STEF
The length of the small polyethylene float from Methodius is 4500 mm, width – 400 mm, height -300 mm. The contours resemble the classic rounded shapes of a kayak, the bow and stern are symmetrical. There are longitudinal and transverse grooves for docking with the catamaran bridge. Float volume (total displacement) -0.28 m3, weight – only 18 kg. The load capacity of the float can be calculated as 0.5 * (280 kg – 18 kg) = 131 kg. Not much, but if you build a bridge correctly, remembering what we were taught at the Moscow Aviation Institute, you can get a good and very light two-seater motor catamaran.
First you need to decide on the sizes. The floats must be spaced as wide as possible: according to our formula, with L = 4500 mm, the distance between the bodies must be at least 1620 mm. However, there is another “introductory” one – the width of the top trunk of a UAZ car is 1500 mm. This means that the bridge will be exactly the same width, and the distance between the floats will have to be chosen the same way. The length of the cross beams can be slightly longer – up to 1800 mm across the overall width of the machine. The length of the bridge is determined from the experience of operating a planing catamaran: for a two-seater vessel, 1700 mm is quite enough.
To facilitate assembly and transportation, it is important that the weight of the assembled bridge does not exceed 25-30 kg. Its design for this should be the simplest: a transverse power beam that carries the entire load, and a light flooring. Bakelized plywood FBS-1 is best suited as a deck material. It is characterized by maximum water resistance, since during its production the veneer is impregnated with phenol-formaldehyde resin (bakelite varnish) before gluing. However, the dimensions of a standard FBS sheet are 2500 x 1250 mm, which does not make it possible to obtain a flooring from one sheet and will require reinforcement and weighting of the joint. For the same reason, and also because of the increased density compared to plywood, fiberglass sheets were rejected. There is another very interesting material on sale – wood-laminated plastic DSP-10 (not to be confused with particle board, which is correctly designated DSTP). This is nothing more than the famous delta wood, from which LaGG-3 fighters were built during the war. I was inclined to choose this particular material, but it turned out that in our “coronavirus” times we have to wait for more than one month for its delivery, which did not suit me at all. All that was left was the limited waterproof FSF plywood. It is also glued together with phenol-formaldehyde resins, but without preliminary impregnation, unfortunately. But it is produced in large sheets of 1500 x 3000 mm.
Amateur shipbuilders recommend using at least 5 mm for the thickness of plywood sheets, so that you can walk on it; I took it with a small margin – 6.5 mm. So, we decided on the material and dimensions of the bridge: FSF plywood, size 1700 x 1500 mm, thickness 6.5 mm.
The cross beam must bear the entire load, including the weight of two people. The best material for lightweight load-bearing structures has been and remains D16T duralumin. The aluminum-magnesium alloy AMg6 is slightly inferior to it in strength. But it welds well and is not subject to corrosion in sea water. While I was thinking about the choice, it turned out that these materials had also become difficult to obtain: regular domestic duralumin profiles can only be purchased to order, and you have to wait until the fall.
For the same reason, it turned out to be impossible to purchase a widely advertised new product – a fiberglass profile. During the “knockdown” period, all manufacturers “downsized” and offer only fiberglass reinforcement, that is, a simple round bar.
We could only rely on what was sold in construction stores near Moscow. But there was only an AD31 aluminum profile. This construction alloy of aluminum with magnesium and silicon is sold under the trade name “avial”, but has nothing to do with aviation. In terms of yield strength, it is more than four times “weaker” than duralumin. Its only advantage is high plasticity.
But in shops and markets, high-quality lumber was sold in abundance – from the strongest larch to the lightest linden. The high price for my small needs – just a few bars and planks – did not matter much.
Thus, limited by the realities of the “pandemic era,” I had to make a mixed structure using a durable larch block and auxiliary parts from “plasticine” aircraft. However, it is very similar that during the difficult years of the war, this is exactly how airplanes were built and nothing happened – they fought off the enemy!
Possible materials for load-bearing structures (standard profiles)
Duralumin D16T | 2.7 | 412 | 284 |
Aluminum-magnesium alloy AMg6 | 2.64 | 314 | 157 |
Avial AD31 | 2.67 | 127 | 69 |
Fiberglass profile | 1.8 | 220 | — |
Larch tree | 0.68 | 97 | — |
Pine tree | 0.53 | 79 | — |
Linden tree | 0.49 | 53 | — |
The bridge has a plywood deck, a transverse power beam of mixed construction 1800 mm long and two similar, but lightweight cross-beams: bow and stern. The stern takes the pushing forces and weight of the outboard motor, and the bow is designed to mount a wave breaker, solar panel, auxiliary bow motor bracket or removable canopy, as desired. The wave breaker is made of monolithic polycarbonate 2 mm thick. The flooring is reinforced with four longitudinal linden boards, and the installation site for the outboard motor is reinforced with a 5 mm thick fiberglass slab. Small wheels are installed on the rear traverse for transporting the bridge to the catamaran assembly site. The entire structure is assembled with screws and screws and glued with epoxy glue.
The mass of the assembled bridge was 29 kg. I thought it was too much for me and made the decking and cross beam detachable. Now the catamaran is loaded onto the trunk of the UAZ as follows: first, a deck with bow and stern crossbeams with a total weight of 23 kg is slid over, then a transverse power beam weighing 6 kg is attached to it, and then floats, each weighing 18 kg, are attached to it. Swivel chairs, outboard motor bracket, railing, oars with brackets for them, luggage lockers are used from the previous design (see “M-K” No. 1-2020). The total weight of the assembled catamaran without outboard motor was about 95 kg.
SOLAR CATAMARAN
The photo of the assembled catamaran shows that a 150 W solar panel is installed in the bow of the bridge – this is a gift for my anniversary, as well as a continuation of experiments with electric propulsion, which began with the construction of a homemade boat electric motor and a 300 W power supply for it (see ” M-K” No. 6-2020).
The motor is a 12-volt DC motor from an electric winch mounted on the “leg” of a Soviet Salyut outboard motor. The current source is a power and control unit with a starter-traction marine lead-acid battery with a capacity of 85 A*h and a stepless PWM power consumption regulator. In my free time from “sea duty,” the battery is used on my expedition vehicle as one of two starters.
You can see that the maximum power of a solar battery under ideal lighting conditions is approximately half the maximum power of an electric motor. This was done deliberately: the excess power of the electric motor is needed as a reserve for difficult driving conditions, such as strong crosscurrents or strong winds. In this case, the power deficit is made up by a buffer battery, which can be recharged in the parking lot from the same solar panel or from a gas generator. It is interesting that the designers of environmentally friendly large ships with electric propulsion, which are now becoming fashionable, came to the same conclusion: the maximum power of the propulsion system should be approximately twice the total power of the solar panels.
The mass of the solar panel with a charging controller and fastening elements is 17 kg, the power supply and control unit with a buffer battery is 21 kg, the electric motor itself is about 6 kg, that is, in total, the same as a good boat motor with a power of about 30 hp. Is such weight justified by the ability to cut through expanses of water without gasoline? Let’s check this in practice!
Unfortunately, the same restrictions that stimulated my creativity prevented me from conducting full-fledged tests on a long-distance hike. We had to use the body of water closest to the dacha as a testing ground. But, thanks to such a close location, over the summer I was able to try as many as two variants of multihulls with five different engines afloat and get the positive emotions from the joy of technical creativity necessary to improve immunity.
The first to water was a catamaran with a solar battery and a traction electric motor. The speed at a maximum power of 300 W was 6 km/h, with half a power of 150 watts – about 5 km/h. This is even a little more than the calculated one, which is explained, of course, with excellent hydrodynamics of floats. Testing for the swimming range was not carried out, since the length of the pond did not exceed 200 m. When a rather strong oncoming wind blew, the catamaran with its great sailing was driven into coastal reeds. They managed to get out of them only at the full power of the electric motor, and once again I was convinced that 300 W is a minimally allowable power for confident swimming.
What are the general impressions of the tester and passengers? In the sense of pleasure from silent movement is great! But … no dynamics! At the same speed, the catamaran moves on the oars, and it is very easy on the go, and rowing equally convenient both forward and back: everything is symmetrical. For calm rivers and small forest lakes, this version of the power plant has the right to exist. In addition, we recall that in many interesting reservoirs, such as, for example, Senezhskoye and Pleshcheev of the lake, the use of PLM internal combustion is generally prohibited. You can raise a sail, of course, but for its use it is necessary to be a yachtsman, and this is a separate caste of lovers of rest on the water. I like the motors more.
Having enjoyed plenty of silent and environmentally friendly pokatushki, I dismantled the solar power plant and put a homemade four -stroke engine with a capacity of 4 hp. And he was pleasantly surprised!
Without visible voltage, a very small motor dispelled the ship lightly up to 20 km/h, and with a full load of two people – up to 18 km/h. For comparison, the corresponding speeds on the launching catamaran and a small transubic boat were exceeded 12-15 km/h. Fuel consumption was a little more than 1 l/hour, which corresponds to a waybill of not more than 7 liters per 100 km. A great result is not only for the boat, but even for the car!
My favorite 1.5-horsepower motor with a wheelbuilder was tested (see M-K No. 12-2018). Its main advantage is the ability to move in the smallest and overgrown with aquatic vegetation places where it is difficult to even go on oars. True, the speed with such a power plant did not exceed the same 6 km/h. But even when the floats sat aground, the wheels, resting Plitsy on the ground, continued to push the catamaran forward.
Do the new catamaran revealed shortcomings? Of course, how without them! Firstly, its maneuverability is noticeably worse than that of a single-body boat, which is understandable: the float is quite long, and the application point of the vinting force of the screw is not far from the middle of the vessel. A more significant drawback is limited seaworthiness (although this is impossible to check in the country pond). After all, a vertical clearance at full load is only about 100 mm, and even the wave of the chopper will probably not save from strong spraying. Although for calm reservoirs and even for large rivers this is a completely reliable and easy design that does not require registration and management documents under our laws.
Having received as a whole positive results, experiments with a catamaran at this stage ended, and I moved to the construction of a more complicated, but also more promising crafts – Trimaran. I’ll tell you about him in the next issue of the magazine.
Grigory Dyakonov
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The Osprey is a Cruising Trimaran. LOA 16ft. Beam 10ft. Approximate stripped weight of main hull -90lbs. Approximate assembled and rigged weight -180lbs. Osprey is our most seaworthy, most comfortable, easiest to sail and fastest sailing canoe. It can be assembled and disassembled in about 10 minutes without tools.
Use: Convertible kayak/trimarans SEA PEARL. Best known for its use in camp cruising excursions, the Sea Pearl offers a roomy main hull and particular ability to sail in very shallow waters, making beaching and launching a breeze. The lightweight Sea Pearl trimaran is easy to tow, and the larger-than-expected cabin opens this vessel up for ...
This is a 16 foot Canadien design canoe rigged with a set of pontoons for fast stable sailing. The wide crossboard allows the canoeist the option of sitting ...
This trimaran is 24 feet long, sails fast, is easy to paddle, and easy for one person to control. ... Homebuilt Wa'apa sailing canoe built with local materials. This trimaran is 24 feet long ...
Design, construction, and material information about small trimarans: Design Criteria, Construction Methods, Comparisons of Designs, Speed, Stability, ... Looks like this sleek boat with its asymmetrical amas and deep fine bow, should ride the waves with minimum disturbance and maximum dryness. Va être un superbe bateau!
Video and edit by Daniel Caselli - Uruguay. The drop in outrigger can transform many unstable canoes, narrow dinghies and some kayaks into a stable platform for fishing or diving or convert your boat into a formidable sailing outrigger or trimaran sailing canoe.. Turn a Canoe or Kayak into a formidable sailing boat or a super stable fishing platform.
The new "Mini Trimaran" as it is being called (for now) is an evolution of our work in small multihulls over the years. It combines elements of the successful Expedition Sailing Canoe and the "kayak trimaran" named 'Spongebob' into a new vessel.Hull #1 was cut out as a CNC kit in July 2020 and is now in the process of going through sea trials.
Key moments in this video:0:20 Hull1:38 Sail and mast3:52 Floatation and capsize recovery5:04 Floats/amas/outriggersVideo: Thanks to Hubert, Klarie, Marten J...
Trimaran sail trim. One of the biggest differences between a cruising monohull and a multihull is how the mainsail is trimmed. Leech tension on a yacht is often largely controlled by the kicker and the backstay, while the mainsheet sheets the mainsail in and out, predominantly controlling the angle of the boom to the centreline, and there may be a short traveller.
When the wind blows, the Tandem Island flies across the water, powered by an expansive, easily tended mainsail. Hop aboard with a friend. With dual MirageDrive 180s providing forward and reverse pedal power, maneuvering is a snap even when the zephyrs subside. Our patented Kick-Up Fins automatically "kick-up" on contact with an underwater ...
Like other trimarans under the Dragonfly brand, this 25-foot (7.62-meter) trimaran is great for both racing and short term cruising. However, this high-performance boat delivers easy handling, making it perfect for couples looking to take a ride out over the weekend and seasoned sailors looking for an exhilarating racing adventure.
The all-new Dragonfly 40 is a cutting edge design with focus on easy handling and shorthanded sailing. Spacious cockpit and a stylish, modern interior. Setting new standards for comfortable and safe family offshore sailing. World Premiere boot 2020 Düsseldorf. The Dragonfly 28 sets new standards for the possibilities of a sailing boat.
USA-17—a 90-foot-long (27 m) trimaran, type BOR90. A traditional paraw double-outrigger sailboat from the Philippines. A trimaran (or double-outrigger) is a multihull boat that comprises a main hull and two smaller outrigger hulls (or "floats") which are attached to the main hull with lateral beams. Most modern trimarans are sailing yachts designed for recreation or racing; others are ...
Manufactured by a variety of yacht building companies, there are currently 149 trimaran yachts for sale on YachtWorld, with 50 new vessels for sale, and 99 used and custom yachts listed. These vessels are all listed by professional yacht brokers and boat dealerships and new boat dealers, mainly in the following countries: United States, France ...
Trimaran. Ideal for overnight cruising and day sailing these Trimaran boats vary in length from 17ft to 78ft and can carry 4 to 15 passengers. There are a wide range of Trimaran boats for sale from popular brands like Corsair, Neel and Dragonfly with 56 new and 121 used and an average price of $223,631 with boats ranging from as little as $10,650 and $1,798,691.
Discover our range of trailerable and foldable trimarans suitable for regatta racing and family cruising. The worlds favorite tailerable trimaran builder, suited to day sailing, family cruising and racing. ... Corsair 880 Trimaran | 2022 Boat Review by Multihulls World. Read Article. Corsair 880 - Drive Out, Fold Out, Thrill Out, Chill Out.
Boat shows. Reviews. Contact. LEEN-TRIMARANS. NEEL-TRIMARANS GROUP. NEEL OWNERS COMMUNITY. Receive an offer. Rent a NEEL. NEEL 43. NEEL-TRIMARANS ... NEEL-TRIMARANS has confirmed its determined commitment to respecting the environment. DISCOVER NEEL 43 PERFORMANCE. GALlERY. Photos and videos. Sailing Exterior Interior Life Style Videos 360 ...
A NEEL trimaran, the perfect sailing boat for an unforgettable adventure. NEEL-TRIMARANS and its dealer network are organising the PRIVATE DAYS in La Rochelle from March 2, to March 4, 2023. NEEL 43 elected among the top 10 boats of 2023 by SAIL Magazine. The latest Lombard-designed addition to the range is even more innovative and impressive ...
Trimaran sailing vessels are manufactured by a handful of boat builders with hull types including trimaran designs. These sailboats have a minimum total sail area of 645 square feet, a maximum total sail area of 2,077 square feet and an average of 1,361 square feet.
3. 365AltaiMongolia. 4. SUP spot Moscow. 5. Planeta Vozmozhnostey. Top Moscow Kayaking & Canoeing Activities: See reviews and photos of kayaking & canoeing in Moscow, Russia on Tripadvisor.
FROM CATAMARAN TO TRIMARAN. 09.05.2024 Design. In my previous article (see "M-K" No. 12-2019 and 1-2020 ) I talked about the experience of building and operating a collapsible planing catamaran of the Craig Cat type. Such a craft can be equipped with a 12-15 hp motor. and a crew of two people go on plane and joyfully move at a speed of 30 ...
Trimaran For Sale By Owner - 2006 Corsair Sprint 750. Location: yankton, sd price: $34,900. Contact Owner's Representative [email protected] 2006 Corsair Sprint 750. Model yea
Listed below are the canoe sprint world best times in Sprint canoe and Sprint kayak events. The ICF only acknowledge world best times set in finals of Olympic Games, World Championships, World Cups, Continental Championships and "other canoe sprint events with acceptable high technical level". [1]