Straight wall constant humidity long slide type sharp bilge planing boat type

Abstract

The invention discloses a straight wall constant wetted length slideway type round bilge speed boat shape which is characterized in that a boat body comprises two straight wall constant wetted length round bilge lateral bodies in left-right symmetry, slideway tops and slideways, the straight wall constant wetted length round bilge lateral bodies are formed by straight wall contour lines, slideway contour lines, stern cross section lines, stern bottom oblique ascensions, midship cross section lines and midship bottom oblique ascensions. The straight wall constant wetted length slideway type round bilge speed boat shape has the advantages that the wetted length is constant, during sailing, waves and flying foams on the outer side of the boat body are reduced greatly, the waves, flying foams and air flows on the inner side of the boat body flow through the slideways and flow out towards the rear of the boat at high speed, parts of the energy of the waves and flying foams on the inner side of the boat body are recycled by the slideways (equals to wave and foam elimination) and converted into the dynamic lifting force of the boat body along with the air flows, the operability, navigability and seakeeping performance of the boat shape are increased greatly, and the boat shape is applicable to sea conditions 1-2 levels higher than those which traditional speed boats are applicable to. In addition, due to the fact that the wetted length of the boat shape is constant, the performance of the boat shape can be favorably and theoretically analyzed and researched by using length Froude number.

Description

technical field [0001] The invention relates to a catamaran planing boat type with sharp bilge, in particular to a military and civil catamaran planing boat type suitable for normal navigation under relatively high sea conditions with a Froude number greater than 1.0 in length, and belongs to ship type technology field. Background technique [0002] The bilge planing boat is a small boat that slides at high speed on the water surface. It is widely used in military and civilian fields, such as torpedo boats, missile speedboats, high-speed traffic boats, high-speed luxury yachts, high-speed racing boats, etc. The sharp bilge planing boat has greater wave-making resistance and smaller spray resistance when taxiing at low speed, the sum of these two resistances accounts for more than 70% of the total resistance, and the proportion of wave-making resistance decreases with the increase of taxiing speed However, the proportion of droplet resistance increases, and the sum of these ...

AI Technical Summary

Problems solved by technology

[0003] When the traditional catamaran planing boat with sharp bilge sails in the low-speed displacement state, because the planing boat has a small length-to-width ratio and has a sharp bilge, it has greater wave-making resistance than the catamaran displacement ship, and because the traditional catamaran The wetted length of the sharp bilge planing boat will be significantly reduced when it takes off, and there is an obvious wave-making resistance peak at this time, and the wave-making resistance is relatively large; The length is greatly reduced, so that the longitudinal motion stability of the bilge planing boat is greatly reduced, the seakeeping performance is deteriorated, and even in slightly higher sea conditions, it cannot sail normally, thus limiting the range of operating conditions of the traditional catamaran bilge planing boat

Different from conventional displacement ships, as a dynamic lift ship, the planing boat will change its navigation state with the change of speed during navigation, mainly the wetted length of the hull, the draft of the hull and the longitudinal direction of the hull. The change of the inclination angle, which brings inconvenience to analyze its performance with the length Froude number

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