Introduction The AC313 aircraft is jointly developed by AVIC Helicopter Research Institute and AVIC Changfei Company. It is my country's first large transport helicopter developed in full compliance with the requirements and procedures stipulated in airworthiness regulations. , is also the only large helicopter developed and produced by my country at present, filling the gap in the production of large civil helicopters in my country. The AC313 is a typical single-rotor helicopter with a tail rotor, a parallel-pilot configuration, equipped with three turboshaft engines, non-retractable landing gear at the front three points, and a maximum take-off weight of 13.8 tons. It is suitable for use in marine climate conditions and other Used in various complex and harsh environments, it can take off and land in general outdoor areas, and perform tasks such as transportation of personnel and materials, search and rescue, and rescue and disaster relief. The aircraft made its first flight on March 18, 2010. Number explanation: AC stands for the abbreviation of AVIC Helicopter Company (Avicopter).
"3" represents the saying of "three things that create all things" in traditional Chinese culture, symbolizing the vigorous development of China's helicopter industry; "1" represents the technical level of the helicopter; "3" represents the vortex installed on the helicopter. Number of shaft engines. [Edit this paragraph] Technical performance AC313 has an optimized aerodynamic shape of the airframe, advanced rotor blade airfoil and configuration, high rotor hovering efficiency, and strong tail rotor resistance to crosswinds. It has broken through the bottleneck technology that limits the flight performance of my country's large transport helicopters. It has plateau flight capabilities and can better meet the stringent requirements for helicopter flight performance in complex areas such as mountainous areas.
After the aircraft completed its test flight, its overall performance has reached the world's advanced technology level. It adopts advanced turboshaft engines, transmission systems with high power transmission capabilities, spherical flexible composite rotor systems and integrated avionics systems to improve maintenance and comfort, and comprehensively upgrade the structure, system safety and other technologies. This is a medium-to-large civil aircraft independently developed by our country. Looking at its overall performance, it can rank among the world's advanced helicopters.
Engine research and development is one of the core technologies in helicopter development. my country has made a breakthrough in the development of key models of helicopter turboshaft engines. The first fully indirect-heated medium-pressure combustor performance tester developed by the Aviation Industry Research Institute has realized the transformation of the heating method from direct heating to indirect heating. Its variable frequency power supply The oil system and afterburning heating device were patented respectively. At present, the turboshaft engines assembled in our country's helicopters are basically imported or imitated. The successful development of this tester provides a basis for the research on the combustion chamber of my country's first key model turboshaft engine that is completely independently developed and has completely independent intellectual property rights. A solid experimental research platform. AC313 cockpit
The rotor system uses advanced composite material blades and titanium alloy spherical flexible main propeller hub. The body is a metal composite material structure. The composite material area accounts for 50% of the entire aircraft. The avionics system adopts international The popular 429 data bus realizes digital comprehensive display control.
The overall performance reaches the international third-generation helicopter level. The key technologies for breakthroughs include: the transmission system meets the 30-minute "dry running" safety requirements; the fuel system and airframe structure meet the anti-crash and lightning strike safety requirements; the driver and passenger seats pass the anti-crash dynamic safety test; the airframe structure The control system and rotor system meet bird strike safety requirements; airborne equipment meets lightning strike and high-intensity radiation field protection design requirements; the cockpit layout meets crew emergency evacuation safety requirements; the rotor and composite material structure meet fatigue assessment requirements based on damage tolerance; The mechanical system meets the design requirements for high-energy rotor rupture protection.
The AC313 helicopter is marked by a composite spherical flexible rotor system, full-authority digital electronic adjustment and control of the engine, a large-area composite structure, an integrated avionics system, digital design and manufacturing, and the latest airworthiness safety standards. , realizing the leap in the overall technical level of my country's large transport helicopters from the second generation to the third generation. Due to its focus on detailed design of use and maintenance, life reliability design and support design, AC313 has made great progress in terms of economical use throughout its life cycle compared with previous models.
AC313 has seven main features:
——High safety. Equipped with three engines, it can continue flying if one engine fails, and can land at a nearby location if two engines fail, greatly improving the survival probability of those on board.
——Good three-proof performance. Designed in strict accordance with anti-salt spray, anti-humidity and anti-mold standards, it is suitable for use in marine climate conditions and other harsh environments.
——Large space. The cabin has an effective volume of 23.5 cubic meters and a height of 1.83 meters. Ordinary Chinese people can walk upright in it. Equipped with comfortable aviation seats and interiors, it can be converted into a VIP business jet as needed.
——Strong carrying capacity. When used for cargo transportation, it can carry up to 4 tons of cargo in the cabin or lift 5 tons externally. When used for personnel transportation, it can carry up to 27 passengers, or transport 15 stretchers and a medical staff chair and workbench. A manual or electric winch can be optionally installed in the cabin, and a tie-down device is left on the floor to facilitate loading, unloading and securing cargo.
——Long voyage. The aircraft has a maximum range of 900 kilometers with a full fuel tank. When carrying three transition fuel tanks, the transition range can be increased to more than 1,400 kilometers.
——Excellent maneuverability. The control system is ingeniously designed, with collective pitch and vertical and horizontal control linkage, and is supplemented by a four-axis autopilot. The operating load is small and the flight quality is good.
——Wide range of application. It can be used normally in the temperature range of -40℃ ~ 50℃, the maximum flight altitude can reach 6,000 meters, and it can take off and land at airports with an altitude of 4,500 meters.
It is worth noting that the "13-ton class" of the AC313 cannot be directly compared with the "20-ton class" of the Mi-26. The "13-ton class" of the AC313 refers to the total take-off weight, while the "20-ton class" of the Mi-26 refers to the load capacity. The total take-off weight of the Mi-26 is "55 tons". (Transfer)