FR2467770A1 - Self righting marine craft - has flexible container filled with water in lowest part to induce increased righting couple when capsized - Google Patents

Abstract

The righting weight consists of a flexible container (2) which is slung across the lowest part of the vessel (1). The container is filled with water and spans the max. width of the vessel. The presence of the container, when the vessel has capsized, produces a righting couple which increases when the craft is off the level position due to the water flowing on one side by distorting the flexible container. The flexible container is fitted with filling and draining connections and auxiliary floats are fitted for stability during filling.

Description

Purpose: The system defined below is intended to increase the safety of floating devices such as lifeboats and liferafts, inflatable or rigid, service boats capable of under maximum navigation conditions, but being normal for said devices. find at a given moment, in an inverted position as a result of an external fact (breaking wave wind, engagement of the AV or the AR) or interior (untimely movement of the payload) to the boat.

I1 makes the machine considered unstable when it is in the "return sweating" position and incidentally contributes to increasing its stability when it is in the normal position.

As a result, it becomes impossible for this boat or machine to float on its back and to block its passengers under it.

Principle: The instability caused by the system results from the exploitation of the capsizing torque existing on board a floating craft when, as a result of the relative positions of the center of the hull and the center of gravity of the latter as well as its inertia of flotation and the existence of liquid hulls.

The characteristic torque of the stability defined by the formula C = (h - a) sin 0 (which, in normal position is a positive torque tending to bring the machine back to its original position, becomes, in the case of operation of the system a negative torque which then accentuates the imbalance and moves this machine away from the position acquired during the capsizing.

The machine therefore returns to its normal floating position, which is the only stable one.

System description: The system consists of
A boat in any material, rigid or not, on which are placed: after or during its construction or provided from the design a) a flexible capacity of any shape located as low as possible, generally in or under the bottom of the machine and in solidarity with these funds.

This capacity of a volume adapted to the characteristics of the machine is filled with water by any means (pump, funnel, etc.) but is not in direct communication with the liquid mass supporting the machine.

It is equipped with means of suction, emptying, air evacuation and a self-sealing overflow.

b) auxiliary or integrated rigid or flexible floats arranged to support the machine during overturning and to contribute to the creation and increase in force of the so-called "capsize" torque.

System action: The boat being upside down the water invades the interior and causes, as a result of the arrangement of the auxiliary floats, the shape of the boat, the volumes then submerged a noticeable and even very important of its inertia of flotation, as well as a lowering of the center of the hull.

The capacity containing the liquid hull is then in the high position.

The center of gravity of the assembly is then raised.

As the flotation inertia is very low the initial stability modulus (a J is negative and the equilibrium position does not exist.

Furthermore, due to the arrangement of the floats, the machine is very sensitive to a shift in weight in the heights.

The machine therefore tilting, the liquid mass will move in the direction of the tilt, thus accentuating the movement initiated.

The machine then returns to its original position.

Sketches attached: The machine represented on the attached sketches is given only as an image.

The system can employ any shapes of gear, types of auxiliary or integrated floats, any shapes of hull capacity and arrange them in any way as well.

In plate 1: Figure 1: The machine is represented in normal waterline.

Figure 2: The machine is shown in inverted waterline.

In plate 2: Figures 3 and 4: The machine is represented in 2 positions inter
turnaround mediaries.

Item 1 indicates the auxiliary floats.

Reference 2 is the machine itself.

Mark 3 is the bottom of the machine.

Reference 4 is the inside wall of the capacity.

Mark 5 the liquid introduced.

Claims (5)

Resale I) Automatic or non-automatic righting system for floating devices or not characterized by the use of a closed flexible capacity, filled with water, creating a negative stability torque in the inverted position of the floating device, tending to bring it back into its normal position. 2) Righting system for floating devices characterized by the use of a flexible capacity, of any shape, but adapted to the device considered, partially or completely filled with surrounding liquid, placed as low as possible in the bottom of the craft or on the outside under these bottoms, creating an effect of liquid hull and weight displacement. 3) Righting system for floating devices characterized by the use of auxiliary floats made integral, by any means, with the device in question and contributing to the creation of negative stability. 4) Righting system for floating devices characterized by the combined use of the capacity defined in claim 2 and the floats defined in -la claim 3 5) Righting system for floating devices characterized by the combined use of the capacity defined in the claim No. 2 and watertight boxes Or floats integrated into the structure of the craft.