The product of this collaboration is a unique hull form that combines the low-speed efficiency of a full displacement motoryacht with the maximum speed associated with a semi-displacement vessel.

A semi-analytical method with no assumption of stress and displacement is developed, in which the thickness of shell is not restricted and the uniform distribution of springs is not needed.

Based on the elastic semi-plane stress solution of the semicircular excavation and rectangle excavation, deducing the soil displacement equation around the foundation pit.