FI78430B - UTOMBORDSMOTORBAOT. - Google Patents

Description

78430

OUTBOARD BOAT

The present invention relates to an outboard motor boat according to the preamble of claim 1.

5

One of the biggest problems with outboard motor boats is the stern depression and, accordingly, the rise of the cook. This, in addition to increasing water resistance and increasing fuel consumption, poses a serious, potential safety-10 risk to small boating if the boat uses an over-efficient outboard. If the upper edge of the stern of the boat is pushed very close to or below the waterline, there is a risk that the boat will fill with water and the boat will sink, which will happen very quickly in terms of rescue measures.

Efforts have so far been made to eliminate this stern sag with various wings, floats and boat design. So far, however, the problem has not been resolved with sufficient certainty.

It is an object of the present invention to provide an outboard motor boat which does not have such a weakness as mentioned above and which, moreover, would be even more economical. It is a further object of the invention to increase the load capacity of the boat to facilitate the boat to slide and stay afloat at low speeds.

These objects are achieved by a stern-30 motor boat according to the invention, the characteristic features of which are set out in the appended claims.

The invention is thus based on the ingenious realization that the bottom of the boat is shaped with respect to the horizontal plane of the boat in the direction of the longitudinal axis 35 towards the stern of the boat downwards. In this case, the bottom compresses the water and at the same time, thanks to the larger surface area, the carrying capacity of the boat increases and the sliding lift is facilitated. In addition, the backward-curving shape of the bottom, together with the counter-force 5 applied to the bottom of the water, forces the boat's cook to turn downwards even at slow speeds, which tends to eliminate stern sag while maintaining markets and engine power, which is particularly fuel-efficient.

The invention will now be described, by way of example, with reference to a preferred embodiment thereof, with reference to the accompanying drawing, in which Figure 1 is a perspective view of an outboard motor boat according to the invention and Figure 2 a side view of the boat of Figure 1.

In a preferred embodiment according to the figures, the bottom of the boat is divided into two halves of similar design.

In the direction of the longitudinal axis of the boat, as shown most clearly in Figure 2, the profile of the bottom is shaped to be both backwards and downwards. In this case, as the boat moves forward, the relative movement of the water mass generates a lever force and causes said boat to tend to sink downwards on said curved surface, whereby the critical speed at which the stern of the boat begins to sink. By changing the curvature, not only this critical speed can be controlled but also the boat's load capacity. It has been found in driving tests that when the bottom is curved downwards by about 40 mm at 1 m, a significant improvement 35 is achieved in both the load capacity and the slip lift capacity of the boat. the entire bottom or at least the concave parts of the bottom curve downwards with respect to the horizontal.

5

The invention has been described above only by means of a preferred embodiment thereof. This, of course, is not intended to limit the invention and, as will be apparent to those skilled in the art, the invention may be varied considerably within the scope of the inventive idea defined by the appended claims.

Claims (2)

4 78430 1. A single-hull outboard motor boat, in particular a wooden, metal or fiberglass hull boat with support floats (1) projecting from the side of the outboard motor to be attached to its stern, characterized by a downwardly curving shape of the bottom of the boat in the stern of the boat. under 10 and the rise of the boat's cook on departure is prevented, while the surface slip and especially the load capacity of the stern of the boat improve as the speed of the boat increases. Improved bottom design of an outboard motor according to claim 1, characterized in that the stern-side bottom curves downwards by about 40 mm by 1 m. 20 1. In the case of self-contained motor vehicles, in the case of non-metallic or non-metallic glass tubes, in the case of fly-by-side toners (1) bäten, varvid när bäten är i rörelse vattenmas för-blir som pressad under den nämnda delen av botten ooh 30 vid avgäng av rörelsen är uppstigningen av bätens förhindrad veltidig s somturidning och särskilt bxt-betten meddel . 35 2. The design of the bottles according to the invention is defined in claim 1, the design of which is shown in the invention. 40 mm head av-stand av 1 m.