Sylvie Willis
Helicopters, like the AW101 Merlin and CH-47 Chinook, have fuel tanks in different locations. Auxiliary fuel tanks, which increase the helicopter's range, are typically found in the fuselage, or main body, of the aircraft. This location helps maintain balance and stability during flight by ensuring optimal weight distribution. It also reduces the risk of fuel leaks in sensitive areas, enhancing overall safety.
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What You'll Learn
Fuel tanks in helicopters are usually located in the fuselage
The placement of fuel tanks in helicopters is crucial for safety and performance. Fuel tanks in helicopters are usually located in the fuselage, or the main body of the aircraft. This location helps balance the weight of the helicopter and minimises the risk of fuel leak incidents.
For example, in military helicopters like the CH-47 Chinook, auxiliary fuel tanks are installed in the fuselage. This allows for extended missions without compromising stability or safety. The weight distribution provided by fuselage placement is crucial for stability during flight. If the tanks were located in the cockpit, cargo area, or tail section, the aircraft's performance could be affected by an imbalance.
The AW101 Merlin helicopter also has underfloor fuel tanks. These tanks feed the engines via fuel pipes and a common fuel gallery. The location of these underfloor tanks within the aircraft is not specified, but they are likely placed in the fuselage for optimal weight distribution.
Placing the auxiliary fuel tanks in the fuselage also reduces the risk of fuel leaks in sensitive or congested areas, such as the cockpit or cargo area. This further enhances the safety of the helicopter. Overall, the fuselage serves as the best location for fuel tanks, as it maximises functionality, stability, and safety.
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The fuselage is the main body of the helicopter
The fuselage typically contains the fuel tanks, which are often located underneath the floor of the cabin area. These fuel tanks supply fuel to the engines through a network of fuel pipes and a common fuel gallery. The specific configuration of the fuel system can vary depending on the helicopter model, such as the AW101 Merlin, which has underfloor fuel tanks.
The fuselage also accommodates essential mechanical and electrical systems, including the transmission, gearboxes, and control linkages. It is designed to withstand the forces exerted by the main rotor and tail rotor, ensuring the helicopter maintains its structural integrity during various flight maneuvers.
Additionally, the fuselage plays a crucial role in housing the avionics and instrumentation required for flight operations. This includes navigation equipment, communication systems, and flight control instrumentation. The design of the fuselage aims to provide optimal visibility for the pilot, ensuring a clear field of view during different flight conditions and maneuvers.
Overall, the fuselage is an essential component of a helicopter, integrating functionality and structural integrity. Its design considerations encompass aesthetics, aerodynamics, and the accommodation of critical systems necessary for flight operations.
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Fuel tanks are designed to increase fuel capacity
The location of a helicopter's fuel tank depends on its type. For instance, the AW101 Merlin has underfloor tanks. Some helicopters have multiple tanks, with one feeding the other three via a common fuel gallery.
Helicopter fuel tanks are designed to increase fuel capacity and, in turn, the helicopter's range. The majority of helicopters are designed to carry enough fuel to fly between 1.5 and 3 hours, with a 20-minute reserve. However, a bigger helicopter with a bigger tank will weigh more, requiring more fuel to generate the power to move that weight. Therefore, fuel efficiency is not only affected by the size of the tank but also by the type of engine and fuel. For example, piston-powered helicopters burn fuel at a lower rate than gas turbine-powered helicopters.
The type of fuel used in helicopter tanks also affects fuel efficiency. In North America and Western Europe, piston-powered helicopters fill their tanks with aviation gasoline grade 100LL, which contains three times the amount of tetraethyl lead per liter found in car gasoline. This substance prevents detonations during combustion that may result in piston engine failure. However, it is toxic and must be handled carefully.
To differentiate between fuel types, fuel producers dye the fuel during production. For example, AVGAS 82UL is purple, AVGAS 100 is green, and AVGAS 100LL is blue. This makes it easier to identify whether the correct type of fuel is being used.
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They enable helicopters to fly longer distances without needing to land
The AW101 Merlin helicopter has underfloor fuel tanks, with Tank 4 at the back feeding the other three. In most helicopters, auxiliary fuel tanks are located inside the fuselage, or the main body, of the aircraft. This is because the location helps balance the weight of the aircraft, maximises functionality and minimises the risk of fuel leak incidents.
The fuselage is the optimal location for auxiliary fuel tanks because it helps maintain the balance of the helicopter. Weight distribution is crucial for stability during flight. If the tanks were located in the cockpit, cargo area, or tail section, it could lead to an imbalance that affects the aircraft's performance and safety.
The location of the auxiliary fuel tanks in the fuselage also reduces the risk of fuel leaks in areas that are more sensitive or congested, such as the cockpit or cargo area, enhancing the overall safety of the helicopter. The placement of these tanks in the fuselage also ensures better weight distribution and enhances the safety of the aircraft.
By increasing the fuel capacity of the helicopter, auxiliary fuel tanks enable helicopters to fly longer distances without needing to land. For example, in military helicopters like the CH-47 Chinook, auxiliary fuel tanks are installed in the fuselage to allow for extended missions without compromising stability or safety.
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The AW101 Merlin helicopter has underfloor tanks
The AgustaWestland AW101 is a medium-lift helicopter used by military and civilian operators. Several operators, including the armed forces of Britain, Denmark, and Portugal, use the name Merlin for their AW101 aircraft. The AW101 is one of the most advanced multi-role troop and cargo-carrying helicopters. It can be used for tactical troop transport, utility support, maritime interdiction operations, reconnaissance, anti-surface warfare, and search and rescue (SAR) operations.
The AW101 Merlin helicopter has underfloor fuel tanks. The tanks feed into a manifold that is located just under the cabin floor on the starboard side, forward of the starboard sponson. From the manifold, pipes run up the starboard side of the cabin, then along the transmission deck to each engine and the APU. The fourth tank is located at the back and feeds the other three via a common fuel gallery that runs down the port side of the aircraft. The fourth tank acts as a reservoir to top up the main tanks during flight, and there is capacity for an additional transfer tank to increase the helicopter's range.
The AW101's underfloor fuel tank system is designed to provide fuel to the helicopter's powerful engines. Each engine is fed by a dedicated self-sealing fuel tank using dual booster pumps and a crossfeed system. The fuel supply lines are likely no bigger than 1 inch in diameter. The exact location of the fuel pipes from the underfloor tanks to the engines is not clear from the available sources, but they appear to run up the sides of the aircraft.
The AW101 Merlin helicopter's underfloor fuel tanks and pipe system are an important part of its design, allowing it to carry out its multi-role missions effectively. The helicopter's range can be further extended through in-flight refuelling, and the crew has the option to select the pressure for refuel, defuel, jettison, and buddy-to-buddy refuelling. The AW101 is a highly capable and flexible aircraft, with a maximum range of 927 km and a maximum endurance of four hours and 50 minutes.
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Frequently asked questions
The AW101 Merlin helicopter has underfloor tanks. Tank 4, at the back, feeds the other three.
Auxiliary fuel tanks on helicopters are usually located inside the fuselage, or the main body of the aircraft.
Placing the auxiliary fuel tanks in the fuselage helps maintain the balance of the helicopter, as weight distribution is crucial for stability during flight.
The auxiliary fuel tanks are not located in the cockpit, cargo area, or tail section.
The purpose of auxiliary fuel tanks is to increase the fuel capacity of the helicopter, allowing it to fly longer distances without landing.
