Ships – Hull or hull adjunct employing fluid dynamic forces to...
Patent
1993-06-09
1995-03-07
Avila, Stephen P.
Ships
Hull or hull adjunct employing fluid dynamic forces to...
114 56, B63B 100
Patent
active
053948190
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention concerns a bottom construction for a boat, as specified in the preamble to claim 1.
In designing the bottom structure of fast, planing boats endeavours are to minimize the water resistance, or the wet surface area of the boat, at the same time maintaining good running characteristics, directional stability and steerability of the boat.
One has in prior art attempted to improve the running characteristics of a boat by means of various transversal step designs with which the water flows are guided in desired manner underneath the bottom, and by which the boat is made to rise higher, thereby reducing the wet surface. Likewise known in bottom designs of prior art are various grooves, channels and other guides longitudinal to the boat, by which one attempts to maximize the favourable action of water flows under the bottom.
The problem associated with most bottom designs of prior art is, however, their high planing ascent threshold, that is, when the speed is accelerated the bow of the boat rises up steeply, and only after having gained a certain speed the bow sinks down and the boat rises and begins to plane. However, the boat keeps planing even at considerably lower speed.
The second problem with boats of prior art consists of its planing properties in sharp curves. If the hull shape in boats of prior art at all enables sharp turns at high speed, the hull sinks to rather great depth in the water, as a consequence of which the speed of the boat drops strongly, whereafter the planing ascent threshold has to be exceeded once more, in order to regain the original speed.
The third problem in fast boats of prior art consists of the powerful centrifugal forces in curves, a circumstance which significantly impedes any work done in a fast-moving boat. It also causes operating trouble in the case of various pieces of technical equipment, e.g. the armament which naval forces use in fast boats.
SUMMARY OF THE INVENTION
The object of the invention is to eliminate the drawbacks mentioned. In particular, the object of the invention is to provide a novel boat bottom construction which has no planing ascent threshold, which is nearly insensitive to various loads, which presents good steerability within the whole speed range of the boat, by which the detrimental effects of the centrifugal forces acting in curves can be eliminated, and by which the speed of the boat can be significantly increased without increasing the engine power.
Regarding the features which are characteristic of the invention, reference is made to the claims section.
The boat bottom structure of the invention comprises a transverse and substantially planar stern, a bow with comparatively pointed and tapering shape, and sides symmetrical with reference to the keel line, which form an outwardly substantially convex shell over the frame structure. As taught by the invention, the bottom structure comprises a bottom portion extending from the stern towards the bow up to a certain distance, this part of the bottom being constituted by central bottoms located on either side of the keel line and subtending with each other a keel angle and of outside bottoms extending outward from the outer margins, parallelling the keel line, of the central bottoms and subtending a bottom angle with the central bottom on the respective side. Furthermore, the widths of the side bottoms are at least equal to those of the central bottoms and, moreover, the bottom angles are at least equal to the keel angle. Moreover, in the bottom structure of the invention the bottom line, between a central bottom and the outside bottom, runs parallel with the keel line up to a certain distance from the stern of the boat towards its bow. Hereby, in the bottom structure of the invention there are three lines extending from the stern towards the bow and forming an angle on the bottom: the keel line in the centre of the bottom, and on both sides thereof, bottom lines which are parallel with the keel line.
Thus, in practice, the boat bottom of the inve
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Avila Stephen P.
Palkkiyhtyma Oy
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