A skirt according to any one of the preceding claims, wherein each panel of the inner bag has a single skirt finger attached to it. low drag hovercraft skirt segments can be changed or replaced in less than one minute no You can also use other materials or fabrics, like K-way pieces, as long as it is flexible enough to inflate. This movement is done thanks to a ventilation system that sends air under pressure into the almost watertight skirts of the hovercraft, which allows it to rise. The standard color is With your soldering gun, slowly follow the shape of the cardboard. Educational Technology. Brand new skirt (still in box with instructions, simple day project). contact point where the skirt touches the ground moves. The skirt and the hull shape Do you need help deciding what to build for your application? This makes it relatively easy to release the attachments and remove the finger 22. By suitable removal of finger and inner bag panel attachments, the finger 22 and attached panel 40 can be removed from the hull 2 and outer bag portion 26 together. The skirt and air distribution design on the high-speed craft, again, is more complex, as they have to cope with the air cushion being washed out by a wave and wave impact. The hull typically also carries a cabin for the pilot/crew/passengers and, depending on the size of craft and intended use, may include further structures for holding equipment and/or cargo for example. I will demonstrate the following steps with a RC hovercraft skirt made with trash bags. Draw two horizontal and vertical axes which pass through the center of the semi-circle drawn previously. On a real hovercraft, where the semi-circle must be around 40 cm in diameter, you can go up to 12 equal circular sectors to get more precision - in that case you will get 15 sectors. A general aim of the present invention is to provide a combined bag and finger skirt in which it is more straightforward to remove the fingers, in which the top edges of the fingers can be easily attached to the underside of the inner bag to prevent wear and snagging and in which the inner bag can be easily replaced as separate sections. To go further, the following drawings and picture can give you ideas to get smoother finishes : instead of having only two 45 pieces, you can get a right angle with four 22.5 pieces, by adding an extra piece of skirt in the middle. The bag skirt employs an inflated bag surrounding the On a hovercraft the only thing that touches the ground is the skirt. Press the space key then arrow keys to make a selection. Use this arc length to divide the rest of the skirt. If you are making a RC hovercraft skirt : If you are making a "manned" hovercraft skirt : The least we can say is that designing a hovercraft skirt from scratch can be confusing. Fortunately, to make things easier, the skirt can be divided into several parts, as shown on the picture above : one piece of skirt for each side of the hull. Tape the ends first to tighten the skirt, then add tape along the strips. You don't need to know the angles. Take two pieces of skirt and put one on top of the other so that the corners match. Similarly, the attachment of a replacement finger 22 can be achieved relatively easily. Let's say we have made the template for the rear of a RC hovercraft with a 25 cm hull width. Our team of experts will get back to you as soon as possible. There should, A skirt according to claim 2 or claim 3, wherein the panels overlap one another by at least 5% of their plan area. In this example, let's say I'm making a template for the rear of the hovercraft, where I have right angles (90). You now need to draw the shape of your skirt using drawing software like Geogebra or graph paper. By using the tiled inner bag 28 removal and replacement of the fingers 22 becomes much easier than with a conventional bag and finger skirt because the finger attachments 48 can be accessed from above by lifting the forward edge of an adjacent panel 40 to access the attachments on the drooping aft edge 50 of the panel to which the finger in question is attached. In this example, as is commonly the case, the shape of the hull 2 means that the connection of the inner edge 34 of the inner bag portion 28 is inboard of the connection of the outer bag portion 26 to the hull 2. You can now cut the two strips and fold them in the right places to match the lines drew previously. You will notice that the strip is not perfectly straight, and that there should be two strips facing each other - this was a quick draft for me, you have to do better :-). The bag part 20 includes an outer bag portion 26 and an inner bag portion 28. A combined bag and finger skirt is a combination of the bag skirt design and the finger skirt design. ones. ). Filter by that will fully satisfy your specifications. of making the skirt may not be very low but it is important that once HOT Skater Chick Loses Skirt. Sorry to interrupt ! This field is for validation purposes and should be left unchanged. About: My name is Tho, I'm the creator and owner of diy-hovercraft.com. The continuous tube is inflated with pressurised air to provide a compliant seal between the craft hull and the operating surface. In addition, if the top edges of the fingers are not fixed to the underside of the inner bag, relative movement of the fingers not only causes wear to the underside of the inner bag but the fingers are prone to snagging obstacles and scooping water which intrudes between the fingers and the underside of the inner bag. Then turn it over like a sock, so that the solders are on the inside, for strength and aesthetics. Fig. Every Day new 3D Models from all over the World. The finger upper edges are attached to these flanges to prevent damage caused by snatching and water scooping. Hovercraft skirts - provided by 4 wings Hovercraft development - Tel. We will continue the tutorial with older drawings. So ends this tutorial on how to design and assemble a custom skirt, from your own hovercraft hull dimensions. Hovercraft use blowers to produce a large volume of air below the hull that is slightly above atmospheric pressure. New segments slide into a special slot along the hovercraft's edge without the need for mechanical fasteners, which enhances the sleek, agile appearance of all Neoteric hovercraft. Please take a few seconds to share. Image result for hovercraft skirt design. In addition, the invention is intended to improve the flexibility of the skirt bag. Divide the semi-circle into 8 equal circular sectors, each one being 22.5. Hovercraft Skirt Design http://www.leisure-hovercraft.comHovercraft Skirt Design http://www.leisure-hovercraft.comhttp://en.wikipedia.org/wiki/HovercraftRela. or jack-up the craft. This movement is done thanks to a ventilation system that sends air under pressure into the almost watertight skirts of the hovercraft, which allows it to rise. The Hovercraft narrow Front Segment Skirt System has extended inner diaphragm The invention relates to hovercraft skirts and in particular to hovercraft skirts of the combined bag and finger type. ground all the way around the craft. You read it well, this tutorial works for both ! Mainly a diesel engine in the mid-rear part drives the propellers. Therefore, we need the top of this piece of skirt to be 25 cm (25,1 cm because you will need a margin when sewing or soldering the pieces together). If you have a hard time understanding this tutorial, or if you want help with your skirt design, feel free to contact me at. To be more precise, this tutorial focuses on "vented bag skirts", which are the best compromise between ease of design and assembly, value for money and efficient operation. E-mail: [email protected], 2018 Neoteric Hovercraft, Inc The result may contain a very small margin of error, which will have no bad consequence. Hovercraft development This tutorial may seem difficult to understand at first but it cannot be simplified more at this point. print now Tags LRTee: Last Resort 22mm . Let's say we have made the template for the rear of a RC hovercraft with a 25 cm hull width. 6. Often it is The newer skirt designs dont spray as much water as the old ones do. Manufacturer of electrical power transformer. The hovercraft is an Air Cushion Vehicle (ACV) that flies above a land or water surface on a cushion of air. Material area of damage is compared for given test time, usually 3 hours. The skirt is one of the most important parts of a hovercraft because it allows the hovercraft to clear obstacles: the higher the skirt, the larger the obstacle that the hovercraft will clear. fore extra cushion area and thus more lift is provided at that side, Original (factory) configuration with tigershark teeth: . Finally, Neoteric has a patent pending on its exclusive skirt blowout protection system. Tape the skirt under the sides of the hull. Calculation of the Lifting Pressure 3. Moreover, our engineers team can also assist you in the design and development of the material (rubber coated fabric) that will meet your technical requirements. Whereas a conventional inner bag is a continuous web making it difficult to remove the fingers, the multi-panel 'tiled' arrangement of the inner bag proposed now makes it possible to more easily access and release the attachments between the finger and the inner bag to remove the finger or, alternatively, to remove a finger along with the bag panel or panels to which it is attached. For a large hovercraft, these two steps must also be performed - but using the appropriate tools and materials, of course. 5. Like shown on the picture, use these bisectors to reproduce the shape of the hull with a smaller ratio. To be more precise, this tutorial focuses on "vented bag skirts", which are the best compromise between ease of design and assembly, value for money and efficient operation. With a compass, measure the length of the arc marked in red. For RC models, the height of these strips can be 10% of the hull width. Use your compass to measure the distance between the penultimate dot and the last dot on the skirt profile, at the bottom left, and use this length as your last "X" gap. A hovercraft is a type of vehicle that rides on air that is under pressure. In this case, the compass was positioned at the top of the drawing, right above the center of the semi-circle. Image result for hovercraft skirt design. the tailoring, splitting it into a sensible number of panels which, Take the appropriate cardboard template and set it 1 mm before the corner. Note that the front and back of the "vented bag skirt" must be kept open to allow air to escape (again, see this page for more explanations). over obstacles so as to keep the loss of cushion air to a minimum. Have the ability to conform or contour efficiently Design of a hovercraft model using Pro/ENGINEER and SolidWorks. Finally, you obtain a vertical cut of your skirt : this is what your skirt will look like when inflated. Its breakthrough design and consistency pushes the hovercraft envelope even further. . Hovercraft (known also as air-cushion vehicles) are craft that can travel over water and land on a cushion of air. There are three main types of hovercraft skirt: bag skirts, finger skirts (sometime referred to as segmented skirts) and combined bag and finger skirts. Therefore, you need to set these strips first. Then, you need to choose what your hovercraft hull will look like. Sorry to say that I have no specific instructions to position the compass nor to set its spacing, I usually try several times until I get a correct arc. Hovercraft can be powered by one or more engines. A hovercraft including a hull and a skirt extending around and downwardly from the hull to form a plenum for an air cushion, wherein the skirt is a combined bag and finger skirt in accordance with any one of claims 1 to 6. This lightweight hovercraft (only 330 lbs) is constructed from molded fiberglass and has a Kevlar reinforced bottom for extra impact protection. This double-flange upper edge attachment is particularly difficult to use in practice. Use your compass to measure the distance between the penultimate dot and the last dot on the profile of the skirt, at the bottom left, and use this length as your last "X" gap. The QWERTOUR RC Hovercraft is a fully functional mini RC hovercraft. First, if you don't know much about hovercrafts skirts. 3. Musthane manufactures hovercraft skirts to your specifications. Join the dots, and voil, you have your template, ready to be reproduced on a piece of cardboard. All Neoteric Hovercraft anti-plow finger skirts give you an inventive quick-change system that The pressurized air, supplied by the lift engine, enters the skirt through ports in the side of the hull and exits via a . Hovercraft skirts feature an inventive quick-change system that allows the pilot to replace skirt segments in the field without the need for any tools whatsoever. Have a low maintenance cost. or graph paper. Let cool for 20 seconds, then gently remove the skirt pieces that will certainly be sticked both to the workbench and to the cardboard. When joined together by soldering or sewing, this part of the skirt will have an angle of 90. To be more precise, this tutorial focuses on "vented bag skirts", which are the best compromise between ease of design and assembly, value for money and efficient operation. Particularly on larger craft, large inner bag panels tend to exceed the width of commonly available flexible materials. A diaphragm in the front segments prevents them from collapsing and tucking under in the event of a plow-in; the segments stay expanded, delivering vital lift air to the front of the craft, which considerably lessens the consequences of a plow-in. Draw it at 1 : 1 scale to avoid mistakes, you have to be as precise as possible to get a good result. Team involved in high speed filiming exercise. pitch (fore and aft) and roll (side to side) stiffness of the air Skirt configuration greatly affects the performance of an ACV or an SES. In this tutorial we will learn how to build an Arduino based RC Hovercraft. Overlapping of adjacent panels also offers the benefit of a stronger multi-layer structure without having to laminate layers together (as is often the case in conventional inner bags, which increases the cost and stiffness). This allows maintenance personnel to enter the skirt system via hull access points and unfasten finger attachments without having the weight of the skirt bearing down on top of them. We can accommodate 16 foot hulls with the cut out and complete versions. A1. when sewn or glued together, adopt the shape required. By using this site, you agree to its use of cookies. A skirt (10) for a hovercraft including a bag section (26) for attachment to the hull (30) of the hovercraft and a plurality of fingers (22) extending downwardly from the bag section (26). Keep in mind that you may need a seam / joining allowance on all pieces. Erase the hull but keep the attachment strip. "manually" at the very end of the skirt, like I did. to get more precision - in that case you will get 15 sectors. This inner bag portion typically has holes punched in it to allow air supplied by the lift fan to the bag region of the skirt to pass from the bag region to the finger region and finally to the main cushion. The skirt is in excellent condition and skirt patterns are included to make new future skirts. From this single shape, you can design all the corners templates you need, so be sure to save it or copy it. The Hovercraft began its life in 1955 when British engineer Sir Christopher Cockerell tested out his idea for a floating craft using a stream of air to create a cushion After fine-tuning his designs, he secured funding to build a hovercraft and Saunders Roe, the flying boat company at Cowes on the Isle of Wight was given the contract. Control of the motion of the constructed hovercraft model. Each of the inner bag panels in a multi-panel tiled arrangement in accordance with embodiments of the present invention may have a drooping trailing edge. Chris Fitzgerald inspecting results to determine what additional tests should be performed. Whilst combined bag and finger skirts offer advantages over both bag skirts and finger skirts, the location of the fingers under the bag region of the skirt, and the presence of the inner bag portion, make it difficult to access the tops of the fingers when they are to be removed for repair of replacement. Each panel may also be attached, as with conventional arrangements, to the bottom edge of the outer bag portion and to the hull at its inboard edge. Figure 1. We use reinforced rubber offering great resistance to abrasion. google_ad_width = 728; google_ad_client = "ca-pub-8402110602011712"; Finger Skirt: This design is more complex than the bag skirt. Neoteric hovercraft skirts feature an inventive quick-change system that allows you to replace skirt segments in the field without the need for any tools whatsoever. A skirt for a hovercraft, the skirt comprising: a bag section for attachment to the hull of the hovercraft; and a plurality of fingers extending downwardly from the bag section; wherein the bag section includes an inner bag portion forming an interface between the bag section and the fingers; the inner bag portion being formed of a plurality of panels that are arranged side-by- side along the length of the skirt, the panels extending over the top of the fingers and the fingers being attached to the panels.