초록 ▼

An hydrofoil assembly for small craft is disclosed. The assembly includes two hydrofoils independently mounted on a boat or a propulsion unit of the boat\s motor for free pivotal movement between a depending position and a extended in-use position. The foils automatically adopt the in-use position d

An hydrofoil assembly for small craft is disclosed. The assembly includes two hydrofoils independently mounted on a boat or a propulsion unit of the boat\s motor for free pivotal movement between a depending position and a extended in-use position. The foils automatically adopt the in-use position during forward movement and drop to their depending positions whenever their angle of attack becomes negative, such as in reverse movement when pivoted up to clear an obstacle, or when the boat is stationary.

대표청구항 ▼

An hydrofoil assembly comprising: a pair of hydrofoils, and mounting structure for attaching said hydrofoils to a boat such that in an operative condition said hydrofoils are disposed below the working water line of the boat, said mounting structure defining a pivotal mounting for each hydrofoil abo

An hydrofoil assembly comprising: a pair of hydrofoils, and mounting structure for attaching said hydrofoils to a boat such that in an operative condition said hydrofoils are disposed below the working water line of the boat, said mounting structure defining a pivotal mounting for each hydrofoil about a respective pivot axis which in the operative condition is disposed in a generally fore-and-aft orientation, each hydrofoil being pivotable between a retracted position projecting downwardly from the respective pivot axis and an extended position projecting substantially laterally from the associated pivot axis and means preventing each said foil from pivoting upwardly beyond said extended position, each said hydrofoil in the operative condition having a positive angle of attack with respect to the surrounding water such that in forward motion of the boat the water reacts with the hydrofoil to urge it towards said extended position, said mounting structure being adapted to be connected to the boat to be pivotable about a transverse axis and displaceable rearwardly and upwardly from said operative condition upon encounter with an underwater obstacle, such displacement altering the attitude of said hydrofoils so that said angle of attack becomes negative and the reaction of the water urges the hydrofoils to the retracted position.