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Aircraft Boeing

What are the key differences between a commercial Airbus aircraft and a commercial Boeing Aircraft?

Which do you prefer?

Personally I prefer Boeing airliners but purely for political reasons. Most people when they walk aboard a small narrow body aircraft like a 737 or a A320 can't tell what type of airliner they're on unless they look at the safety card in that little pouch.
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If you were allowed to go into the cockpit (you're not) you would be able to tell immediately. The Boeing plane has the conventional stalk and steering wheel in front of the pilots whereas the Airbus uses a side mounted joystick like controller. So far Boeing has resisted the temptation to switch to this type of flight control because they feel the majority of pilots are more comfortable with the traditional controls.
Airbus:

http://www.airliners.net/photo/Virgin-America/Airbus-A320-214/1285250/L/&tbl=COCKPIT&photo_nr=26&prev_id=1292283&next_id=1281836

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Boeing:

http://www.airliners.net/photo/Alaska-Airlines/Boeing-737-990/1288888/L/&tbl=COCKPIT&photo_nr=2&prev_id=1351919&next_id=1180023

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There are of course plenty of other differences but this is the main difference that an everyday person might notice. The design of the cockpit windows is different as is the winglets at the end of the wings. Airbus uses what it calls a "wing tip fence" while the Boeing winglets are far more pronounce and only point upward.
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Notice the yellow wing tip fence on this Airbus A-320

http://www.airliners.net/photo/Vueling-Airlines/Airbus-A320-214/1353025/L/&tbl=photo_info&photo_nr=96&prev_id=1353039&next_id=1353015.

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Notice the difference when you see this photo of a Boeing 737 winglet.

http://www.airliners.net/photo/Lion-Airlines/Boeing-737-9GP-ER/1334037/L/&tbl=photo_info&photo_nr=38&prev_id=1334045&next_id=1334016

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Boeing $79.66 The Boeing Company is a major aerospace and defense corporation, founded by William E. Boeing in Seattle, Washington. Boeing has expanded over the years, merging with McDonnell Douglas in 1997. Its international headquarters has been in Chicago, Illinois, since 2001. Boeing is the largest global aircraft manufacturer by revenue, orders and deliveries, and the second largest aerospace and defense contractor in the world. Boeing is the largest exporter by value in the United States. Its stock is a component of the Dow Jones Industrial Average. Author: Miller, Frederic P./ Vandome, Agnes F./ McBrewster, John Binding Type: Paperback Number of Pages: 88 Publication Date: 2009/12/16 Language: English Dimensions: 5.98 x 9.01 x 0.21 inches

Boeing's New 707 Jet Aircraft, at the Boeing Plant $69.99 Nat Farbman Boeing's New 707 Jet Aircraft, at the Boeing Plant - Photographic Print

Factory Workers Relaxing Outside Boeing Aircraft Plant $79.99 Factory Workers Relaxing Outside Boeing Aircraft Plant - Premium Photographic Print

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Boeing 727 $81.25 The Boeing 727 is a midsize, narrowbody, threeengine, Ttailed commercial jet airliner. The first Boeing 727 flew in 1963 and for over a decade it was the most produced commercial jet airliner in the world. When production ended in 1984, a total of 1,831 aircraft had been produced. The 727s sales record for the most jet airliners ever sold was broken in the early 1990s by its younger stablemate, the Boeing 737. The 727 was produced following the success of the Boeing 707 quadjet airliner. Designed for shorthaul routes, the 727 became a mainstay of airlines domestic route networks. A stretched variant, the 727200, debuted in 1967. In August 2008, there were a total of 81 Boeing 727100 aircraft and 419 727200 aircraft in airline service. Author: Miller, Frederic P./ Vandome, Agnes F./ McBrewster, John Binding Type: Paperback Number of Pages: 124 Publication Date: 2010/07/29 Language: English Dimensions: 5.98 x 9.01 x 0.29 inches

Boeing XP9 $74.88 Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Boeing XP9 (company Model 96) was the first monoplane fighter aircraft produced by the United States aircraft manufacturing company Boeing. It incorporated sophisticated structural refinements that were influential in later Boeing designs. The sole prototype exhibited unsatisfactory characteristics with its lack of pilot visibility directly leading to its cancellation. Author: Miller, Frederic P./ Vandome, Agnes F./ McBrewster, John Binding Type: Paperback Number of Pages: 76 Publication Date: 2011/02/24 Language: English Dimensions: 5.98 x 9.02 x 0.18 inches

Boeing C22 $63.73 Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Boeing C22 was a US military version of the Boeing 727. The C22B, a 727100, was the primary mediumrange aircraft used by the Air National Guard and National Guard Bureau to airlift personnel. They operated 3 C22B (727100 based) aircraft. They also operate 1 C22C (727200based) aircraft. Author: Miller, Frederic P./ Vandome, Agnes F./ McBrewster, John Binding Type: Paperback Number of Pages: 72 Publication Date: 2011/02/23 Language: English Dimensions: 5.98 x 9.02 x 0.17 inches

Boeing Aircraft Factory Girl Marguerite Kershner, Working in Wire Room $79.99 Boeing Aircraft Factory Girl Marguerite Kershner, Working in Wire Room - Premium Photographic Print

Boeing Aircraft Factory Girl Marguerite Kershner, Checking in In the Morning $79.99 Boeing Aircraft Factory Girl Marguerite Kershner, Checking in In the Morning - Premium Photographic Print

Boeing Aircraft Factory Girl Linda Gray, Inspecting Wing Skins $79.99 Boeing Aircraft Factory Girl Linda Gray, Inspecting Wing Skins - Premium Photographic Print

Boeing Aircraft Factory Girls Linda Gray and Marguerite Kershner Riding Horses $79.99 Boeing Aircraft Factory Girls Linda Gray and Marguerite Kershner Riding Horses - Premium Photographic Print

Space Shuttle Endeavour Mounted on a Modified Boeing 747 Shuttle Carrier Aircraft $24.99 Stocktrek Images Space Shuttle Endeavour Mounted on a Modified Boeing 747 Shuttle Carrier Aircraft - Photographic Print

Boeing Aircraft Factory Girl Linda Gray, Inspecting a Strip of Spot Welds $79.99 Boeing Aircraft Factory Girl Linda Gray, Inspecting a Strip of Spot Welds - Premium Photographic Print

Boeing XP15 $63.73 Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Boeing XP15 was a prototype monoplane fighter of the United States, the second to be designated a pursuit type, after the Boeing XP9. This aircraft was essentially a monoplane version of the Boeing P12, differing in having the lower wing omitted and in having allmetal construction as well as altered ailerons. The XP15 had a splitaxle undercarriage and a tail wheel. Author: Miller, Frederic P./ Vandome, Agnes F./ McBrewster, John Binding Type: Paperback Number of Pages: 68 Publication Date: 2011/02/24 Language: English Dimensions: 5.98 x 9.02 x 0.16 inches

Boeing X45 $70.1 The Boeing X45 unmanned combat air vehicle is a concept demonstrator for a next generation of completely autonomous military aircraft, developed by Boeings Phantom Works. Manufactured by Boeing Integrated Defense Systems, the X45 is part of DARPAs JUCAS project. Author: Miller, Frederic P./ Vandome, Agnes F./ McBrewster, John Binding Type: Paperback Number of Pages: 84 Publication Date: 2010/07/27 Language: English Dimensions: 5.98 x 9.01 x 0.20 inches

Boeing E767 $86.03 Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Boeing E767 is an Airborne Early Warning and Control aircraft. It was designed in response to the Japan Air SelfDefense Forces requirements, and is essentially the E3 Sentry mission package on a Boeing 767200 platform. Author: Miller, Frederic P./ Vandome, Agnes F./ McBrewster, John Binding Type: Paperback Number of Pages: 104 Publication Date: 2011/02/23 Language: English Dimensions: 5.98 x 9.02 x 0.25 inches

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Story of Boeing's Hydrogen Fuel Cell Aircraft



How are the engines started on a large aircraft, eg Boeing 777.?

Also can the engines on a large aircraft be started without ground based power systems, eg. electric power, or compressed air ?

Most commercial jets have an APU which has been discussed on here already. What it does is use the thrust to power a compressor mounted shaft, similar to turbine helecopters using the power to spin something rather than to just provide thrust.

The shaft drives a generator to provide AC power to the aircraft for lighting, instruments, start switches etc.
Some APU's use a shaft that drives an air compressor to provide bleed air for airconditioning and to provide bleed air to spin the N2 compressor. While some extract air from the compressor section of the APU.

Most startup procedures require starting the APU which requires DC power from the batteries or ground source. The APU doesn't need bleed air from another source making it self reliant, however it does require a minimum of 23 volts from a source to start the APU (737-300).

When the APU has achieved starter cutout speed a blue light indicates that APU generator power is available, so switching the APU generator switches transfers power from the DC (battery) to the AC (generator). Often this is noticed by the brief flickering on the cabin lights). The APU at this stage will charge the DC power battery when DC standby power is needed (ie all generator loss), and when the engines are online and on the generator buses this will also power the standby source.

The APU at this stage is powering the electric for the aircraft systems, however in order to start the engines it requires bleed air.
Bleed air is compressed air bled from a source such as the compressor 5th 9th stage of the engine.
(This provides compressed air to spin the N2 blades on the engine, wing anti-ice/cowl or for pressurisation purposes it is cooled, filtered trhough a water seperator and heated through the airconditioning packs and fed through the mix manfold where it is sent around the cabin).

When the APU at this stage is providing bleed air, often if the packs are left on for air conditoning purposes. You may notice on some startups that the airconditoning briefly turns off when the engines starts.
This becuase in order to air start the N2 blade section of the engine, duct pressure in excess of 30psi needs to be achieved in order to engage the start switch. This provided adequate N2 rotation for combustion.
Once the packs are swtiched off, the duct pressure rises above 30psi allowing enough air pressure to start the engine.
When the N2 compressor reaches max motoring speed, the maximum that it can spin (25% N1), fuel is then fed by moving a lever, fuel is fed into combustion part of the engine where combustion is achieved.
Once N2 reaches 46% the start swtiches would switch off.

When the engienhas stabilised the APU is used again to provide bleed air and AC power to the other engine.
When both engines are powered, the APU is often made redundant since both engines can now provide adequate bleed air for pressurisation, anti-ice and AC power to provide electricity to systems.
So the APU is swtiched off, and again the flickerinf of the lights suggest a transfer of power.

If and when the APU is redundant on the ground, compressor carts on the ground when fed into the mix manifold can provide adequate bleed air to start an engine.
A compressor cart needs to be able to provide at least 125 pounds per minute of air.
AC power or DC power with a minimum of 23 volts is sufficient to start an engine, so external or battery power is used in congunction with external air source.

A cross bleed start can be achieved when one engine is operative without APU bleed air.
However air bled from an idle engine isn't adequate enough to provide at least 30psi.
So in order to achieve enough duct pressure from a one engine bleed air source, thrust has to be applied to that engine to raise the duct pressure for air start on the second engine.
Due to the hazard of FOD and risk of injury to ground personnel, cross bleed starts are rarely used.

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