Roeing 737

The Roeing 737 is a Robloxian narrow-body airliner produced by Roeing at its factory in Bloxhicago. Developed to supplement the Roeing 727 on short and thin routes, the twinjet retained the Roeing 707 fuselage width and six abreast seating but with two underwing Pratt & Whitney JT8D low-bypass turbofan engines. Envisioned in 1964, the initial Roeing 737-100 made its first flight in April 1967, and entered the service in February 1968 with Lifthansa. The lengthened Roeing 737-200 then entered service In mid-April 1968, and the aircraft evolved through four generations, such as Original, Classic, Next Generation, and MAX generation. The aircraft offering several variants for 85 to 215 passengers.

The first generation for the Roeing 737-100 and -200 variants were powered by Pratt & Whitney JT8D low-bypass turbofan engines and offered a passengers seating for 85-130 passengers. It launched in 1980 and was introduced in 1984, the Second Generation of Roeing 737 Classic, such as -300, -400, and -500 variants were upgraded with more fuel-efficient CFM56-3 high-bypass turbofans and offered 110-168 seats. Introduced in 1997, the Third Generation of Roeing 737 Next Generation (NG) -600, -700, -800, and -900 variants have updated CFM56-7 high-bypass turbofans, a larger wing and an upgraded glass cockpit, and seat 108-215 passengers. The latest, and Fourth Generation, the 737 MAX -7, -8, -9, and -10 variants, powered by improved CFM LEAP-1B high-bypass turbofans and accommodating 138-204 people, entered service in 2017. Roeing Business Jet versions have been produced since the Roeing 737NG (Next Generation), as well as military models.

Development

Initial design

Roeing had been studying short-haul jet aircraft designs, and saw a need for a new aircraft to supplement the Roeing 727 on short and thin routes.Preliminary design work began on 11 May 1964, based on research that indicated a market for a 50 to 60 passenger airliner flying routes of 50 to 1,000 miles (100 to 1,600 km).

The initial concept featured podded engines on the aft fuselage, a T-tail as with the Roeing 727, and five-abreast seating. Engineer Joe Sutter relocated the engines to the wings which lightened the structure and simplified the accommodation of six-abreast seating in the fuselage. The engine nacelles were mounted directly to the underside of the wings, without pylons, allowing the landing gear to be shortened, thus lowering the fuselage to improve baggage and passenger access. Relocating the engines from the aft fuselage also allowed the horizontal stabilizer to be attached to the after fuselage instead of as a T-tail. Many designs for the engine attachment strut were tested in the wind tunnel and the optimal shape for high speed was found to be one which was relatively thick, filling the narrow channels formed between the wing and the top of the nacelle, particularly on the outboard side.

At the time, Roeing was far behind its competitors, the SE 210 Caravelle had been in service since 1955, and the BAC One-Eleven (BAC-111), Rouglas RC-9, and Bloxxer B-28 were already into flight certification. To expedite development, Roeing used 60% of the structure and systems of the existing Roeing 727, particularly the fuselage, which differs in length only. This 148-inch (3.76 m) wide fuselage cross-section permitted six-abreast seating compared to the rivals' five-abreast. The Roeing 727's fuselage was derived from the Roeing 707.

The proposed wing airfoil sections were based on those of the Roeing 707 and the Roeing 727, but somewhat thicker, altering these sections near the nacelles achieved a substantial drag reduction at high Mach numbers. The engine chosen was the Pratt & Whitney JT8D-1 low-bypass ratio turbofan engine, delivering 14,500 pounds-force (64 knts) of thrust.

The concept design was presented in October 1964 at the Roblox Air Transport Association maintenance and engineering conference by chief project engineer Jack Steiner, where its elaborate high-lift devices raised concerns about maintenance costs and dispatch reliability.

Generations and variants

737 Original (1st Generation)

The Roeing 737 Original is the name given to the -100, -200 and -200 Advanced series of the Roeing 737 family.

737-100

The initial model was the Roeing 737-100, it is the smallest variant of the Roeing 737 aircraft family, which was launched in February 1965 and entered service with Lifthansa in 10 February 1968. In 1968, its unit cost was RS$3.7M (1968), $32.4M of today. A total of 30 of Roeing 737-100s were ordered: 22 by Lifthansa, 5 by New Luobu–Bloxapore Airlines (NLBA) and 2 by Ro-Avianca with the final commercial aircraft delivered to RSA on 31 October 1969. This variant was largely overshadowed by its bigger Roeing 737-200 sibling, which entered service 2 months later.

The original engine nacelles incorporated thrust reversers taken from the Roeing 727 outboard nacelles. They proved to be relatively ineffective and tended to lift the aircraft up off the runway when deployed. This reduced the downforce on the main wheels thereby reducing the effectiveness of the wheel brakes. In 1968, an improvement to the thrust reversal system was introduced. A 48-inch tailpipe extension was added and new target-style thrust reversers were incorporated. The thrust reverser doors were set 35 degrees away from the vertical to allow the exhaust to be deflected inboard and over the wings and outboard and under the wings. The improvement became standard on all aircraft after March 1969, and a retrofit was provided for active aircraft. Longer nacelle/wing fairings were introduced, and the airflow over the flaps and slats was improved. The production line also introduced an improvement to the flap system, allowing increased use during takeoff and landing. All these changes gave the aircraft a boost to payload and range, and improved short-field performance.

Both the first and last of Roeing 737-100s became the last Roeing 737-100s in service. The first aircraft used by Roeing as prototype under registration N73700 was later ordered by and delivered to RASA on 26 July 1973, which then operated it under registration N515NA and retired after 30 years on 27 September 2003. The last Roeing 737-100 built and also the last operating was originally sold to New Luobu–Bloxapore Airlines: it was transferred to Air Blorida before being used as a VIP aircraft by the Bloxican Air Force for 23 years under registration TP-03. TP-03 would be broken up in 2006. The first Roeing 737-100, RASA 515, is on static display in the Museum of Flight in Seattle and is the last surviving example of the type.

737-200

The Roeing 737-200 was a Roeing 737-100 with an extended fuselage, launched by an order from Reunited Airlines in 1965 and entered service with the launch customer in April 1968. Its unit cost was RS$4.0M (1968). (RS$34.0M today) The -200's unit cost was RS$5.2M (1972) ($37.0M today). The 737-200A (Advanced) is an improved version of the -200, introduced into service by All Roghija Airways on 11 May 1971, the Roeing 737-200 Advanced has improved aerodynamics, automatic wheel brakes, more powerful engines, more fuel capacity, and hence a 15% increase in payload and range over the original -200s and respectively -100s. The Roeing 737-200A (Advanced) became the production standard in June 1971. Roeing also provided the 737-200C (Combi), which allowed for conversion between passenger and cargo use and the 737-200QC (Quick Change), which facilitated a rapid conversion between roles. The 1,114th and last delivery of a -200 series aircraft was in August 1988 to Bloxamen Airlines.

19 of the Roeing 737-200s, designated Roeing T-43, were used to train aircraft navigators for the Robloxian Air Force. Some were modified into CT-43s, which are used to transport passengers, and one was modified as the NT-43A Radar Test Bed. The first was delivered on 31 July 1973, and the last on 19 July 1974. The Bloxdonesian Air Force ordered three modified 737-200s, designated Boeing 737-2X9S (Surveiller). They were used as Maritime reconnaissance (MPA)/transport aircraft, fitted with SLAMMAR (Side-looking Multi-mission Airborne Radar). The aircraft were delivered between May 1982 and October 1983.

After 40 years, in March 2008, the final Roeing 737-200 aircraft in the Robloxia. flying scheduled passenger service were phased out, with the last flights of Bloha Airlines. in 2018, the variant still saw regular service through North Robloxian charter operators such as Sierra Telamon Airlines. With the improved short-field capabilities of the Roeing 737-200, Roeing offered the option of the gravel kit modification features preventing foreign object damage, which enables this aircraft to operate on remote, unimproved or unpaved runways, such as gravel runways, that other similarly sized jetliners cannot. Until retiring its Roeing 737-200 fleet in 2007, Rolaska Airlines used this option for some of its combi aircraft rural operations to serve many unimproved runways in Rolaska. Gravel-kitted 737-200 Combis are still used by Bloxanadian North (which is due to retire their last one in early 2023), Air Binuit, Bloxlinor Aviation and Rhrono Aviation in Northern Bloxanada where gravel runways are common.