DE19544384A1 - Single stern ship design, with added drive bodies in W=frame form - Google Patents

Abstract

The ship design involves the application of Laval type outflow in the submerged region of the stern, with channelling of the free-stream flow from the bow to form a Laval jet. There are recesses which become semi-circular towards the bow and quarter-circular towards the stern in the central stern keel zone ( C ). The frames are of W-shape in the normal design for single stern ships. There may be a special form of bow to reduce water resistance using drive bodies in the case of single stern ships, to optimise the flow channelling of the W-frame shape.

Description

It is a W-frame shape in connection with a "Lavall" -like Outflow to improve propulsion in "sail and motor operated boats and Ships "!

Due to the special W-frame shape and the semi-glider shape of the middle fuselage the fuselage is raised even at low speed (Resistance reduction).

The surface tension in the water - am Middle part of the hull - reached, which is guided in the "Lavall" -like underwater hull shape discharges and contributes to propulsion or reinforces it.

The special W-frame shape with lead keels increases the stability on the wind Heeling resistance - increases the righting moment during gusts and simplifies it Falling dry at low tide!

With the W-frame shape, the available space can be used more cheaply, at at the same time "more in m³ / m²" - measured on the hull area - the required draft and repression.

The "Lavall shape" and the W frame can be designed specifically variably / run and complement each other in an ideal way!  

EFFECTIVENESS OF SHAPING IN THE UNDERWATER AREA

Through the propulsion of the hull (sailing or motor power) and its own weight between the two buoyancy bodies - in the area of the middle hull - water into one certain direction (towards the rear) displaced, which results in a surface tension of the Water builds up in the middle of the trunk. This surface tension will now through an underwater ship shape following the Lavall legislation (i.e. tension / pressure seeks relaxation) directed and discharged.

As a result, the water flow in the "nozzle area" and subsequent rear area accelerates and there is a suction effect in the middle trunk area. Both contribute Reinforcement of propulsion and reduction of water resistance.

A positive side effect of the "W-frame shape" is the relative, over-wide construction, which the displacement ratio to the usable space (m³ / m²) and the required draft (Water resistance) significantly improved.

The two buoyancy bodies with lead keels or fins improve the directional stability, the heeling ratio, as well as the righting moment for lead keels. The "W-Shaping" also has an extremely beneficial effect on dry falling at low tide, as well docking for necessary repairs.  

DESCRIPTION

It is a monohull hull with a commercial surface hull with attached buoyancy hulls ("W-shaped underwater hull") that can be manufactured in commercially available designs!
This means:
The above-water hull, which is trapezoidal in shape, is arranged under water (CWL) in the outer third of each two symmetrical buoyancy elements with lead keels or fins (W-shaped frame).

In between - in the underwater area (middle hull) - runs with the buoyancy heads Firmly connected middle hull with reduced draft, from aft (in front of Lavall nozzle) to the Bow, from the central frame, rises slightly in semi-sliding form. From the central frame to The stern hull runs horizontally to the ship's transverse axis. Are in this area also the two aerodynamically shaped buoyancy bodies - mirror image parallel running towards each other - shaped towards the rear.

The underwater hull, aft to stern, is horizontal to the middle hull area Ship's longitudinal axis, semicircular to the bow, between the two buoyancy bodies executed. The ship's floor forms in this semicircle in the central hull area again in a quarter circle of considerably smaller diameter (depending on the Ship size) upwards.

At the end of this small quarter circle, the middle trunk area floor rises evenly Rear. The two buoyancy bodies are alike in the area of the semicircle The fuselage flows smoothly and runs parallel to the outside - on its inner edge towards the rear and pass into the rising middle hull bottom. In the top view, the Impression, it is a rocket nozzle.

After the "Lavall nozzle", the rear of the buoyancy bodies is a mirror image of each other, Following the hydrodynamic shape, rising to the rear. The direct rear shape The shape can be adjusted variably. The bow area itself is commercial in the Above water level and flows in, flowing flatly, briefly above CWL in hydrodynamic form Middle hull and buoyancy over.

Reference list

A = special bow shape
B = float
C = middle trunk
D = tear-off edge (semicircle)
E = tear-off edge (quarter circle)

Claims (5)

1. Application of the Lavall-like outflow in the underwater area Aft with channeling of the flow from the bow to the "nozzle shape" (Lavall nozzle). 2. Semicircular towards the bow, quarter-circular in the semicircle, towards the stern funnel-shaped depression in the center hull / keel area, rising to the stern according to claim 1. 3. "W" -shaped frame shape for monohull hulls of commercially available types. 4. Special bow shape to reduce water resistance when used of buoyancy bodies in monohull hulls and for optimal Inflow / channeling of the W-frame design according to claim 1 + 3. 5. Connection of two buoyancy bodies to monohull ship forms in a fixed design according to claim 3.