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Rare Visitor: Beech 1900D F-HAPE TwinJet - Landing/close up/Take off - Gloucestershire Airport
Rare Visitor: Beech 1900D F-HAPE TwinJet - Landing/close up/Take off - Gloucestershire Airport
Published: 2015/12/31
Channel: cpockett
TWIN JET PART 1.wmv
TWIN JET PART 1.wmv
Published: 2010/05/05
Channel: ThePaperAirplaneGuy
Twinjet SJ-1607 Printer
Twinjet SJ-1607 Printer
Published: 2016/02/10
Channel: JW Media Wholesale & Commercial Printing
Démarrage des moteurs du TwinJet / Aviapartner Toulouse
Démarrage des moteurs du TwinJet / Aviapartner Toulouse
Published: 2010/03/01
Channel: Jujug Spotting
Landing to Metz-Nancy-Lorraine Airport Beechcraft 1900D TWIN JET
Landing to Metz-Nancy-Lorraine Airport Beechcraft 1900D TWIN JET
Published: 2016/02/23
Channel: Fanairlines WAGNER
How to make a Twin Jet RC Boat Using Turbo Jet Motor
How to make a Twin Jet RC Boat Using Turbo Jet Motor
Published: 2017/02/26
Channel: Creative Channel
FlyJSim 732 TwinJet Full Flight KLAX - KLAS on PilotEdge
FlyJSim 732 TwinJet Full Flight KLAX - KLAS on PilotEdge
Published: 2014/06/01
Channel: catstrator
Twinjet mit Lambert Microturbine - Testflug
Twinjet mit Lambert Microturbine - Testflug
Published: 2012/04/08
Channel: RALFausO
twinjet
twinjet
Published: 2013/10/07
Channel: CNCinforu
Pilatus Unveils PC-24 TwinJet
Pilatus Unveils PC-24 TwinJet
Published: 2013/05/22
Channel: AVweb
Bogner Uberschall Twin Jet Demo by Josh Wibaut Part 1: Testing123reviews @ Guitar Guitar Birmingham
Bogner Uberschall Twin Jet Demo by Josh Wibaut Part 1: Testing123reviews @ Guitar Guitar Birmingham
Published: 2011/04/17
Channel: Josh Wibaut
FLYJSIM 737 TWINJET FIRST IMPRESSIONS
FLYJSIM 737 TWINJET FIRST IMPRESSIONS
Published: 2014/12/10
Channel: frooglesim
Multiplex RC Twinjet with Jet Engine Extremely fast
Multiplex RC Twinjet with Jet Engine Extremely fast
Published: 2014/04/21
Channel: Aviatorathome
BOGNER Uberschall Twin Jet & TWO NOTES Torpedo Live - Metal (Clean & High-Gain)
BOGNER Uberschall Twin Jet & TWO NOTES Torpedo Live - Metal (Clean & High-Gain)
Published: 2016/12/04
Channel: Daniel Golla
twin jet
twin jet
Published: 2012/05/07
Channel: vvtf60
FLYJSIM 737 TWINJET - LANDING IN GENEVA
FLYJSIM 737 TWINJET - LANDING IN GENEVA
Published: 2014/12/12
Channel: frooglesim
TeeJet TwinJet Family of Spray Tips
TeeJet TwinJet Family of Spray Tips
Published: 2016/01/31
Channel: TeeJet
FlyJSim Boeing 732 TwinJet for X-plane 10
FlyJSim Boeing 732 TwinJet for X-plane 10
Published: 2016/08/31
Channel: Thomas Rasmussen
Aviones de Papel 3. "Twin Jet"
Aviones de Papel 3. "Twin Jet"
Published: 2016/03/28
Channel: Aviones de papel
Gotta Have It TV - Maverick Twinjet
Gotta Have It TV - Maverick Twinjet
Published: 2007/03/03
Channel: GottaHaveItTV
YAMAHA YL1 100cc TWINJET - Original and still in use today!
YAMAHA YL1 100cc TWINJET - Original and still in use today!
Published: 2009/05/15
Channel: rosscoYL1
EXTREME RC ELECTRIC PLANE MULTIPLEX TWINJET, ¡2600 WATS!, 188 AMP, PASS TO 220 KMH wmv
EXTREME RC ELECTRIC PLANE MULTIPLEX TWINJET, ¡2600 WATS!, 188 AMP, PASS TO 220 KMH wmv
Published: 2010/08/29
Channel: tonivtr
Bogner Uberschall Twin Jet 2015
Bogner Uberschall Twin Jet 2015
Published: 2015/04/14
Channel: RezaMatix
Multiplex Brushless Eagle Twin Jet mit 3S -11,1 V
Multiplex Brushless Eagle Twin Jet mit 3S -11,1 V
Published: 2016/01/14
Channel: Frank Weigel
SCUBAPRO TWIN JET Fins
SCUBAPRO TWIN JET Fins
Published: 2013/10/23
Channel: Scubapro
twin jet turbine powered gokart
twin jet turbine powered gokart
Published: 2015/07/21
Channel: Ryan Winter
Kärcher Twin Jet
Kärcher Twin Jet
Published: 2014/01/31
Channel: KÄRCHER CENTER Müller
Charity Shop Gold or Garbage Silverlit X Twin Jet RC Plane Flying - Nanny Camera
Charity Shop Gold or Garbage Silverlit X Twin Jet RC Plane Flying - Nanny Camera
Published: 2016/07/18
Channel: GrandadIsAnOldMan
TWINJET MULTIPLEX DIRECTORSCUT
TWINJET MULTIPLEX DIRECTORSCUT
Published: 2007/07/29
Channel: Mike
[Amp Shootout] Bogner Uberschall Twin Jet vs. Bogner Helios 50 - Metal
[Amp Shootout] Bogner Uberschall Twin Jet vs. Bogner Helios 50 - Metal
Published: 2017/02/18
Channel: Daniel Golla
Graupner Bell 212 TwinJet
Graupner Bell 212 TwinJet
Published: 2014/04/21
Channel: HeliChrissi
LARGE SCALE RC Twin Jet Engine Su-27 "FLANKER" [*UltraHD and 4K*]
LARGE SCALE RC Twin Jet Engine Su-27 "FLANKER" [*UltraHD and 4K*]
Published: 2017/04/07
Channel: Essential RC
TeeJet TTJ60 Turbo TwinJet Spray Tip Drift Demo
TeeJet TTJ60 Turbo TwinJet Spray Tip Drift Demo
Published: 2016/03/10
Channel: TeeJet
Bogner Uberschall Original Vs. Bogner Uberschall Twin Jet (EL34)
Bogner Uberschall Original Vs. Bogner Uberschall Twin Jet (EL34)
Published: 2015/10/12
Channel: Nine Four Recordings
TwinJet
TwinJet
Published: 2016/09/05
Channel: НОУ "Международный Центр Психологии и Языкознания"
[Livestream] Flight Angels 2016 ✈️ FlyJSim 732 TwinJet ✈️ KLAS - KBUR
[Livestream] Flight Angels 2016 ✈️ FlyJSim 732 TwinJet ✈️ KLAS - KBUR
Published: 2016/09/18
Channel: catstrator
Scubapro twin jet demo vid
Scubapro twin jet demo vid
Published: 2010/06/22
Channel: Yatty1833
18000 Horsepower Twin Jet Supercar!
18000 Horsepower Twin Jet Supercar!
Published: 2016/08/14
Channel: Morozov Automotive
TWINJET TF1808 Industrial Belt Textile Printer
TWINJET TF1808 Industrial Belt Textile Printer
Published: 2016/06/21
Channel: TWINJET Printer - www.twinjet.com.cn
1966 YAMAHA YL1 TWIN JET
1966 YAMAHA YL1 TWIN JET
Published: 2012/07/12
Channel: oldalnoll
1967 Yamaha YL1 Twinjet
1967 Yamaha YL1 Twinjet
Published: 2010/04/26
Channel: Connal Z. Pimpallic
TeeJet Turbo TwinJet Distribution Quality
TeeJet Turbo TwinJet Distribution Quality
Published: 2016/01/28
Channel: TeeJet
TWINJET ELASTEX 1800
TWINJET ELASTEX 1800
Published: 2014/05/09
Channel: TWINJET Printer - www.twinjet.com.cn
TWIN JET PART 2.wmv
TWIN JET PART 2.wmv
Published: 2010/05/05
Channel: ThePaperAirplaneGuy
BACCI - 6-AXES CNC MACHINE MODEL TWIN-JET
BACCI - 6-AXES CNC MACHINE MODEL TWIN-JET
Published: 2013/05/15
Channel: PAOLINOBACCIsrl
TWINJET SJ SERIES SJ1816 PRO
TWINJET SJ SERIES SJ1816 PRO
Published: 2014/12/19
Channel: Viradijital
ReampZone Uberschall Twin Jet Kemper Pack
ReampZone Uberschall Twin Jet Kemper Pack
Published: 2017/07/07
Channel: John Huldt
RARE! Twin Jet Beechcraft 1900D [F-GLNE] Landing at Berlin Tegel Airport (TXL) [Full HD]
RARE! Twin Jet Beechcraft 1900D [F-GLNE] Landing at Berlin Tegel Airport (TXL) [Full HD]
Published: 2017/04/25
Channel: PlaneSpottingBerlin ✈ Aviation Videos
EXPRESS-SHOP.TV     Aqua Laser "TwinJet"
EXPRESS-SHOP.TV Aqua Laser "TwinJet"
Published: 2016/04/05
Channel: ExpressShopTV
1966 YAMAHA 100 Twin Jet - Riding The Classics
1966 YAMAHA 100 Twin Jet - Riding The Classics
Published: 2015/12/08
Channel: RacerRed
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WIKIPEDIA ARTICLE

From Wikipedia, the free encyclopedia
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Boeing 737 Twinjet
The Vought F7U Cutlass was one of the first modern twinjet fighters.

A twinjet or twin-engine jet is a jet aircraft powered by two engines. Such configuration of an aircraft is the most popular today for commercial airliners, for fighters, and many other kinds, because while offering safety from a single engine failure,[1] it is also acceptably fuel-efficient.[2]

Aircraft configurations[edit]

As of today, there are three most common configurations of twinjet aircraft. The first has a podded engine usually mounted beneath, or occasionally above or within, each wing, usually for standard narrow-body and wide-body airliners.

The second has one engine mounted on each side of the rear fuselage, close to its empennage, which is common among most business jets.

In the third configuration, both jet engines are within the fuselage, side-by-side, which is notable for being used on most fighters since the 1960s, and still continuing, for example in the Su-27 'Flanker', the F-15 Eagle, and the F-22 Raptor.

History[edit]

The first "twinjet" ever to fly was the April 1941-debuted German fighter prototype Heinkel He 280, flying with a pair of nacelled Heinkel HeS 8 axial-flow turbojets.

The twinjet configuration was originally suitable for the short-range narrow-body such as the McDonnell Douglas DC-9 and Boeing 737. The Airbus A300 was initially not successful when first produced as a short-range widebody, as airlines operating the A300 on short haul routes were forced to reduce frequencies to try and fill the aircraft and so they lost passengers to airlines operating more frequent narrow body flights. However, thanks to the introduction of ETOPs that allowed twin-engine jets to fly long-distance routes that were previously off-limits to them, Airbus was able to further develop the A300 as a medium/long range airliner to increased sales, and Boeing launched its widebody twinjet, the Boeing 767, in response.

In the 1980s the Boeing 727 was discontinued, as its central engine bay would require a prohibitively expensive redesign to accommodate quieter high-bypass turbofans, and it was soon supplanted by twinjets for the narrow-body market; Airbus with the A320, and Boeing with the 757 and updated "classic" variants of the 737. During that decade only McDonnell Douglas continued development of the trijet design with an update to the DC-10, the MD-11, which initially had a range advantage over its closest medium wide-body competitors which were twinjets, the in-production Boeing 767 and upcoming Airbus 330. In contrast to McDonnell Douglas sticking with their existing trijet configuration, Airbus (which never produced a trijet aircraft) and Boeing worked on new widebody twinjet designs that would become the Airbus A330 and Boeing 777, respectively. The MD-11's long range advantage was brief as it was soon nullified by the Airbus A330's four-engine derivative, the Airbus A340, and the extended-range Boeing 767-300ER and Boeing 777-200ER.

The Boeing 737 twinjet stands out as the most produced jet airliner. The Boeing 777 is the world's largest twinjet, and the 777-200LR variant is the world's longest range airliner. Other Boeing twinjets include the 767, 757 (out of production but still in commercial service) and 787. Competitor Airbus produces the A320 family, the A330, and the A350.

Some modern commercial airplanes still use four engines (quad-jets) like the Airbus A380 and Boeing 747-8, which are classified as very large aircraft (over 400 seats in mixed-class configurations). Four engines are still used on the largest cargo aircraft capable of transporting outsize cargo, including strategic airlifters. There are plans to revive production of 6 engine giants like the Antonov An-225 Mriya.

Efficiency[edit]

Twin jets tend to be more fuel-efficient than trijet (three engine) and quad-jet (four engine) aircraft. As fuel efficiency in airliners is a high priority, many airlines are increasingly retiring trijet and quad-jet designs in favor of twinjets since the 2000s. The trijet designs were phased out first, in particular due to the more complicated design and maintenance issues of the middle engine mounted on the stabilizer. The quad-jet design was favored over early twinjets for long-haul trans-oceanic routes due to its immunity from ETOPS restrictions, and these also tended to have higher passenger/cargo capacities as well, however modern twinjets such as the Boeing 777 and Airbus A350 have matched or surpassed older quad-jet designs such as the Boeing 747 and Airbus A340 in these aspects, and twinjets have been more successful in terms of sales than quad-jets.

ETOPS[edit]

When flying far from diversionary airports (so called ETOPS/LROPS flights), the aircraft must be able to reach an alternate on the remaining engine within a specified time in case of one engine failure. When aircraft are certified according to ETOPS standards, thrust is not an issue, as one of the engines is more than powerful enough to keep the aircraft aloft (see below). Mostly, ETOPS certification involves maintenance and design requirements ensuring that a failure of one engine cannot make the other one fail also. The engines and related systems need to be independent and (in essence) independently maintained. ETOPS/LROPS is often incorrectly thought to apply only to long overwater flights, but it applies to any flight more than a specified distances from an available diversion airport. Overwater flights near diversion airports need not be ETOPS/LROPS-compliant.

Introduction to transoceanic flights[edit]

Since the 1990s, airlines have increasingly turned from four-engine or three-engine airliners to twin-engine airliners to operate Transatlantic flight and Transpacific flight routes. On a nonstop flight from America to Asia the long-range aircraft usually follows the great circle route. Hence, in case of an engine failure in a twinjet (like Boeing 777), it is never too far from an emergency landing field in western Canada, Alaska, or eastern Russia. The Boeing 777 has also been approved by the Federal Aviation Administration for flights between North America and Hawaii, which is the world's longest[citation needed] regular airline route with no diversion airports along the way.

Other advantages[edit]

On large passenger jets, the cost of the engines makes up a significant proportion of the plane's final cost. Each engine also requires separate service, paperwork, and certificates. Thus, having two larger engines as opposed to three or four smaller engines will significantly reduce both the purchase and maintenance costs of a plane.

Regulations governing the required thrust levels for transport aircraft are typically based upon the requirement that an aircraft be able to continue a takeoff if an engine fails after the takeoff decision speed is reached.[3] Thus, with all engines operating, trijets must be able to produce at least 150% of the minimum thrust required to climb and quad-jets 133%. Conversely, since a twinjet will lose half of its total thrust if an engine fails, they are required to produce 200% of the minimum thrust required to climb when both engines are operating. Because of this, twinjets will typically have higher thrust-to-weight ratios than aircraft with three or more engines and are thus able to accelerate and climb faster.

See also[edit]

References[edit]

  1. ^ Peterson, Barbara (2014-07-16). "For Transoceanic Flights, Are Two Engines Enough?". Popularmechanics.com. Retrieved 2016-11-29. 
  2. ^ "Aerospace | Popular Science". Popsci.com. 2015-11-18. Retrieved 2016-11-29. 
  3. ^ "14 CFR 25.121 - Climb: One-engine-inoperative.". law.cornell.edu. 2014-11-04. Retrieved 2017-04-14. 

External links[edit]

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