DE2008087A1 - Watercraft with partial aero static air cushions - Google Patents

Description

Watercraft with partial aerostatic air cushions.

In addition to the ones that have been known for a long time. Displacement, sliding and Hydrofoils or ships, there are watercraft that operate on the air cushion principle are constructed.

Here the air is pressed under the vehicle, which the vehicle over the water surface rises and then through the between the water surface and the lower edge of the vehicle @ Gap escapes at high speed according to the required pressure the normally uneven water surface a large gap width is required, whereby very large amounts of air constantly escape, which makes operation very uneconomical there is a strong build-up of noise and water spray.

The stabilization of the vehicle causes great difficulties, both in relation to the trim position, as well as especially in relation to the desired direction of travel.

The invention described below does not have these disadvantages.

It should be presented using an example, without this the scope of the application is to be restricted. This exemplary embodiment was actually built and tested in the form of a 4.42 m long motor boat.

Embodiment: The hull has in the middle on all cross-sections a box-shaped incision 1, which is open to the water (Figures 1 and 2) there remains a wetted part of the hull from the front to the rear increases in width and in the chiming line 2 smoke in depth.

The box-shaped incision 1 is slightly lower at the back (Fig. 2) than at the front (Fig. 1). It is at the front by a movable flap 3 and at the back by a movable flap 4 completed, which are movable around hinges 5,6 so that they against the incoming water can move backwards upwards. Feathers 7,8 press these flaps 3, 4 towards the water, with these through-stops 9, 10 within of the box-shaped incision 1. The springs 8 of the rear flap 4 are stronger and can be changed in their preload, or. reach under a different lever arm than the springs 7 of the front flap 3.

The uft is via a vertical pipe 11 above the flap 3 in the box-shaped incision 1 pressed in. The pipe 11 is over a knee 12 with a horizontal tube 13 and a flexible hose 14 connected to a spiral housing, the is built directly into the engine cover. In the volute casing 15 is located a rotor 16, which is directly on the crankshaft and flywheel of the normal outboard motor 17 is mounted. The rotor 16 is a radially acting impeller with forward curved Shovels.

The flaps 3, 4 are opposite the walls of the box-shaped incision 1 movably sealed. The injected air cannot escape and the The pressure required for buoyancy no longer has to be maintained dynamically, but rather is given aerostatically.

In the case of rough water, the box-shaped incision 1 passes through Each wave creates a compression of the trapped air over the resulting Increasing the pressure raises the boat without any jolts, creating too strong a progression prevents the flap 4 from escaping above the water surface when the pressure on its surface is greater than the spring force of feathers 8 The amount of air, as far as it is needed to build up the overpressure, is immediate supplied by the system 11-16, the energy requirement because of the small amount of air is low.

The stabilization with regard to the trim position is due to the side obtained boat bottom proportions both from the reserve plasma and from the change the upwelling areas are just as full when they are inclined to the surface of the water given, like the directional stability. The increase in performance through the reduction of the wetted area and ideal shaping of the boundary line between water and supply air available.

Claims (3)

Patent claims: 1.Watercraft characterized in that the buoyancy is partially is generated by weakly compressed air, which is in a box-shaped incision (1) is enclosed between movable flaps (3,4) under the vehicle while the buoyancy necessary for stabilization from the remaining wetted parts Boat bottom proportions results. 2.Watercraft according to claim 1, characterized in that the movable Flaps (3, 4) around hinge axes (5, 6) are pressed towards the water by springs (7, 8) are limited in their mobility by stops (9,10) and opposite the walls of the box-shaped incision (i) are movably sealed, whereby- all or some of the springs (8) are variable in terms of their bias could be. 3 .Watercraft according to claim 1, characterized in that the -necessary compressed air is generated via a rotor (16) in a spiral housing (15) works, which is part of the engine hood, with the rotor (16) directly on the Motor is mounted and via a line system (11,12,13,14) in the box-shaped Incision (1) using pipe sections that are above the highest possible Water levels are running out (11.12). L e r s e i t e