamic performance of a monohull planing vessel equipped by combined transverse step and transom wedge with a no appendage model: An experimental study}, journal = {Scientia Iranica}, volume = {28}, number = {4}, pages = {2187-2201}, year = {2021}, publisher = {Sharif University of Technology}, issn = {1026-3098}, eissn = {2345-3605}, doi = {10.24200/sci.2020.56271.4680}, abstract = {One of the most well-known strategies to eliminate or reduce the longitudinal instabilities in planing hull, is to reduce the trim of the craft. In the current study, porpoising is controlled through creating a transverse step, and the combination of adding a wedge to the stern and transverse step in the vessel. Usually, performance of stepped boats is not suitable in pre-planing regime. However, through the proposed method, stepped model performance can be improved prior to the planing regime. The investigated craft is a 2.56 m long monohull high speed model with speed range of 1,3,5,7 and 9 m/s. The obtained results indicate that best performance is acquired by the step and wedge model at the beginning of the planing regime. From 3 to 7 m/s, drag of stepped and wedged models has the lowest value and above 7 m/s and at 9 m/s, the stepped model has the lowest resistance. Among the investigated methods, using combined step and wedge indicates largest reduction in trim angle (At speeds of 3 to 9 m/s). It can therefore be concluded that model equipped by combination of wedge and step improves the poor performance of the stepped models prior to the planing regime.}, keywords = {High speed planing craft,Experimental Study,Transverse step,wedge,Porpoising}, url = {https://scientiairanica.sharif.edu/article_22077.html}, eprint = {https://scientiairanica.sharif.edu/article_22077_59b8efe3feb501d1d65043c6c64bc32d.pdf} }