초록 ▼

The invention relates to a gas-driven pulsating water jet propulsive duct drive for watercraft with a propulsive duct which has at the front end an inlet aperture for water with a closure member closing and opening periodically by means of a drive device, is open at the rear end for ejection of wate

The invention relates to a gas-driven pulsating water jet propulsive duct drive for watercraft with a propulsive duct which has at the front end an inlet aperture for water with a closure member closing and opening periodically by means of a drive device, is open at the rear end for ejection of water and comprises at the front end a power gas outlet behind the inlet aperture. With propulsive duct drives of this kind the forward inlet aperture of the water-filled propulsive duct is periodically closed, the power gas outlet opened, in order to feed power gas under pressure into the propulsive duct and to expel the fluid filling of the propulsive duct rearwards, the power gas outlet is closed and the forward inlet aperture opened again for a fresh fluid filling.

대표청구항 ▼

A propulsive duct for driving floatable craft comprising a longitudinal housing having a substantially circular cross-section and provided with a restricted inlet opening and an outlet opening at opposed ends thereof, a longitudinal insert body disposed coaxially within said housing and spaced there

A propulsive duct for driving floatable craft comprising a longitudinal housing having a substantially circular cross-section and provided with a restricted inlet opening and an outlet opening at opposed ends thereof, a longitudinal insert body disposed coaxially within said housing and spaced therefrom to provide an annular duct diverging from the inlet opening and converging at the outlet opening, a hollow cylindrical sleeve-like member mounted coaxially within said insert body and slidable coaxially therein toward the restricted inlet opening in said housing, the diameter of said sleeve-like member being substantially the same as the inner diameter of the restricted inlet opening so that the end of the sleeve-like member will engage the restricted inlet opening to close the diverging annular passage between said housing and said insert body and means operable by a compressed gas for sliding said sleeve-like member to close the annular passage and for admitting the compressed gas into the annular passage to expel the liquid therein through the outlet opening.