Moderators: richierich, ua900, PanAm_DC10, hOMSaR

 
User avatar
metalinyoni
Topic Author
Posts: 310
Joined: Mon Oct 10, 2005 8:52 pm

Undercarriage Design: Boeing V. Airbus

Sat Nov 29, 2014 7:03 am

When looking at photos of aircraft I have noticed that Airbus tend to leave a greater space between the wheels on the undercarriage of their aircraft than does Boeing. What are the advantages of this approach? Does it not take up greater space in the hold?

Looking at the photos of A330 v B767:

A330
https://www.airliners.net/photo/Skyma...d=67fc7699329229138d62f7f2fa09081d

B767
https://www.airliners.net/photo/Unite...d=149c5dcef963b645bf95cd982a2ddb10

And the A350 v B787

B787
https://www.airliners.net/photo/Haina...d=5dec12535531681df64bb1b3539b477a

A350
https://www.airliners.net/photo/Airbu...d=d1a81f1e771707605f38180d34293b1b

[Edited 2014-11-28 23:08:12]
300, 310, 319, 320, 321, 332, 333, 342, 343, 345, 346, 380, 707, 727, 732, 733, 734, 735, 73G, 738, 742, 74L, 743, 744, 752, 753, 762, 763, 764, 772, 77L 773, 77W, D10, AT46, AT76, AT75, 142, DH3, ER4, AR1, AR8
 
Part147
Posts: 386
Joined: Tue Dec 16, 2008 3:13 pm

RE: Undercarriage Design: Boeing V. Airbus

Sat Nov 29, 2014 9:43 am

Two examples doth not an Airbus vs Boeing philosophy make!


Have you considered that the wheel sizes your looking at just might be different? That the gap vs wheel diameters ratios might not be a good indicator of the actual distance between them?

What if body-gear steering is fitted? Camera angle, parallax errors, even the wheel behind can give you a false perception of 'the gap'.
It's better to ask a stupid question during training, rather than make a REALLY stupid mistake later on!
 
LH707330
Posts: 2317
Joined: Fri Jun 15, 2012 11:27 pm

RE: Undercarriage Design: Boeing V. Airbus

Sat Nov 29, 2014 5:53 pm

In all of those paired examples you listed, the Airbus one was the heavier of the two. It's not an A v B thing so much as a ground loading one. Larger planes need larger tires and more spaced out wheels to stay below a certain pavement loading threshold.
 
User avatar
Stitch
Posts: 27094
Joined: Wed Jul 06, 2005 4:26 am

RE: Undercarriage Design: Boeing V. Airbus

Sat Nov 29, 2014 7:38 pm

Quoting metalinyoni (Thread starter):
And the A350 v B787

In the case of these two airplanes, the A350 undercarriage will come in both a double-bogey and triple-bogey variant (the latter for the A350-1000) so that might play some role in terms of tire spacing (though the A350-900 and A350-1000 undercarriage are manufactured by different companies).



[Edited 2014-11-29 11:41:07]
 
wingscrubber
Posts: 823
Joined: Fri Sep 07, 2001 1:38 am

RE: Undercarriage Design: Boeing V. Airbus

Mon Dec 01, 2014 8:24 pm

I'm sure that landing gear wheel spacing is probably semi-standardised, based on optimal pavement loading and tyre sizing. Bear in mind too that neither Boeing nor Airbus 'make', landing gear, they buy their gears as complete shipsets from a fairly limited number of suppliers who all do things a similar way.

If you're interested in the riveting topic of tyre pavement loading, here's a couple of boeing examples;
http://www.boeing.com/assets/pdf/com...ercial/airports/acaps/7474sec7.pdf
http://www.boeing.com/assets/pdf/commercial/airports/acaps/737sec7.pdf
Resident TechOps Troll
 
User avatar
LAX772LR
Posts: 13227
Joined: Sun Nov 09, 2014 11:06 pm

RE: Undercarriage Design: Boeing V. Airbus

Tue Dec 02, 2014 12:19 am

some OT side-note..... if an A359(L)R does come to fruition, what do you think is the probability that it will have the 6wheel bogie instead of the -900's current 4?
I myself, suspect a more prosaic motive... ~Thranduil
 
User avatar
Stitch
Posts: 27094
Joined: Wed Jul 06, 2005 4:26 am

RE: Undercarriage Design: Boeing V. Airbus

Tue Dec 02, 2014 12:26 am

Quoting LAX772LR (Reply 5):
some OT side-note..... if an A359(L)R does come to fruition, what do you think is the probability that it will have the 6wheel bogie instead of the -900's current 4?

It was planned from the beginning that both the ULR and the freighter versions of the A350-900 would use the six-wheel bogie as they would have a similar MTOW to the A350-1000.
 
User avatar
LAX772LR
Posts: 13227
Joined: Sun Nov 09, 2014 11:06 pm

RE: Undercarriage Design: Boeing V. Airbus

Tue Dec 02, 2014 6:58 am

Oh cool, didn't know that.

Airbus' website is pretty horrible for information on future models.... granted, I haven't looked as intensely as possible, but there's practically nothing about the A330NEO in the main facade of their site.
I myself, suspect a more prosaic motive... ~Thranduil

Who is online

Users browsing this forum: ual777 and 30 guests

Popular Searches On Airliners.net

Top Photos of Last:   24 Hours  •  48 Hours  •  7 Days  •  30 Days  •  180 Days  •  365 Days  •  All Time

Military Aircraft Every type from fighters to helicopters from air forces around the globe

Classic Airliners Props and jets from the good old days

Flight Decks Views from inside the cockpit

Aircraft Cabins Passenger cabin shots showing seat arrangements as well as cargo aircraft interior

Cargo Aircraft Pictures of great freighter aircraft

Government Aircraft Aircraft flying government officials

Helicopters Our large helicopter section. Both military and civil versions

Blimps / Airships Everything from the Goodyear blimp to the Zeppelin

Night Photos Beautiful shots taken while the sun is below the horizon

Accidents Accident, incident and crash related photos

Air to Air Photos taken by airborne photographers of airborne aircraft

Special Paint Schemes Aircraft painted in beautiful and original liveries

Airport Overviews Airport overviews from the air or ground

Tails and Winglets Tail and Winglet closeups with beautiful airline logos