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Professional offshore Cargo Ribs (prices, models and specifications on request) Using well proven designs, the best of materials and the lastest technology, a range of crafts is produced to suit any user. Madera Ribs is acknowledged as expert in the installation of complex propulsion systems, including diesel & petrol inboard engines with water jets or stern drive propulsion systems and single, double, triple and quadruple outboard engines. All designs are put through vigorous preproduction and customer acceptance test programmes. Our crafts are produced to comply with the following standards: - The Marine Safety Agency (MSA) of the UK Departement of Transport (DoT), approval for fast rescue craft for use in the North Sea oil and gas industry.
- Intenational Conventions for Safety of Life at Sea (S.O.L.A.S)
- U.S. Coastguard Requeriments
- Classification Society DET NORSKE VERITAS Requeriments.
- European Community Directive for Recreational Craft (94/25/CE).
Madera Ribs inflatable boats are built following the requirements of the ISO9001 quality assurance system. All materials used in the construction are certified by the classification societes, specially by the prestigiuos norwegian society DET NORSKE VERITAS and its rules for the construction of boats under 15 metres. At any moment, in the design stage or during the construction or test process, Madera Ribs staff work following professional criterias. Our boats comply with the European Community Directive for Recreational Craft (94/25/EC).
The rigid hull of the boat is made from a GRP (glass reinforced plastic) hand lay-up.
This is a composite material consisting of layers of glass fibre mat impregnated with polyester resin. Isophtalic resin and powder bonded mat are used in the layer next to the gel coat to avoid water penetration through the hull over prolonged period of inmersion. GRP is also non corroding and invulnerable to attack from marine organisms. Transom and deck are made from certified marine plywood laminated with GRP. Both, deck and transom, form part of the structure and they play a very important role in the strength of the hull. The hull skin is reinforced with longitudinal and transversal bulkheads made from a sandwich laminated of closed cells foam and GRP. Longitudinal bulkheads and stiffners are laminated first and on top of them are laminated the transversal bulkheads. The transition between the transom and the longitudinal elements is made by means of knees. This system allows the right transition of forces between the transom and the rest of the hull. The deck is supported by the longitudinal bulkheads and it is laminated with GRP to the bulkward and the tube carrier. A special sandwich structure of marine plywood and GRP is built in the bow area to increase the strength of the hull and the bonded surface between the tube and the hull. This part is prefabricated from an external mould and later laminated to the hull and the collision bulkhead. By means of this system is created a small bow deck and an ideal bow locker for the anchor and the mooring equipment.
Longitudinal and transversal bulkheads allow the definition of a certain number of areas and waterproof compartments. These waterproof compartments increase the survival capabilities of the boat. All boats are designed with at least four (4) waterproof compartments. Decks are provided with acrylic and bailey hatches to be enable to access the compartment for maintenace operations. For commercial customers and boats with a high risk of getting aground, Madera Ribs proposes the instalation of the keel protector TREKOLLAN. Trekollan is a urethane-elastometer used for many years in the mining industry for severe impact and abrasion aplications. The material has physical properties similar to rubber, however friction is lower and the abrasion resistance and overall strength is higher. During trials impact tests were carried out using various thicknesses of the material. The results were virtualy no damage at load levels that buckled 6 mm stiffned aluminium plates and that penetrated thick glass/kevlar hybrid laminates. The Swedish Naval Authorities and Madera Ribs have devised a method to totally integrate the Trekollan into the keel to provide the ideal solution to withstand impact loads and abrasion to the bottom of the boat. Unlike stainless steel keel protection damage to the GRP hull beyond the keel protection does not occur.
Tubes are made of "Hypalon" impregnated and coated nylon material of 1200 or 1500 grammes per square metre weight.
Hypalon is very tough and is resistant to ultra-violet radiation, ozone, petrol and oil. Rubber fendering, grab handles, lifelines and securing points are glue to the tube with a very strong, long lasting adhesive. Tubes are arranged in several independent compartments. Each one is inflated through its own valve. Valves are made of Delrin plastic and both the diaphragm and cap seal provide the airtight capability of the valve. Each compartment is also fitted with a relief valve to avoid high pressure.  | 1 | Independent compartement of the neumatic tube | | 2 | Independent compartement of the neumatic tube | | 3 | Independent compartement of the neumatic tube | | 4 | Independent compartement of the neumatic tube | | 5 | Independent compartement of the neumatic tube | | 6 | Bilge well | | 7 | Central compartment of the hull | | 8 | Lateral compartment of the hull | | 9 | Collision bulkhead | | 10 | Draining pipes |
Two kind of fuel tanks are available:
Structural tank under deck This kind of tank is produced by means of the distribution of longitudinal and transversal bulkheads. The fuel tank top is laminated to the bulkheads parallel to the deck at a distance enough to create a comunication trunk for the fuel and ventilation lines. The lay-up of the GRP material in contact with the fuel is based on acid resistance resins. Fuel tank are provided with transversal and longitudinal baffles made of laminated GRP in order to reduce the free surface of the fluid inside the tank. At the rear of the tank there is an inspection hatch with fuel lines intakes and the level sensor unit. The fuel filling point and the ventilation pipe are located at the front of the tank. Madera Ribs has a very long experience in the construction of structural tanks and we can face any special requeriment from customers with a very high level of specification. Structural tanks allow the definition of bigger fuel capacities. Prefabricated inox tanks They can be located under or above the deck. The tank above the deck is located under the console and it is laminated to the deck with GRP. The tanks under the deck are built to fit inside the hole defined by the longitudinal and transversal bulkheads. All tanks are tested under pressure to check its strength. At the rear of the tank there is an inspection hatch with fuel lines intakes and the level sensor unit. The fuel filling point and the ventilation pipe are located at the front of the tank.
The draining system pumps out the water loaded on deck by the sea waves or raining. It also allows the draining of the water loaded after a collision or after getting aground.
Each waterproof compartment is connected with the bilge well trough a screw type drain plug. The bilge well is located at the rear of the boat, next to the transom or at the bottom of the engine room. Electrical or manual bilge pumps move the water out. Electrical pumps are fitted with an automatic flooding switch. Water loaded on deck is also drained by effect of the gravity (natural stern trim) and the movement of the boat through two holes cut out on the transom at deck level. Two elephant trunks are fitted to avoid water coming in through the holes.
Madera Ribs has several console models to fit with any customer requeriment. The final console type to be used depends on the following data:
- Number of seats and arrangement
- Quality and type of seats
- Number and type of engines and the type of control and steering system
- Electrical and electronic equipment
- Pilot and crew protection
- Waterproof compartments
- Inhabitable cabin The console is located midships and the longitudinal position is defined to get the best and comfortable driving position. The deck holes for fuel and ventilation lines of an underdeck tank are defined inside the path of the console to avoid water coming in below the deck. Console is fitted with waterproof hatches to access the connections of the fitted equipment. The Aerials of the electronic equipment and the navigation lights are located on a marine quality alloy A-frame. The A-frame is properly fixed to the deck.
Madera Ribs thinks that the fuel system is a very sensible component of the boat and it has to be properly designed to assure it is going to work under high dynamic and hard atmospheric conditions. The fuel system is designed following the criterias of the DET NORSKE VERITAS and the rules derived from the European Community Directive for Recreational Craft (94/25/EC).
All system components are certified and they are assembled employing the highest professional standard and following our continuous experience with this kind of boats. The fuel system could be composed by the following elements: - Structural tank under deck
- Prefabricated tank under deck
- Prefabricated tank above deck
- Fuel lines from the tanks (one per engine and tank) to the change over valves located at the console.
- One fuel line from the change over valve to the engine
- See through water separators & fuel filters to check fuel contamination.
- Flowscan computerised fuel monitoring system. It enables the pilot to know exactly how much fuel is in the fuel tank.
- Oil tank for two stroke engines. The oil tank could be supplied by the engine manufacturer or could be a high capacity special tank designed by Madera Ribs.
At sea the electrical system of an offshore boat has to work under very aggressive conditions. The working conditions could only be faced with a correct design and the use of the best marine quality materials and components.
Madera Ribs designs the electrical system following the standard regulations but we also use the incredible amount of experience that we have got during all these years building offshore inflatable boats. The electrical system is always designed thinking of its maintenance (all components are marked) and the instalation of future extra equipment. A complete electrical and electronic system could be composed by the following elements: - Batteries
- Battery connection box with high quality switch breakers
- Engines (Starting engine, alternator and ground)
- Ground connections box
- Waterproof fuse box
- VHF radio
- 12 V cigarette lighter connector
- Radar
- GPS/PLOTTER
- Ecosounder
- Fuel monitoring system (computer)
- Compass
- Fuel monitoring system (sender unit)
- Navigation lights
- Engine room light
- Cabin light
- Electrical bilge pump
- Electrical fuel pump (diesel)
- Instrument lights with dimmer switch
- Automatic flooding switch for the bilge pump
- Waterproof switches box
Madera Ribs specialize in the professional fitting of propulsive plants. Our boats could be fitted with the following systems:
Outboard engines of two or four strokes Engines are very well fitted to the transom to be able to bear with the very high loading conditions these engines are going to work for. The cavitation plate is located respect to the hull level at transom to be able to get an optimum speed. In the case of a double or triple engine installation all engines are fitted as closest as possible to improve the propulsion efficiency of the group. Madera Ribs fits mainly YAMAHA outboard engines. Diesel inboard engines Diesel engines require a vey specialized and expertised design and installation to get optimum working conditions. Diesel engines could be coupled to the following propulsion systems: Transmissions Z-drive
Madera Ribs suggests the installation of YANMAR diesel engines and MERCRUISER Bravo-1 and Bravo-2 Z-drive. Waterjet propulsion
Madera Ribs suggests the installation of YANMAR diesel engines and HAMILTON waterjets. Surface propellers propulsion
Madera Ribs suggests the installation of YANMAR diesel engines and surface piercing propulsion systems.
The manoeuvrability of a very high speed boat is one of her most important safety elements.
With a proper manoeuvrability the pilot could react quickly when the boat is close to an object, avoiding the collision. The quality of materials and its way of fitting for a very high speed boat (around 50 knots) need to met a very tight standard. The system has to be sensible enough to allow a quick reaction but at the same time has to be steady. The system has to provide: - A quick and reliable transmission of pilot actions. Pilot also needs to have the feeling of the reaction of the system to his actions.
- The weight distribution of the boat has to be equilibrated and arranged to get the right position of the centre of gravity. Madera Ribs fits its outboard engines units with hydraulic steering systems, SEASTAR. These units have proved to be very reliable. Inboard engines units (diesel or petrol) with Z-drive propulsion systems are fitted with flexible cables TELEFLEX working on the power unit of the propulsion body. Madera Ribs gives a very special attention to the ergonomics of the driving position and introduces the continuos experience of our customers. Look here for rigid inflatable boats information page
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