Abstract
ABSTRACT A hybrid craft is defined as a combination of different lifting surfaces. The lift force can be of aerodynamic or hydrodynamic character. This research deals with the conditions of using planing mono-hulls equipped with a couple of wings, called planing-wing hybrid craft. A parametric study is conducted by using Vortex Lattice Method to determine feasibility of using an aerodynamic wing mounted to planing craft. It has been determined that the wing area should be more than twice as much as the wetted surface of the craft, to get an effective wing for planing craft. Furthermore, the wing should be so designed as to obtain its high aspect ratio. Maximum lift force contribution resulting from different wing configurations considered in this study is less than 35 percent of the total hydrodynamic lift force at an arbitrary condition. On this basis it may be concluded that the wing may be effectively used only in special conditions, hence this is not recommended for general application.
Highlights
People are always looking for increasing productivity and improving performance of transportation
A typical hybrid craft was analyzed to examine the conditions in which aerodynamic lift force of wing is beneficial for planing mono-hull
A typical planing body fitted with wings of different dimensions proportional to the main dimensions of the craft, was considered
Summary
People are always looking for increasing productivity and improving performance of transportation. The objective of this paper is to examine performance of one kind of such crafts, namely the planing-wing hybrid craft in which hydrodynamic and aerodynamic lift forces mainly supports the craft’s weight at service speed. Due to higher density and viscosity of water than air, large speed of a body in water causes its frictional and wave-making resistance greater than in case of moving in air. One solution to reduce this type of resistance is reducing the wetted surface of craft. Lifting surfaces produce a higher lift force and reduce craft’s draught but they may cause some detrimental effects such as cavitation of hydrofoils, degradation of craft’s performance in waves, reduction of its stability etc. The restrictions may put obstacles on increasing the craft speed
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