How many engines does an airplane have? Civil aircraft generally have several engines

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Generally, civil aircraft are two engines, and if one is broken, it's over. There are 3 special planes for the chief, and as long as one of them is useful when necessary, it will be safe Fighters are generally one or two, one small civil aircraft, two medium-sized aircraft, four large ones, and even eight B 52, and there is no more because it is a special plane. Of the aircraft with multiple engines, only one can operate normally, although the aircraft cannot climb and accelerate, it can maintain the flight, providing conditions for maintenance and forced landing.

This means that the aircraft also has a set of engines that provide power for the aircraft and the power of the operating system, such as lighting and air conditioning when the aircraft is on the ground: the landing gear of the aircraft, the rudder control base and other hydraulic power. When the main engine is not working, it has to rely on this power system.

Whether this auxiliary engine works or not when the main engine is working is also not a generalization. Whether there are two systems for a small aircraft is not the same, such as ultralight aircraft, there must be only one engine.

It depends on what kind of aircraft. There is one, two, three, four. There are six more.

Boeing 707....747 4 engines 727 3 737...757..767..777..717..787 2 pcs.

Civil aircraft generally have 2-4 engines.

4 rounds: Boeing, Douglas DC-8, Airbus A300, A340, A380, DH106 Comet, VC10, Il-62, Il-86, Il-96. Chinese Y-10.

3 rounds: Boeing 727, Lockheed L-1011 Samsung, Douglas DC-10, HS121 Trident

2 rounds: Boeing, Douglas DC-9, McDonnell Douglas MD-80, MD-90, Airbus A310, A320, A-330, A-350, BAC1-11,

Boeing's are generally under the wings, the propellers are generally on both sides of the wings, and some are in the nose.

Jet fighter engines are generally in the armpits.

In the case of a twin-engine aircraft, two engines work at the same time, and a four-engine aircraft has four engines working at the same time.

It can be roughly divided into two categories, air-breathing engines are referred to as air-breathing engines and rocket jet engines.

Classification details. There are two common classification principles for aircraft engines: whether air participates in the engine operation and the principle that the engine generates propulsion power. According to whether the engine needs air to participate in the work, aircraft engines can be divided into two categories, roughly as follows:

1. The air-sucking engine is referred to as the air-breathing engine, which must suck in air as an oxidizer (accelerant) for fuel, so it cannot work in the space outside the dense atmosphere, and can only be used as the engine of the aircraft. Generally speaking, aero engines refer to this type of engine. For example, according to the different working principles of air-breathing engines, air-breathing engines are divided into piston engines, gas turbine engines, ramjet engines and pulsating jet engines.

2. The rocket jet engine is an engine that does not rely on air to work, and the spacecraft needs to fly outside the atmosphere, so Bida must install this kind of engine. It can also be used as a boost power for aircraft. According to the different energy sources that form jet flow energy, rocket engines are divided into chemical rocket engines, electric rocket engines and nuclear rocket engines.

Number of engines used.

The number of engines on board an aircraft is determined by the weight of the aircraft, the type, the purpose, and the type of engine.

Generally speaking, the first principle to determine the number of engines is weight, light aircraft or ultralight aircraft due to the small take-off weight, more than 1 2 engines, while large aircraft are generally equipped with 2 4 engines, or even more.

In the early days of aviation history, due to the small power of a single piston engine at that time, more than 4 engines were needed to drive a large aircraft (now it seems that it can only be regarded as a medium-sized aircraft), and there were often 6, 8, or even 12 aircraft, so many engines made the structure of the aircraft quite complex, and the failure rate was quite high, so most of these multi-engine aircraft were short-lived.

With the advancement of propulsion technology, the power of modern aviation jet engines is getting higher and higher, the thrust is getting bigger and bigger, and it does not need many units to provide enough power for the aircraft, so the number of aircraft engines in Qizhou has shown a decreasing trend in recent years, and most aircraft are only equipped with 1 2 engines. However, in some special cases, such as some airworthiness regulations that require a passenger aircraft to fly across the ocean must have more than three engines to ensure sufficient endurance during a single engine stop (these regulations have been adjusted accordingly with the advent of the twin-engine Boeing-777 aircraft), so today's long-range transport aircraft use four engines.

As for the combat aircraft, due to the lighter body and the higher requirements for the compactness of the structure of the aircraft, the number of engines is 1 2, 1 for light fighters and 2 for heavy fighters.

Large passenger aircraft can be divided into twin-engine airliners and four-engine airliners according to different models. Take the Boeing 787 as an example, the Boeing 787 is a twin-engine large passenger aircraft, and its variants are typically designed with three tiers of seats that can accommodate 242 to 335 passengers, and are twin-engine wide-body medium- and long-haul passenger aircraft.

The Airbus A380 is a four-engine long-range wide-body civil transport aircraft, and the Airbus A380 is the world's largest wide-body passenger aircraft manufactured by Airbus in Europe. The A380 is available with Rolls-Royce Trent 900 (A380-841-842) and EngineAlliance GP7270 (A380-861) turbofan engines. The GP7270 uses the core of the GE90 and the PW4090 and Rolls-Royce turbofans and low-pressure compressors.