Editorial Note 2012101872 The abstract and drawings of this application are consecutively page numbered following the claims. Abstract Page: 7/16 Drawings Pages: 8-16/16 AUSTRALIA Patents Act 1990 COMPLETE SPECIFICATION INNOVATION PATENT KAPTEN HYDROFOIL WING Water craft accessory Invention by Patrick Xavier Jones Index Title page Index 1116 I Foreword 2416 1i The reason of this invention 2416 III Existing situations 3116 IV Description of the invention 4/16 V Working principle of the invention 5116 VI Claims 6/16 VII Abstracts 7/16 Draw. 1 8/16 Draw. 2 9/16 Draw. 3 10/16 biraw. 4 1 slib Draw. 5A 12/16 Draw, 5B 13/16 Draw. 5C 14/16 Draw. 6 15/16 Draw. 7 16/16 1/16 KAPTEN HYDROFOIL WING I) Foreword 1 The presented invention relates to a speed and ride improving accessory for a watercraft. 2 Throughout the specification, the meaning of the terms; " bow"(front off the boat), 3 "stern"(rear of the boat), gunwales"(upper edge of the side), "transom"(crossbar) , and 4 "chine"(botton/side ridge), are to have their intended nautical meanings readily 5 understood while speaking of areas of a watercraft for positioning the invention in relation 6 to the performance enhancement to the watercraft. 7 The following describes a non-limiting example of the invention being used on a boat, 8 which with the exception, of some limited complementary modifications, is not a special 9 type of watercraft. 10 11 12 11) The reason behind this invention 13 When a watercraft is moved through water, it gains resistance created by the boat's body 14 in the replacement and the flow of water over its surface. For that reason a boat is 15 shaped, so that the bow will out of the water to gain speed, which is called "planning". At 16 this speed, any rough water called "chop" will hit hard against the hull, causing slamming 17 with sudden unexpected deceleration, affecting the safety of the crew on board and/or 18 even damage to the boat hull. 19 The solution is or to reduce the speed to obtain a more comfortable ride or create a 20 situation where the "chop" has less effect on the boat's hull at speed. This situation is 21 created by this invention. To obtain such a situation it is important to hold the boat's bow 22 further out of the water so the choppy water has less effect on boat's body. This will 23 enable the boat to obtain a higher speed as less boat's body is in touch with the water. 2/16 Il1) Existing solutions 1 Existing solutions are hydrofoil boats. Hydrofoil wings are based on the difference in 2 water pressure above and under the body. This effect based on the equation of Bernoulli, 3 creating lift, similar to an aircraft wing. (see drawing 6) The hydrofoil being a wing shaped 4 fin (1) which a top chord (5) longer than the under chord (6). This will create an under 5 pressure (2) at the top of the fin, and a slight over pressure (3) caused by the positive angle 6 of attack (7) at the bottom. This will create a lift force (4), which lifts the boat out of the 7 water. 8 The big disadvantage with this type of lifting device is, that it is totally based on water 9 flow, like air speed on an airplane wing. Water has a higher density than air and 10 turbulence will create a much bigger effect. Sudden increasing currents towards the boat, 11 will uncontrollably lift the boat higher at the same speed and sudden back up currents in 12 the moving direction of the boat, like in surf, will partly, or even in the worse case totally, 13 eliminate the lift effect, this creating the boat to crash noose down into the water at high 14 speed. Sudden side or angled currents, including waves (created by e.g. other boats) will 15 lift the approaching side foil first. In dangerous conditions, it is possible to roll the craft 16 dangerously side wards, or even to roll it over. 17 To prevent all these calamities, a sophisticated and often complicated control system is 18 added to these hydrofoil systems, to compensate by moving the fin angles or using 19 trimmer flaps. This makes these systems very expensive and too costly for normal 20 pleasure boat use. 21 The difference with this invention, it is based mainly on lift-induced drag on a body caused 22 by the pressure rise, in this case, by water "trapped" under the V or C shaped body. In air 23 use, this was first used by Alexander Uppisch and is called "ground effect" The main lift is 24 created not by under-pressure above the body (as in the case of hydrofoils), but by over 25 pressure under the body. This pressure rise is created by water trapped under a narrow 26 long body shaped like a reversed V, C, or W. with a narrow cross projection in the 27 longitudinal direction. The creation of high pressure under this body creates a lifting 28 effect. When a curved body is used as well (see drawings 3a and 3 b, an additional small lift 29 force is created by under-pressure above the body. Because the body is long and narrow, 30 unlike a usual hydrofoil wing (which is wide and short), it has a small approach surface but 31 is much more stable in the directional way due to its shape, than the hydrofoil wing. 32 Because of trapped water creates a pressure cushion it does not need the control systems 33 of the sophisticated hydrofoil fin systems. 34 35 36 37 3/16 IV) Description of the invention (see drawing 1) 1 The invention consists of a long body (3) with a flat or rounded top (1) and an inverted V 2 or C shaped bottom (in the longitude direction)(2) which is connected to a strut (4), at the 3 side of the inverted V or C shaped body to winglet shaped fin, positioned under a 45 4 angle (5). 5 As shown in drawing 7 this inverted V shape (7.1) can also be an inverted U shape (7.2) or a 6 M shape (7.3) or an angles C shape. 7 Drawing 5a shows a few of the possible configurations. Different configurations are 8 possible. 9 Drawing 5a shows the skid profile (3) with upstanding anti-turbulence fins (10) connected 10 to an adjusted strut (2) which is fitted with a pin (6) to a bracket (7) which is fitted to the 11 gunwale of the boat (1). The strut (2) is held into position with two adjusting bars (4), one 12 right and one left. They are connected to the strut (4) at point (9) and to the gunwale (5) 13 and can be adjusted in different positions (see dotted lines). When the speed of the bow of 14 the boat can be trimmed with the engine (8). 15 Drawing 5b shows how the skid bodies (3) are connected to struts (4) which are mounted 16 in a sliding arrangement (10), to allow adjustment of height e.g. fully up(7). This sliding 17 arrangement (10) can be pivoted round a slewing arrangement (8) which allows the driver 18 to select different angles of approach (drawing 2). These slewing arrangements (8) are 19 fixed to an outrigger beam (10) which is fixed to the boat hull (1), which is driven through 20 the water by e.g. an outboard motor (2). 22 The angle of approach can be fixed, or adjustable by a mechanic, hydraulic or other 23 operating device. When fully lifted it is in the up position (5) Adjusted in height (drawing 24 5b.a), Angle adjusted (drawing 5b.b) or stored out of use position (drawing 5b.c). 25 Drawing 5C, shows a set up where the strut (2) is positioned sliding in a centre board 26 casing (11). By tilting the strut (2) in the casing (11) backwards or forwards, the angle of 27 attack can be altered. When not in use , the invention can be lifted (see dotted lines in 28 drawing 5C. 30 31 32 33 4/16 1 V) The working principle of the invention(see drawing 2) 2 The invention is based on the "induced drag" principle, which is used in the aircraft 3 industry to produce "ground effect" crafts. It can also be used in other environments like 4 water, However the non compressibility of water will have a much more direct effect than 5 air. It is based on the fact that the carrying mater (in this case water) is restricted in its 6 normal flow (free stream) and obstructed by the inverted shape of the bottom of the 7 invention's wing to escape side wards. This will force an effective reaction of lift. This will 8 be vectored in Induced Drag (ID), horizontal and vertical lift which will create a lifting 9 force on the strut and in sequence the whole boat. 10 This effect can be adjusted by altering the (Angle of Attack A.o.A) on the skid body, The 11 result will be an Induced Downwash Angle (L.DA), which would be an average between the 12 Relative Water (RW) flow (free flow) and the chord line (CL), created by the angle of attack. 13 When this angle is adjusted to be steeper, the lift will increase but also will the induced 14 drag. By adjusting it just to the correct balanced position, the lift will be sufficient with the 15 slightest amount of drag. This lift force (drawing 3b) is designed into this invention. 16 When the invention has a curved body shape as shown in drawing 2 and 3a, an additional 17 limited lift will be added due to Curvatec Effect as the longer top chord will create a under 18 pressure above the body. (see bottom drawing of drawing 2) 19 (see drawing 3) 20 Because the Induced Drag force is generated under 90" to the surface in case of the 21 inverted V shape, its vectors will relate vertical to lift, and horizontal to be a self correcting 22 longitudinal stability force, particularly because the skid body is much longer than it is 23 wide. In the position 3a and 3b (when the boat and skid strut is exactly vertical), both 24 horizontal forces will compensate on the face of the of the inverted V. These compensating 25 longitudinal forces will create a self correcting effect in the straight direction and prevent 26 diversions to left and right caused by influences from outside. (See drawing 4) This makes 27 steering a lot easier and safer in rough water conditions. 28 The long sides of the body will react as a vertical fin, preventing sudden side wards drifts 29 as would be on a simple hydrofoil. 30 Because the invention has the inverted shape it works like a shock absorber when 31 submerged, and when the boat is anchored. Vertical movements are suppressed 32 reducing the effect of the waves to the boat, due to the shape of the invention, 33 thereby making the situation for the crew in the boat more comfortable when at 34 anchor and/or in rough water conditions. 35 36 5/16