DEVELOPMENT IN SAIL BOAT USING “T” SHAPED HYDROFOIL

There are various developments in the marine vehicles in various stages. One among this development is the Hydrofoil. These hydrofoils are wing like structure similar to that of the aeroplane wings. This wing like structure is fitted under the hull of the boat to levitate the hull above the surface of the water. These hydrofoils differ in size and shape according to the size of the marine vehicle. Hydrofoil is made up of light weight material so that it doesn't add more weight to the marine vehicle. This hydrofoil attached under the hull provides a lift to the vehicle travelling at a considerable speed. This lift provided by the hydrofoil facilitate reduction in the drag force, frictional force and other resisting forces prevailing during the hull in contact with the water surface. This lifting of the hull can provide increase in the speed and fuel economy. The foil which is fixed under the hull of the marine vehicle is in the form of inverted ‘T'. At a certain speed the water contacting the hydrofoil is deflected downwards through a certain angle called Attack angel. This attack angle is calculated by l/d ratio, more the value of l/d ratio provides more lift. This attack angle is responsible for the lift of the hull. This deflection causes high pressure at bottom surface and low pressure at to surface of the foil. This pressure difference is accomplished by velocity difference. The lifting force eventually balances the weight of the vehicle, so that after a certain point the hydrofoil doesn't lift out of the water and remain equilibrium. We have achieved the speed which we have aimed earlier by lifting the hull of the boat and also increased the speed of the boat up to 20%.