British Aerospace 146. The British Aerospace 146 (also BAe 146) is a short-haul and regional airliner that was manufactured in the United Kingdom by British Aerospace, later part of BAE Systems. Production ran from 1983 until 2001. Avro International Aerospace manufactured an improved version known as the Avro RJ. Production for the Avro RJ version began in 1992. Later on, a further-improved version with new engines, the Avro RJX, was announced in 1997, but only two prototypes and one production aircraft were built before production ceased in 2001. With 387 aircraft produced, the Avro RJ/BAe 146 is the most successful British civil jet airliner program.

The BAe 146/Avro RJ is a high-wing cantilever monoplane with a T-tail. It has four geared turbofan engines mounted on pylons underneath the wings, and has a retractable tricycle landing gear. The aircraft operates very quietly, and as such has been marketed under the name Whisperjet. It sees wide usage at small, city-based airports such as London City Airport. In its primary role, it serves as a regional jet, short-haul airliner, or regional airliner, while examples of the type are also in use as private jets.

The BAe 146 was produced in -100, -200 and -300 models. The equivalent Avro RJ versions are designated RJ70, RJ85, and RJ100. The freight-carrying version carries the designation "QT" (Quiet Trader), and a convertible passenger-or-freight model is designated as "QC" (Quick Change). A "gravel kit" can be fitted to aircraft to enable operations from rough, unprepared airstrips.

Development

Origins

In August 1973, Hawker Siddeley launched a new 70-seat regional airliner project, the HS.146, to fill the gap between turboprop-powered airliners such as the Hawker Siddeley HS.748 and the Fokker F27 Friendship and small jet airliners such as the BAC One-Eleven and Boeing 737. The concept of a feeder jet had, however, been "one of the many speculative ideas on the drawing boards of British aircraft manufacturers" as far back as 1958.

The chosen configuration had a high wing and a T-tail to give good short-field performance, while the aircraft was to be powered by four 6,500 lbf thrust Avco Lycoming ALF 502H turbofan engines. There were several reasons why a twin engine configuration was not chosen, this being a controversial decision for a relatively small aircraft and dictated by the choice of engine which, despite its "rugged, quiet and fuel efficient" characteristics, needed to be deployed in a four-engine configuration to provide the power and range required by the concept. Such a configuration was considered by British Aerospace to be advantageous in the event of a single engine failure, offering "exceptional three-engine performance" that would appeal to operators in mountainous environments and from "high, hot or poor grade airfields".

The programme was initially launched with backing from the UK government, which agreed to contribute 50% of the development costs in return for a share of the revenues from each aircraft sold. In October 1974, all work on the project was halted as a result of the world economic downturn resulting from the 1973 oil crisis.

Low-key development proceeded, however, and in 1978, British Aerospace, Hawker Siddeley's corporate successor, relaunched the project. British Aerospace marketed the aircraft as a quiet, low-consumption, turbofan aircraft, which would be effective at replacing the previous generation of turboprop-powered feeder aircraft. The first order for the BAe 146 was placed by Líneas Aéreas Privadas Argentinas in June 1981. Prior to the first flight, British Aerospace had forecast that the smaller  would significantly outsell the 146-200 variant; however, airlines showed a higher level of interest in the larger 146-200.

By 1981, a large assembly line had been completed at British Aerospace's Hatfield site, and the first completed aircraft flew that year, quickly followed by two more prototypes. By then, the unit cost of the 146-200 was £11 million, and the program cost was £350 million. Initial flight results showed better-than-predicted takeoff and climb performance. In 1982, British Aerospace stated that the sale of a total 250 aircraft was necessary for the venture to break even. The BAe 146 received its Certificate of Airworthiness on 8 February 1983. Upon its launch into service, it was hailed as being "the world's quietest jetliner".

Production

Early production aircraft were built at Hatfield, which had originally been a de Havilland factory. The Avro RJ family of aircraft was assembled at the Avro International (BAE Systems Regional Aircraft Centre) at Woodford Aerodrome in Greater Manchester, England. Production of various sections of the aircraft was carried out at different BAE plants: the rear fuselage section was manufactured at the former Avro site at Chadderton, Greater Manchester; the centre fuselage section was manufactured at Filton; the vertical stabilizer came from Brough; the engine pylons were made at Prestwick; and the nose section was manufactured at Hatfield, where the assembly line for the early aircraft was located. Some manufacturing was subcontracted outside the UK; the wings were made by Textron in the United States and the tailplane and control surfaces were made by Saab-Scania in Sweden.

Due to the sales performance of the BAe 146, British Aerospace announced a development project in early 1991 to produce a new variant of the type, powered by two turbofan engines instead of four, that was offered to airlines as a regional jet aircraft. Dubbed the new regional aircraft (NRA), other proposed alterations from the BAe 146 included the adoption of a new enlarged wing and a lengthened fuselage.

In 1993, the upgraded Avro RJ series superseded the BAe 146. Changes included the replacement of the original Lycoming ALF 502 turbofan engines by higher-thrust LF 507 turbofan engines, which were housed in redesigned nacelles. The Avro RJ series also featured a modernised cockpit with EFIS replacing the analogue ADI, HSI, and engine instrumentation. An arrangement between British Aerospace and Khazanah Nasional would have opened an Avro RJ production line in Malaysia, but this deal collapsed in 1997.

In 2000, British Aerospace announced that it was to replace the Avro RJ series with a further-improved Avro RJX series, however on 27 November 2001 BAE announced the cancellation of the RJX programme as part of the closure of its regional aircraft business. BAE also announced 1,669 job losses and a £400m charge as part of the decision. The Financial Times stated that BAE had "draw[n] a line under a business that once threatened to destroy the whole group. In 1992, the regional aircraft operation blew a hole in the then British Aerospace's balance sheet, forcing it to take a £1bn write-off."

Production of the Avro RJ ended with the final four aircraft being delivered in late 2003; a total of 173 Avro RJ aircraft were delivered between 1993 and 2003.

Design

Overview

British Aerospace promoted the BAe 146 to airlines as a "feederliner" and short-haul regional airliner. The airframe of the aircraft and many other key areas were designed to be as simple as possible. The engines lack thrust reversers due to their perceived reduced effectiveness in anticipated conditions. Instead, the BAe 146 features a large airbrake with two petals below the tail rudder at the rear of the fuselage, which has the advantage of being usable during flight and allowing for steep descent rates if required. In addition, the aircraft has full-width wing spoilers, which are deployed immediately on landing.

The aircraft proved to be useful on "high-density" regional and short-haul routes. In economy class, the BAe 146 can either be configured in a standard five-abreast layout or a high-density six-abreast layout, making it one of few regional jets that can use a six-abreast layout in economy class. Reportedly, the aircraft is profitable on most routes with only marginally more than half the seats occupied.

The BAe 146 is also known for its relatively quiet operation, a positive feature that appealed to those operators that wanted to provide services to noise-sensitive airports within cities. The aircraft is one of only a few types that can be used on flights to London City Airport, which has a steep approach and short runway; for several years, the BAe 146 was the only conventional jet aircraft capable of flying from London City Airport.

Features

According to the BAe 146's chief designer, Bob Grigg, making the aircraft as easy to maintain as possible and keeping operators' running costs as low as possible were considered high priorities from the start of the design process. Grigg highlighted factors such as design simplicity, using off-the-shelf components where possible, and the internal use of firm cost targets and continuous monitoring. British Aerospace also adopted a system of cost guarantees between component suppliers and the operators of the BAe 146 to enforce stringent requirements.

Drawing on experience from the Hawker Siddeley Trident and the Airbus A300, both the fuselage and wing were carefully designed for a reduced part-count and complexity. A high-mounted wing was adopted with an uninterrupted top surface; the BAe 146's wing did not make use of leading-edge extensions, which also enabled a simplified fixed tailplane. The undercarriage of the aircraft is toughened to resist damage and stability is maximised by the placement of landing gear, of particular value when operating from rough airstrips.

The engines are not fitted with thrust reversers, instead the aircraft has a clamshell air brake in the tail and full width spoilers on the wings.

The BAe 146 was the second aircraft, after the Concorde, to use carbon brakes. The aircraft features a low amount of composite material, used in parts of the secondary structure only. Initial production aircraft featured a conventional cockpit and manual flight controls. At launch, the onboard auxiliary power unit consumed only half the fuel and weighed only a third as much as other contemporary models.

The aircraft can be fitted with auxiliary fuel tanks to extend its range. So-called "pannier tanks" fit in the inner wing either side of the fuselage, while more tankage can be fitted in the under-floor baggage compartment, fore and aft of the undercarriage bay.

Engines

The BAe 146 is a quadjet powered by four Avco Lycoming ALF 502 turbofan engines, which are fixed on pylons underneath the aircraft's high wing. The ALF 502 was derived from the Lycoming T55 turboshaft powerplant that powers the Chinook heavy-transport helicopter. Notably, the BAe 146 has a very low level of operational noise, much lower than most competing aircraft. This was achieved largely through the use of the geared turbofan ALF 502; the gearbox allows the fan blade tip speed to stay below the speed of sound, dramatically reducing the aircraft's noise. Additionally, other sound-deadening measures include a high bypass ratio compared to contemporary aircraft and additional sound-damping layers built into the engine.

Early on, the decision to adopt four engines for a feeder airliner rather than two was viewed as atypical by some commentators. Advantages of adopting the four-engine configuration include greater redundancy and superior takeoff performance from short runways, as well as in hot and high conditions. Electrical power is primarily provided by generators located on each of the outboard engines. For ease of maintenance and reduced operator costs, the ALF 502 is of a modular design and makes minimum use of specialist tooling.

The ALF 502 has experienced multiple issues. Its internal electronics could overheat, triggering an automatic shutdown of an engine with no option for inflight restart, and certain rare atmospheric conditions could cause a loss of engine thrust due to internal icing. Additionally, the BAe 146 experienced some issues with its bleed air and cabin pressurization systems, leading to a number of fume events where irritant fumes were introduced into the cabin by the pressurizing system.

Operational history

In May 1983, British airline Dan-Air became the first carrier to launch services using British Aerospace's new 146; the first revenue-earning service was flown between London Gatwick Airport and Bern Airport. On 1 July 1984, the first of 20 BAe 146s ordered by Pacific Southwest Airlines was officially delivered. Air Wisconsin was another major US operator of the 146, replacing their fleet of turboprop Fokker F27 Friendships with the type. In 1985, Aspen Airways inaugurated the first scheduled jet service into Aspen, Colorado, in the Rocky Mountains of the western U.S. with a BAe  operating from an airfield with an elevation of 7,820 feet.  The BAe 146 was announced in January 1987 to have been selected to launch the first jet services from London City Airport; it was chosen due to its unmatched flying characteristics and ability to operate from so-called STOLports.

The 146 was introduced into Royal Air Force service in 1986 until 2022 as a VIP transport and was operated by 32 (The Royal) Squadron. According to Flight International, at least 25 executive aircraft have been produced for various customers; many of these had undergone conversions following airline operations.

From the late 1980s until the early 2000s, the 146 was widely used for passenger services in Australia, where the type was suited to long-distance, low-volume routes; 18 were in service with Ansett Australia in 1999. The BAe 146 was also operated by East-West, taking delivery of eight from 1990, until the company was absorbed into Ansett. National Jet Systems began operations under the Airlink brand on behalf of Australian Airlines (and later Qantas) in 1990, with Airlink's successor QantasLink continuing to use the type until 2005. In 2005, National Jet Systems transferred operations of the BAe 146 and Avro RJ fleet to its subsidiary National Jet Express, which continued to operate 15 aircraft of the type in varying specification for scheduled charter operations, and whose fleet included the second production airframe, a -100 model converted to QT specification, which first flew in January 1982 as part of the testing and certification program. National Jet Express ceased BAe 146 and Avro RJ passenger operations in June 2022 after 32 years and having operated 33 different aircraft of the type.

The initial customer for the BAe RJ85 series was Crossair, which took delivery of its first aircraft on 23 April 1993.

Several major cargo operators have operated the type. As of 2012, the BAe 146 QT was the most numerous aircraft in TNT Airways's air freighter fleet. In 2012, the Royal Air Force (RAF) announced it would acquire the BAe 146M as an interim transport aircraft between the retirement of the Lockheed C-130 Hercules and the introduction of the larger Airbus A400M Atlas, to supplement its air transport activities in Afghanistan. In 2013, the RAF acquired two converted BAe146-200s, designated BAe146C Mk3, capable of carrying 10.6 tons of load, and fitted with a large 3.33- × 1.93-m side door. The RAF also operates the BAe146 CC Mk2 in No. 32 Squadron RAF.

At present, Pionair Australia, operates a mix of -200 and -300 BAe-146 aircraft, in both freight and passenger variants, on scheduled freight charters, ad-hoc passenger charter, and pre booked air tours around Australia, New Zealand, and the South Pacific. National Jet Express also continues to operate a fleet of BAe 146-300QT freighters on behalf of Qantas Freight, providing overnight services to and from curfew-restricted Sydney Airport under a type-specific exemption.

On 3 May 2017, an Airlink Avro RJ85 made the first commercial airline flight in history to Saint Helena in the South Atlantic Ocean, a charter flight from Cape Town, South Africa, via Moçâmedes, Angola, to Saint Helena Airport to pick up passengers stranded when the island's only link with the outside world, the British Royal Mail Ship RMS St Helena, suffered propeller damage. The flight returned to Cape Town the same day with a stop at Windhoek, Namibia. It was the only commercial flight ever made to Saint Helena until Airlink began the first scheduled commercial airline service in the island's history in October 2017.

Variants

BAe  / Avro RJ70

The first flight of the -100 occurred on 3 September 1981, with deliveries commencing in 1983. The launch customer in March 1983 was Dan-Air. From 1986, The Queen's Flight of the RAF acquired a total of three s, designated BAe 146 CC2. These aircraft were fitted with a luxurious bespoke interior and operated in a VIP configuration with a capacity of 19 passengers and six crew.  The BAe 146-100QC (Quick Change) is the convertible passenger/freight version and the BAe 146-100QT (Quiet Trader) is the freighter version.

The -100 was the last of the 146 series designs to be developed into the Avro RJ standard with first deliveries of the Avro RJ70 in late 1993. The RJ70 differed from the  in having LF 507 engines with FADEC and digital avionics.  The RJ70 seats 70 passengers five abreast, 82 six abreast or 94 in high-density configuration.

BAe 146-200 / Avro RJ85

The 146-200 features a 2.41-m (7 ft 11 in) fuselage extension and reduced cost per seat mile. The -200 first flew in August 1982 and entered service six months later.  The BAe 146-200QC (Quick Change) is the convertible passenger/freight version and the BAe 146-200QT (Quiet Trader) is the freighter version. Two BAe 146-200QC aircraft, designated BAe 146 C3, were converted for the RAF, with infrared countermeasures systems and flare dispensers, for use in Afghanistan.

The Avro RJ85, the first RJ development of the BAe 146 family, features an improved cabin and the more efficient LF 507 engines. Deliveries of the RJ85 began in April 1993. It seats up to 112 passengers.

BAe 146-300 / Avro RJ100

British Aerospace announced its initial proposals for the -300 at the 1984 Farnborough Air Show. The aircraft's fuselage was to be stretched by  compared with the -200, allowing 122 passengers to be carried at 32-inch seat pitch and 134 at 29-inch seat pitch. More powerful () ALF 502R-7 engines would be used, and winglets were to be fitted to the aircraft's wingtips. However, due to airlines favouring a lower initial price rather than minimising seat-mile costs, the definitive 146-300 emerged as a less extreme development. Ultimately, the fuselage was stretched by , giving a capacity of 100 passengers seated five-abreast at a 31-inch seat pitch, without winglets or the proposed ALF 502R-7. Deliveries began in December 1988. A modified BAe 146-301 is used as the UK's Facility for Airborne Atmospheric Measurements. The BAe 146-300QC (Quick Change) is the convertible passenger/freight version and the BAe 146-300QT (Quiet Trader) is the freighter version.

The Avro RJ version of the 146-300, the second such development of the 146 product line, became the Avro RJ100. It shared the fuselage of the 146 version, but with interior, engine, and avionics improvements. The most common configuration in the RJ100 seats 100 passengers.  An RJ115 variant, the same physical size, but with an increased MTOW and different emergency exits, was marketed, but never entered production; it seated 116 as standard or up to a maximum of 128 in a high-density layout.

BAe 146STA

Throughout the production life of the BAe 146, British Aerospace proposed a number of specialised military versions, including side- and rear-loading transports, an airborne tanker version, and a carrier onboard delivery version. Out of these proposals came the BAe 146STA (Sideloading Tactical Airlifter), based on the BAe 146QT cargo aircraft and sharing its cargo door on the left side of the rear fuselage. This military-transport version has a refuelling probe protruding from the nose; a demonstrator, fitted with a dummy refuelling probe and an air-openable paratroop door, was displayed at the 1989 Paris Air Show and carried out extensive demonstration tours, but no orders resulted.

BAe 146M
BAE Systems announced the BAe 146M programme in 2009, designed to provide ex-civilian BAe 146-200 and -300 aircraft to military operators, available either in passenger or freighter configurations. Upgrades and alterations made to the type include new glass cockpit avionics, additional fuel tanks, increased steep approach, and unpaved runway operation capabilities, and being outfitted with defensive aids; however, a rear cargo door was not introduced. BAE has stated that the 146M is suitable for performing airlift, medical evacuation, para-drop, surveillance, and inflight refueling operations.

Avro RJX series
The RJX-70, RJX-85, and RJX-100 variants represented advanced versions of the Avro RJ Series. The RJX series used Honeywell AS977 turbofans for greater efficiency (15% less fuel burn, 17% increased range), quieter performance, and 20% lower maintenance costs. Bhutan carrier Drukair ordered two RJX-85s, while British European placed firm orders for 12 RJX-100s and eight options. However, BAE Systems terminated the project in November 2001, having completed and flown only three aircraft—a prototype each of the RJX-85 and RJX-100, and a production RJX-100 for British European. BAE reached an agreement with Druk Air and British European in early 2002 in which the airlines agreed not to enforce their firm orders for the RJX. BAE explored the possibility of manufacturing 14 "hybrid" aircraft, but British European at least was unwilling to accept the risk of operating a unique type.

Firefighting air tanker conversions

Firefighting air tanker versions of both the BAe 146 and the Avro RJ85 have been manufactured by the conversion of aircraft previously operated by airlines in scheduled passenger service. Several organizations carry out such conversions, including U.S.-based Minden Air Corporation, Neptune Aviation Services, and Aero-Flite, a U.S. subsidiary of Canadian-based Conair Group. In January 2012, Conair Group announced its arrangements to market and promote the Avro RJ85 as a major air tanker platform. In October 2012, Air Spray Aviation of Alberta, Canada, purchased its first BAe 146 for conversion into an air tanker. Air Spray purchased a second airframe for conversion in October 2013.

According to the 3 April 2017, edition of SpeedNews-The Windshield, an on-line aviation publication, 14 BAE Systems-built BAe 146-200 and Avro RJ85 jets are in service in North America as aerial firefighting air tankers, with Conair flying seven Avro RJ85 aircraft and Neptune Aviation operating seven BAe 146-200 aircraft. The article also states that Conair is converting an eighth Avro RJ85 for use as an air tanker, while Neptune is converting two more BAe 146-200s for aerial firefighting use.  In addition, Air Spray is mentioned in this article as having acquired five BAe 146-200s for conversion to air tankers.

Airbus E-Fan X

The Airbus/Rolls-Royce/Siemens E-Fan X was a hybrid electric aircraft demonstrator being developed by a partnership of Airbus, Rolls-Royce plc and Siemens.

Announced on 28 November 2017, it followed previous electric flight demonstrators towards sustainable transport for the European Commission's Flightpath 2050 Vision.

An Avro RJ100 flying testbed would have one of its four Honeywell LF507 turbofans replaced by a Rolls-Royce  electric motor, adapted by Rolls-Royce and powered by its AE2100 turboshaft, controlled and integrated by Airbus with a  battery.
Airbus and Rolls-Royce abandoned the E-Fan X programme several months before the planned first flight as the commercial aircraft industry changed its priorities during the COVID-19 pandemic.

Operators

In July 2020, 54 aircraft were in airline service, 27 BAe 146s and 27 Avro RJs, with additional 17 BAe 146s and 47 Avro RJs in storage

Accidents and incidents

The BAe-146/Avro RJ has been involved in 14 hull-loss accidents with a total of 294 fatalities and one criminal occurrence with 43 fatalities.

Accidents with fatalities

 On 7 December 1987, Pacific Southwest Airlines Flight 1771, a BAe 146-200A registration N350PS, crashed after a recently-terminated, disgruntled USAir employee with a .44 Magnum revolver killed the flight crew and his former boss. He then pushed the aircraft into a steep nosedive, causing the aircraft to pick up speed to , the flight going supersonic just before impact. The aircraft crashed into a hillside near Cayucos, California, United States, killing all 43 passengers and crew. At the time, airline employees were allowed to bypass security checkpoints.

 On 20 February 1991, LAN Chile Flight 1069 (registration CC-CET), a BAe 146-200A, overran Runway 8 while landing at Puerto Williams Airport, Chile, killing 20 of the 73 people on board.

 On 23 July 1993, China Northwest Flight 2119, a BAe 146-300 (registration B-2716), crashed while departing Yinchuan Airport, China, killing 55 of the 113 passengers and crew.

 On 25 September 1998, PauknAir Flight 4101, a BAe  (registration EC-GEO), crashed on approach to Runway 15 at Melilla Airport, Spain, killing all 38 passengers and crew.

 On 24 November 2001, Crossair Flight 3597, operated by Avro RJ-100 registration HB-IXM, crashed while on a VOR/DME approach to Runway 28 at Zürich-Kloten Airport, Switzerland, killing 24 of the 33 passengers and crew.

 On 8 January 2003, Turkish Airlines Flight 634, an Avro RJ-100 (registration TC-THG) crashed while on a VOR/DME approach to Runway 34 at Diyarbakır Airport, Turkey; 75 of the 80 passengers and crew were killed.

 On 10 October 2006, Atlantic Airways Flight 670, a BAe 146-200A (registration OY-CRG), skidded off the runway while landing at Stord Airport, Norway. The spoilers did not deploy when the aircraft touched down. Sixteen people were on board; three passengers and one crew member were killed.

 On 9 April 2009, a BAe 146-300 belonging to Aviastar Mandiri, an Indonesian charter operator, crashed into Pike Mountain, Wamena, and burst into flames, killing all six crew after being ordered by the air traffic controller to abort the initial landing attempt.

 On 28 November 2016, LaMia Flight 2933, a chartered Avro RJ85 registered as CP-2933, flying from Viru Viru International Airport in Bolivia to Medellín, Colombia, as LaMia Flight 2933, crashed 10.5 miles (17 km) south of José María Córdova International Airport. Among the passengers were members of the Brazilian football team, Associação Chapecoense de Futebol, who were travelling to play their away-leg of the Final of the 2016 Copa Sudamericana in Medellín. Of the 77 occupants on board, 71 died.

Other incidents

 On 29 June 1994, a BAe-146-100, registration ZE700, overran the runway and suffered damages while trying to land at Islay Airport in the Inner Hebrides. The incident is notable because then-Prince Charles was at the controls but was not blamed because, despite being a licensed pilot, he was a passenger who was invited to fly the aircraft. Following the incident, Prince Charles forewent flying royal flights.

Aircraft on display

Australia
 3213 – BAe  forward fuselage on static display at the South Australian Aviation Museum in Adelaide, South Australia.

China

 E1019 (B-2701) – BAe  on static display at the Civil Aviation Museum of China in Cuigezhuang, Chaoyang District, Beijing

United Kingdom
 1010 – BAe  fuselage on static display at the de Havilland Aircraft Museum in London Colney, Hertfordshire
 E2351 – Avro  at the City of Norwich Aviation Museum in Horsham St Faith, Norfolk
 E3378 – RJX100 on static display at the Runway Visitor Park at Manchester Airport in Ringway, Greater Manchester.
 ZE700 – BAe 146 CC2 on static display at the South Wales Aviation Museum in St Athan, South Glamorgan
 ZE701 – BAe 146 CC2 on static display at the IWM Duxford in Duxford, Cambridgeshire

Specifications

See also

References

Sources

 
 Ashford, Norman J., Saleh Mumayiz and Paul H. Wright. "Airport Engineering: Planning, Design and Development of 21st Century Airports." John Wiley & Sons, 2011. .
 
 
 
 
 
 Hewish, Mark. "Britain's First New Airliner for 18 years." New Scientist, 94(1311), 24 June 1982. pp. 857–859.
 
 
 
 Velupillai, David. "British Aerospace 146 Described." Flight International, 2 May 1981. pp. 1243–1253.

External links

 Manufacturer website – BAe 146 – Avro RJ
 Smiliner 146 family information page

1980s British airliners
146
Hawker Siddeley aircraft
Quadjets
T-tail aircraft
Shoulder-wing aircraft
Aircraft with retractable tricycle landing gear