The 747 is a four-engined jet aircraft, initially powered by Pratt & Whitney JT9D turbofan engines, then General Electric CF6 and Rolls-Royce RB211 engines for the original variants. With a ten-abreast economy seating, it typically accommodates 366 passengers in three travel classes .

波音747，又稱為「珍寶客機/巨無霸客機」（Jumbo Jet） [6][7]，是全世界首款生产出的 廣體 民航飛機，由 美國 波音民用飞机集团 製造。 波音747雛型的大小是1960年代被廣泛使用的 波音707 的兩倍 [8]。 由1970年投入服務至2007年 空客 A380 起役爲止，波音747一直保持全世界載客量最高飛機的纪录長達37年。 波音747是一款半雙層四引擎飛機，可用于載客、載貨、軍事或其它用途，例如作為美國總統 指揮專機 和 空軍司令部。 747上層甲板的設計令它的貨機型號能夠在機 …

The Pratt & Whitney JT9D high-bypass turbofan engine was developed for the Boeing 747. The JT9D program was launched in September 1965 and the first engine was tested in December 1966. It received its FAA certification in May 1969 and entered service in …

The 747-8 incorporates breakthrough technology—the GEnx engine, a wing design with better performance, and lighter alloys and composites—that substantially reduces fuel consumption. The 747-8 has better fuel economy than any large airplane in service today.

2019年4月19日 · While the science behind the high bypass ratio engine in a 747 plane may seem complicated, the results are striking. It's capable of delivering over 70% more...

11 小时之前 · The jet was the first Boeing 747-400 produced and served as a prototype. ... Pratt & Whitney then used the aircraft as a test bed for its PW4000 series engines, which would power all of Delta's ...

In summary, the Boeing 747 is a wide-body airliner, powered by four turbofan engines, with a fuselage constructed of aluminum and composite materials, wings swept back to provide lift during flight, and landing gear to support the aircraft during ground operations.

Boeing used a new method of spotting potential hazards known as "fault tree analysis," where engineers could easily see the impact of a failure of one part or system on other parts. The 747 became the first airplane to use this accurate method of forecasting possible trouble.

The Boeing 747-400 is a four-engined long-range widebody airliner with a capacity of maximum 660 passengers in a partial double deck configuration produced by the American manufacturer Boeing Commercial Airplanes. The 747-400 was also produced as a cargo freighter.

New engines offered on the 747-400 included the Pratt & Whitney PW4056, the General Electric CF6-80C2B1F, and the Rolls-Royce RB211-524G/H. [12] The engines offered lower fuel consumption and greater thrust, along with a full-authority digital engine control ( FADEC ) which adjusted engine performance for improved efficiency compared with the ...