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PERSONAL TRANSPORT: GROUND, WATER, AIR
On floats - with a motor. Personal transport
Directory / Personal transport: land, water, air We usually spend our holidays at the Ivankovskoye reservoir in the upper reaches of the Volga. We are two families: mine and my friend. We put cars in the cold, break tents, launch inflatable boats. While our wives and children are sunbathing, gathering mushrooms and berries on the islands, my friend and I are catching, drying and smoking fish. This is how we spend our entire vacation. Everything would be fine, but here's the inconvenience: every day you have to transport wives and children to the islands. And at one time in a small boat you can’t take everyone away. While there, while here - half a day goes away. Yes, and the hands from the oars are burning. So I came up with the idea to build something more impressive than an inflatable boat, which has more speed, but at the same time retains its main advantages - lightness and compactness. So there was an inflatable catamaran with an outboard motor.
When cutting the shell of the float, its length was increased from three to four meters (Fig. 1). There was no durable synthetic fabric, so I used what was at hand - "silver". Taking into account the allowances for the seams (40 mm per side), I cut out two panels according to the theoretical contours for each shell and sewed them on an ordinary sewing machine with an overlap with strong nylon threads. I made chambers for floats from medical oilcloth according to the same theoretical contours, increasing all dimensions by 5%. I did not sew the panels, but glued them securely with the "Moment" overlap. I glued the seams from the inside with strips of rubberized fabric, and on the outside I covered the chambers with two layers of rubber glue and powdered with talc.
Approximately in the middle of the shell, on top, I made an opening (Fig. 2) with lacing, reinforced with boots - glued and stitched overlays of rubberized fabric. Through this opening he pushed a slightly inflated camera. Then he tightened the lacing, and pumped up the chamber with air to the norm.
The valve through which the chamber is filled with air (Fig. 3) completely repeats the design of V. Popovich. It is assembled from a duralumin case with eight holes, a membrane with a rubber gasket, a steel spring, a plug rolled along the bottom of the case and a hermetic cover. The valve body is fixed to the chamber with two washers lubricated with rubber glue and a tightly tightened nut.
The float pump (Fig. 4) is also homemade. It consists of a plywood cover and bottom, to which a bag is attached with the help of pine slats, Moment glue and screws - a cylindrical chamber made of medical oilcloth. A belt is fastened to the bottom of the pump with screws, which has two purposes: for packing the pump and holding it (by feet) in the working position. The pump cover has an inlet with a valve and an outlet pipe. The latter is connected to the float valve by a hose - a cut-off bicycle chamber. To fill the bag with air, you need to put your feet on the ends of the belt, pick up the pump cover and pull it up. At the same time, the thumbs of the runes press the bolts, that is, they keep the valve open. When the bag is full, the bolts should be released (close the valve) and press on the pump cover - air will rush into the float with noise. A minute or two - and he is pumped up.
A bridge is installed on the floats (Fig. 5) - a collapsible structure made of duralumin pipes connecting the floats. Each transverse beam of the bridge is made of two duralumin pipes with a diameter of 38x1,5 mm and a length of 1 m, connected by couplings - segments of a duralumin pipe with a diameter of 35x2 mm and a length of 300 mm. One end of each coupler is epoxy-glued. A central beam is attached to the transverse beams below, consisting of three duralumin pipes: bow (30x1 mm in diameter and 900 mm long), middle (32x1 mm in diameter and 800 mm long) and aft (30x1 mm in diameter and 800 mm long). Between themselves, the pipes of the central and transverse beams are pulled together with self-made screws - lamb and clamps, curved from sheet duralumin 2 mm thick. Self-made duralumin bushings with M8 thread, the heads of which are riveted in the holes of the clamps, also serve as nuts. All stringers are cut from duralumin pipes and have the same length (1 m), but different diameters: bow and stern - 30x1 mm, medium - 32x1 mm. Stringers with riveted M8 duralumin nuts are fastened to the transverse beams with long wing screws. A stop is fastened to the stern pipe of the central beam with a narrow tape of fiberglass on epoxy glue. It is designed to hold the crossbar of the motor trolley when installing it on a catamaran. The stop is curved from a strip of stainless steel 114 long, 15 wide and 3 mm thick.
A deck is put on the bridge (Fig. 6) - a large rectangular panel of strong and dense synthetic fabric, preferably rubberized. The front and rear edges of the panel are turned up, glued and stitched with nylon threads so that they form pockets for the bow and stern cross beams. The pockets have through holes for thumbscrews, cut in place and reinforced on both sides with bows - glued and stitched with rubberized fabric ring linings. The side edges of the panel are reinforced with double glued and stitched overlays made of rubberized fabric. From above, 18 brackets are sewn to them for deck tension on stringers. The staples are curved from strips of duralumin 3 mm thick and sewn to the cloth with thick copper wire. So that the wire does not fray over time, the holes in the brackets are countersunk, and the sharp edges are rounded off with a file. The stretched deck is a spacious area, enough to accommodate our entire family (two adults, two children and a dog) and a fairly voluminous luggage. Despite their dimensions, the floats, the bridge and the deck in the packed (transport) state fit into rather limited volumes: the bridge fits in a cloth case measuring 1150x150x150 mm with a suitcase handle, and the floats, deck and pump - on a trolley, akin to the one with which the elderly people go shopping. In addition, the trolley also accommodates the catamaran engine - the Salyut outboard motor.
The trolley (Fig. 8) is self-made (except for the wheels from the baby stroller), since it serves not only to transport parts of the catamaran, but also to mount the engine. It is made of steel chromium-plated pipes with a diameter of 16x1,5 and 10x1 mm. Instead of a cargo platform, she has a powerful transom, to which the engine is attached with its clamps in the working position. The transom is a package of plywood liner and aluminum edging, connected by five rivets. One end of the transom is put on the axle of the wheels, the other is attached to the lower bend of the frame (M6 bolt). A part of the edging goes beyond the dimensions of the insert and forms a lodgement into which the trolley handle is placed when it is released and rotated around the axis of the crossbar. This is done when preparing the trolley for installation on a catamaran. In addition, the trolley has a bump stop to protect the engine from water jets when the catamaran is moving. It is made from rubberized fabric. Its upper edge is bent, forming a pocket for the crossbar of the trolley, glued and stitched with threads, but not completely: openings for cargo belts are left in two places. A duralumin insert with hooks is glued into the lower edge of the bump stop.
In the working position, when the trolley is placed on the bridge of the catamaran and its handle is turned and rests in the lodgement, the bump stop is stretched between the crossbar and the manual one and is hooked to the latter. In the transport position, when the trolley is loaded to the top, the bump stop is disengaged and rests on the belts, serving as a bed for the load. The straps (there are three of them) are made of rubberized fabric and stitched with nylon threads. When assembling the cart, one remains on the handle, the other two are passed through the openings of the bump stop, and then, together with it, the upper ends are put on the crossbar, and the lower ends are put on the wheel axle. So, the catamaran meets the given requirements: it is structurally simple, light (one person can easily carry it), compact (takes up little space in the apartment and in the car), quickly assembled and disassembled. The assembly sequence is as follows. First, the floats are inflated. Then the bridge is assembled: all its elements are connected, except for the bow and stern transverse beams, and the bridge is covered with a deck. The transverse beams are dragged through the pockets, screwed with "lambs" first to the stringers, and then to the central beam. Now the deck is slightly stretched. Staples cling to the stringers, and the deck is finally stretched so that it resembles a trampoline. The bridge is attracted to the floats by six wide bandages (Fig. 7), the ends of which are passed through the slots of self-made aluminum holders. The bandages are cut from the same material as the shells of the floats. Then the clamps on the trolley are released, it is folded, inserted with a crossbar into the emphasis on the central beam, and its clamps are put on the transverse pipe of the norm. The clamp nuts are tightened and the cart is securely attached to the bridge. Everything, the catamaran is assembled, you can take it to the shore. Already on the water, the engine is put in place and a five-liter gas tank, soldered from sheet brass, is attached to it. Author: G.Smirnov
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