Small craft, such as the SR.N6, usually have one engine with the drive split through a gearbox. A hovercraft skirt is required Hovercraft Skirt: Duplicate Paper. the required hoverheight. Spinners. Take the hovercraft hull upside down. enlarge the following pictures by right-clicking on them and select "open in a new tab" or "display image". We are aware that commercial operators require minimum costs and downtime in order to ensure profitability, and our refined manufacturing methods offer the most economically viable option for the running of Air Cushion Craft. Need help with plans or your build? Therefore, you will need to use two different templates for the right and left sides of these skirt pieces. Join the dots, and voil, you have your template, ready to be reproduced on a piece of cardboard. 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. google_ad_slot = "9941476513"; With a compass, measure the length of the arc marked in red. Hovercraft Consultants Ltd was founded, specialising in hovercraft skirt design. The bag section (26) includes an inner bag portion (28) forming an interface between the bag section (26) and the fingers (22). Draw a horizontal line above the last dot that was drawn and repeat the process to get your second mark. We also sell Vanguard/Surveyor complete skirts that only need to be installed. or graph paper. Special thanks to Ian Smith, who created a large part of this tutorial, for giving me the authorization to improve and republish it. Draw a corner above like shown. that will fully satisfy your specifications. Best suited to multi-terrain cruising hovercraft. 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. pencil, graph paper, or drawing software like Geogebra, truck tarpaulin (density of 600g per square metern, must resist to stretching lengthwise and widthwise), something suitable for cutting out this truck tarpaulin (very good scissors or a very good cutter, I guess), large pieces of cardboard to reproduce your skirt templates on. You have a project or a problem to solve ? I will demonstrate the following steps with a RC hovercraft skirt made with trash bags. In this case, for a RC hovercraft, we will set two strips under the hull first. The newer skirt designs dont spray as much water as the old ones do. If you used it to make your own skirt, please post a picture, it will be a great reward for my work :-). 2 and 3 the illustrated example two finger top edge attachment points 48 to the trailing edge 50 of the associated inner bag panel 40 are additionally provided (in other examples there may only be one of these top edge attachments, more than two, or none at all). The two videos below show two skirts made with this tutorial - one for a RC hovercraft, the other for a homemade hovercraft, the Rusalka. This is why we don't need skirt attachments for the front nor for the rear. (not shown). Mainly a diesel engine in the mid-rear part drives the propellers. When joined together by soldering or sewing, this part of the skirt will have an angle of 90. Musthane manufactures hovercraft skirts to your specifications. The craft is propelled forwards by one or more propulsors mounted on top of the hull. Ensuring the movement of military troops in hostile areas Rescue of people in hostile water areas Transport of heavy equipment in swampy or glacial areas. Hovercraft are hybrid vessels operated by a pilot as an aircraft rather than a captain as a marine vessel. 4. Solid metal hovercraft skirts. New segments slide into a special slot along the craft's edge without the need for mechanical fasteners, which enhances the Hovercraft's sleek, agile appearance. Keep in mind a few things. 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. You finally have your custom vented bag skirt set on your hovercraft / RC hovercraft. The pressurized air, supplied by the lift engine, enters the skirt through ports in the side of the hull and exits via a . pressure on the collapse of the skirt to provide stability, ie., when The figure includes a view of an inner bag panel shown laid out flat and a section through the attachment at the finger top edge; and. Then, we draw the first dot of the template : draw a horizontal line joining the beginning of the skirt to the diagonal drawn previously, and from there draw a right angle to join the horizontal line of the corner. Draw two horizontal and vertical axes which pass through the center of the semi-circle drawn previously. 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). 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. The space between two lines, noted X on the drawing, is calculated from the following formula : (/180) r. In this example, = 22.5 because we divided the semi-circle in 8 equal sectors, and r = 3 because the semi-circle radius is 3 cm. Our team of experts will get back to you as soon as possible. Discussion in 'Boat Design' started by rubenova, Jun 23, 2017. A bag skirt can be thought of as being formed from a continuous tube (e.g. The forward end 42 of each panel overlaps on top of the aft end 44 of the adjacent panel by about 100% at the inner hull attachment reducing to little or no overlap at the attachment to the lower edge of the outer bag 20. An anti-scoop flap in the rear segments prevents them from filling with water while getting over hump. A1. The black one, as it has four different angle values, will require four templates and four times more calculations. The hovercraft is an Air Cushion Vehicle (ACV) that flies above a land or water surface on a cushion of air. 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. Just remember to use the correct templates for each different angle value on your hull, and to use the length corresponding to the hull side. In addition, the invention is intended to improve the flexibility of the skirt bag. Note that the diagonal musn't come too close to your semi-circle, draw your vertical axis accordingly. to fulfill the following functions: There are several major designs of hovercraft skirts but This is best suited to light racing hovercraft due to its low co-efficient of drag. moving the centre of lift pressure over and tending to raise the craft Chris Fitzgerald inspecting results to determine what additional tests should be performed. We can accommodate 16 foot hulls with the cut out and complete versions. By using this site, you agree to its use of cookies. or jack-up the craft. Draw a horizontal line that represents your hovercraft hull. Advantageously, this can mean that the finger can be removed with its own section of inner bag panel still attached. Combined bag and finger skirts typically comprise an "inner bag" portion underneath the craft at the interface between the bag portion and the finger portions. As you can guess, the longer sides will be sticked on the edges of the hovercraft hull, while the smaller sides of the skirt will be sticked on the attachment strips (except for the front and the rear which have no attachment strips as I explained earlier). be developed in a similar way. Hoverworks of Parry Sound, Ontario hopes to improve matters with its AirRider hovercraft, which uses a hybrid hull and skirt design that combines the best of conventional hovercraft technologies . Joined together, these weird parts will give the hovercraft skirt that characteristic cylindrical shape. 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. Divide the semi-circle into 8 equal circular sectors, each one being 22.5. And while they might not be ubiquitous, hovercraft catch. The skirt confines the pressurized air that supports the weight of the craft. The inner bag portion (28) is formed of a plurality of panels (40) that are arranged side-by-side along the length of the skirt (10), the panels (40) extending over the top of the fingers (22) and the fingers (22) being attached to the panels(40). segments may be used in any location on your hovercraft's skirt. 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. And as it has 8 sides, it will require 8 pieces of skirt to cut and join together. It is not useful to do the same at the front of the hovercraft. Now that you have all your templates, you need to cut skirts pieces with the right dimensions. Then, you need to choose what your hovercraft hull will look like. Various variations and modifications to the specifically described example are possible within the scope of the invention. Join the end of the semi-circle to the end of the attaching strip with an arc. Bean Bag Chair. Whatever the value of the angle on your hull, divide it by two and use this result to draw the diagonal as shown.