AU2018330620A1 - Rear supporting hydrodynamic assembly of an outboard motor for a lowered motor position - Google Patents

Abstract

The invention relates to a rear supporting hydrodynamic assembly of an outboard boat motor on a hull engaging with a set of front foils, the outboard motor being driven by an underwater propeller motor assembly driven by a direct motor shaft actuated by an indirect motor shaft, on a motor propulsion fairing comprising anti-stacking and anti-cavitation plates positioned above the propeller intended for being positioned at the water level, characterised in that the motor fairing is covered by a hydrofoil (10) added at the front onto the direct shaft fairing cone, a deflection crown (80) added above the anti-stacking and anti-cavitation plates and in front of the indirect motor shaft fairing, an added hydrodynamic permeability profile (70) inserted in front of the indirect motor shaft fairing, occupying the space in front of the motor between the top of the anti-stacking and anti-cavitation plates and the bottom of the deflection crown (80), the rear of the hull is provided at the level of the placement of the deflection crown with a deflection plate (90).

Description

Rear supporting hydrodynamic assembly of an outboard motor for a lowered motor position

The present invention relates to a hydrodynamic rear upright assembly for outboard. The invention is particularly suited to the class of motorized boat of the outboard type, and in particular to that known as a semi-rigid boat.

Semi rigid boats include a rigid hull and inflatable side protective floats. These boats are not yet equipped with foil wings in water, also known as foil. Indeed, the recent foil technology has been adopted by different types of sailing and motor boats but has not yet been adopted for semi-rigid motor boats. It has been previously described by the present depositor a patent for a front wing foil for semi-rigid boat with wings approximately situated in the middle of the boat and on each side. The present invention proposes a rear upright assembly which cooperates with the front wing upright system in order to ensure optimum lift and navigation.

There are currently rear upright systems which are designed to provide slight planing, without associated front lift. These systems have a very relative effectiveness and are in fact quite disparaged, or even deemed ineffective . They consist of adding airfoil wing on the anticavitation plate of the motor. In short, the prior art describes attached appendages which provide a slight improvement in rear lift. The effect is very limited since the front lift is not improved. The invention has a much broader object which is to provide a rear lift which cooperates with a front lift. As will be understood on reading this description, the invention must solve a series of difficult problems which consist of A - proposing a rear upright system with new performances never achieved B - Do not harm the traditional performances, when the boat is used unworn in traditional sailing conditions. In short, the invention aims to propose a hybrid rear carrying system which operates both in carrying condition, but also in noncarrying condition.

It is understood that the invention aims to use existing solutions to provide new lift. This second solution solution requires modifying key navigation parameters, such as that of the position of the engine underwater, which is typically lowered, as will be easily understood, to respond optimally to the fact that the boat is raised. In short, the boat being raised, it must be possible to lower the position of the engine underwater. The invention proposes a system which allows the outboard motor to be dressed in the lowered position in order to respond as much as possible to the constraints of using an outboard boat. It being understood that in certain aspects of use, the engine can be lowered or raised underwater during navigation. It is therefore necessary to provide the engine block with an improvement which improves the navigation characteristics when the engine is lowered but which does not harm navigation when the engine is positioned in its traditional position.

A main object of the invention is to propose a rear upright assembly which adapts to the whole the complete rear of the boat, namely to its engine and to its hull and to its engine hull.

An object of the invention is to provide a rear upright system which is easily industrializable and which is adaptable as an original equipment or as a second equipment on a boat.

An object of the invention is to provide a rear upright system which is robust and economical.

An object of the invention is to maximize the lift and to lift the boat as far as possible from the water.

In a main aspect, the invention provides a rear upright system which includes the cooperation of new airfoil and plate deflector.

In one aspect the invention provides a upright wing which is placed on the casing of the propeller motor shaft. It was not obvious to position the upright wing at this level because naturally the reflex is to think that this position harms the quality of traction of the propeller which sees an additional obstacle added in front of it.

In one aspect, the invention proposes the addition of deflecting reference plates and hydro dynamic penetration profiles in water which are particularly artfully arranged.

The invention will be better understood on reading the appended figures in which is represented a particular embodiment of the invention in which :

- Figure 1 shows a top view, according to the invention, of the distribution of the bearing surfaces

- Figure 2 shows the bottom profile view of a traditional motorization

- Figure 3 shows a profile view in the low position of the engine according to the invention

- Figures 4a, 4b, 4c show respectively views from above, of an engine deflector plate, a boat deflector plate , and the upright wing according to the invention.

- Figure 5 shows the engine underwater not equipped with the invention and not lowered

- Figure 6 shows the engine lowered under water equipped with the invention

- Figures 7a, 7b and 8a, 8b show a front and side view of hydro dynamic deflection plates according to the present invention

Figure 1 shows a top view, according to the invention, of the distribution of the bearing surfaces with two front wings (Ila, 1 lb), a port front wing (Ila) and a starboard front wing (1 lb). A rear wing (10) positioned on the central longitudinal axis, at the rear of the boat, typically secured to the hull of the engine assembly.

FIG. 2 represents a side view of the bottom of traditional motorization. Which includes a propeller (20) propelled by a direct direct drive shaft (23). The direct motor shaft (23) being substantially horizontal and is driven by an indirect motor shaft (24) return, at 90 ° relative to the direct motor shaft (23). The indirect motor shaft (24) joins the motor unit positioned above the water. The direct drive shaft (23) is ducted in a body warhead shaped. The vertical indirect motor shaft is streamlined in a substantially tubular oblong bodywork. Traditionally, the hull of the indirect motor shaft includes grooves called anti cavitation plate (22) and anti spray plate (21). These plates have the function of channeling the air and liquid flows to optimize the operation of the propeller underwater. In the context of the present invention, the engine is mounted in its lowest possible position underwater, in order to be able to raise the boat as high as possible above the water, ft is understood that in this case the relative position of the anti cavitation plates and anti spray plates are lower compared to the hull of the boat. In short, the whole hydrodynamics of the boat is totally modified compared to the standard operation of the engine. In view of this, it appeared necessary to design and create new deflection plates, positioned in new places. The invention must therefore dress a part of the engine which traditionally was not submerged to make it hydrodynamic when it becomes submerged : The engine hull part above the cavitation plates. As shown in FIG. 3, the invention proposes to position the upright wing at the front of the direct engine hull (23) warhead of the propeller. After multiple calculations, tests, it was found that the hydrodynamic functioning of the boat was improved by positioning an engine deflection ring (70 ) positioned at the front of the indirect engine shaft hull, above the anti- spray plates ( 21) and anti cavitation (22). This deflection ring (70 ) can cooperate substantially on the same horizontal plane with a plate shell deflection (90 ) of boat substantially aligned that it is fastened under the boat hull. FIGS. 4a, 4b, 4c respectively represent views from above, of the front deflection column (80), of the hull deflection plate (90 ), and of the upright wing (10 ) which is fixed by a additional fitting (43) on the direct drive shaft hull (23). The upright wing adopting a symetrical shape making way for a left wing and a symetrical right wing for the left wing. In short, the invention achieves a combination of three innovations, namely, firstly lowering the position of the propeller under the boat, secondly, positioning a upright wing on the plane of the direct drive shaft of the propeller, thirdly, add a deflection ring and possibly a deflection plate on the top and on the front of the hull of the indirect motor shaft and in the extension under the boat hull. The deflection ring (80 ) can be a ring which has a set of double superimposed grooves in order to combine, for example, deflection forces on the air flows and on the water flows. FIG. 5 represents how, according to a traditional position, in normal position under water, anti cavitation and anti spray plates fulfill their hydro dynamic function, and how by lowering the position of the engine in water, the invention proposes the combination of a deflection ring (80) which may be located above a hydrodynamic penetration profile (70) which covers the engine hull in order to increase the penetration characteristics in water of the hull engine which prior to the invention was not profiled for working underwater. The deflection ring is positioned at the water and by means of the combination of two deflection plates positioned s one underwater and the other above the water involved in a return flow of air and water to optimize the operation of the engine and therefore the boat. Figures 7a, 7b and 8a, 8b show a front and side view of hydro dynamic deflection plates according to the present invention, with the penetration profile plate (70) which has a front elliptical profile for concentrating the water flow at the level of the internal structure , a leading edge (73) which maximizes penetration into the water, and in profile view in FIG. 8b, a deflection ring (80) which presents which has front view of an elliptical profile to concentrate the flow of water at the level of the internal structure , and in profile view a middle section which has a sharp penetrating attack profile (83) so as to optimize the hydrodynamic return. It being also understood that the deflection ring (80) and the penetration profile (70) have, in profile view on their rear, cutouts (74, 84) complementary to the shape of the engine hull so as to fit together securely on the engine hull in order to withstand the various forces that will be applied to it.

The present invention therefore relates to a hydrodynamic assembly carrying a rear outboard sailing on a hull cooperating with a set of front fenders (Ila, 1 lb), the outboard is driven by an underwater propeller motor assembly powered by a direct motor shaft (23) actuated by an indirect motor shaft (24), on a motor propelling hull comprising anti spray (21) and anti-cavitation (22) plates positioned above the propeller (24) intended to position at water level characterized in that the manufacturer's engine position is lowered underwater, the engine hull is covered with a upright wing (10) attached to the front on the shaft hull wedge direct (23), a deflection ring (80) attached above the anti-spray (21) and anti-cavitation (22) plates and at the front and the hull of the indirect motor shaft (24), an added hydrodynamic penetration profile fitted to the front of the inductor shaft hull direct (24), occupying the space at the front of the engine between the top of the anti-spray (21) and anti-cavitation (22) 10 plates and the bottom of the deflection ring (80), the rear of the hull is fitted at the height of the deflection crown (80) with a deflection plate (90).

It is clear that many variants possibly capable of combining can be made here without ever departing from the scope of the invention as defined below.

Claims (1)

1 - Hydrodynamic rear upright assembly for outboard sailing on a hull cooperating with a set of front wings (Ila, 1 lb), the outboard is driven by an underwater propeller motor assembly propelled by a direct motor shaft (23) actuated by an indirect motor shaft (24), on a motor propelling hull comprising anti-spray (21) and anti-cavitation (22) plates positioned above the propeller (20 ) intended to be positioned at water level characterized in that the manufacturer's engine position is lowered underwater, the engine hull is covered with a upright wing (10) attached to the front on the direct shaft hull (23 ), a deflection ring (80) attached above the anti-spray (21) and anti-cavitation (22) plates and at the front and of the hull of the indirect motor shaft (24), added hydrodynamic penetration profile fitted at the front of the hull of the indirect motor shaft (24), occupying the space at the front of the engine between the top of the antispray (21) and anti-cavitation (22) plates and the bottom of the deflection ring (80), the rear of the hull is fitted at the height of the crown deflection (80) of a deflection plate (90).