PRANSAC ASSIGNMENT 1
‘Using the B737 as an aircraft type, you are required to research on the inventions and Innovations that have made this particular aircraft impact the development of Commercial airplane.’
The Boeing B737 is a short to medium wide range narrow body twin-engine body jet airliner. Originally designed in 1964, initially had its first maiden voyage in 1967 and joined into professional service in 1968. B. Company
Boeing had been the number one professional plane company. This company controls 60% of a competitive commercial market and its professional aircraft goods and services account for more than 70% of Boeing's income. Boeing's products symbolize a complete family of jetliners in the variety of travellers and freight adjustments and wide ranging abilities. The B737 has developed different series such as B737 Original, B737 Classic, B737 New Generation, and the newest series 737 MAX. The Boeing 737 is the best-selling jetliner in aviation history. A. Idea
In 1958 Boeing had a design research for "A twin engine feeder airliner to complete the family of Boeing passenger jets". In Feb 1965 the first purchase was placed and the project went ahead. The 737 has since become the best-selling professional planes in planes record with more than 5,900 purchases from 225 clients so far. < Chris Brady. 1999.> B. Design
Boeing wanted to design a real short-haul jet to compete with its competitors like the Caravelle, BAC One-Eleven & DC-9. However they are way behind them. The DC-9 was about to fly, the One-Eleven was well into its flight test program and the Caravelle had been in service for 5 years. They had some catching up to do. Designers Joseph Sutter and Jack Steiner began work on the 737 in November 1964. The original 1964 specification was for a capacity of about 60-85 passengers, an economical operating range of between 100 and 1000 miles and to be able to stay equal at a 35% load factor. As a result of final design talks with launch customer Lufthansa the capacity was increased to 100, but the range and load factor figures still remains the same. < Chris Brady. 1999.> Invention/Innovation of the aircraft
A. Placing the Engines
i. Wing Mounted Engines
The wing mounted engines provided the key benefits of decreased interference drag, a better C of G position, less noisy cabin, more useful cabin space at the back, front & aft side doors, easier access to engines for servicing and required less pipework for fuel & bleed. The bodyweight of the engine also provides twisting comfort from the rise of the wings. Apparently this benefit was over-estimated and a set of wings were unsuccessful in static tests at 95% of max load so the side had to be remodelled. ii. Disadvantage
The disadvantage of wing-mounted engines was that the size of the fin had to be increased for engine-out operation over centerline thrust aircraft. Also, due to the reduced ground clearance, the engines had to be almost an essential part of the wing, which in turn using a short chord. The engines extended both forward and aft of the wing to reduce aerodynamic interference and straighter top line of the nacelle formed a streamline flow over the wing to further reduce drag. iii. Advantage
Overall, the wing-mounted layout had a weight saving of 700Kgs over the equivalent “T-tail” design and had performance advantages. iv. Thrust Reversers
Thrust reversers were taken from B727 were found to be inefficient when used by the B737. Therefore B737’s thrust reversers were greatly improved, allowing the aircraft to land on shorter airstrips. B. Type Of engine
The CFM56-3B-1 turbofan engine was chosen to power the aircraft, which yielded significant gains in fuel economy and a reduction in noise, but also posed an engineering challenge given the low ground clearance of the 737 and the larger diameter of the engine...
References: Chris Brady. "History & Development of the Boeing 737." History & Development of the Boeing 737. N.p., Sept. 1999. Web. 27 June 2012. <http://www.b737.org.uk/history.htm>.
"Fly by Wire." Wikipedia. Wikimedia Foundation, 23 June 2012. Web. 28 June 2012. <http://en.wikipedia.org/wiki/Fly_by_wire>.
"Boeing 737 - American Flyers." Boeing 737 - American Flyers. N.p., n.d. Web. 28 June 2012. <https://www.americanflyers.net/airplanes/boeing_737.htm>.
"Boeing 737RE." Wikipedia. Wikimedia Foundation, 27 June 2012. Web. 28 June 2012. <http://en.wikipedia.org/wiki/Boeing_737RE>.
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