kenanc
Topic Author
Posts: 185
Joined: Fri Aug 23, 2013 3:36 am

### Landing Gear Questions

How is the amount of wheels of any plane determined? Yes, most likely weight, but how many kg. or lbs. to each wheel?

There are a couple other inquiries I have:

Why are the 767 main landing gear faced 'backward' as compared to most other aircraft?

Why is there a gap in between the A330 main landing gear? If there is a reason, why are other aircraft's landing gear so close?

Thanks,

KenanC

musang
Posts: 788
Joined: Sun Apr 08, 2001 4:11 am

### RE: Landing Gear Questions

On the 767 gear:-

Why Do 767s Wheels Hang Forwards? (by RobK Apr 10 2008 in Tech Ops)?threadid=223723&searchid=224456&s=gear+angle#ID224456

Number of wheels - necessity to spread the weight over an area of surface. Runway/taxiway/apron surfaces are all given bearing strength figures. We can look them up in a book for any airport we have to make an unscheduled visit to, and of course they are known to the aircraft designers. The often quoted example is the early Indian Airlines A320s, given a specially designed 8 wheel main gear because of the weak surfaces the airline flew to.

Not sure what you mean on the A330 gear........

Regards - musang

bohica
Posts: 2375
Joined: Tue Feb 10, 2004 3:21 pm

### RE: Landing Gear Questions

 Quoting musang (Reply 1):Not sure what you mean on the A330 gear........

I believe he is referring to the space between the front and rear axles on the A330 main landing gears. They are spaced that far apart to distribute the weight on the ground better. Comparing it to a 767, the A330 is a heavier airplane than the 767. If the front and rear axles were spaced the same as the 767, the weight would be concentrated on a smaller area, possibly causing damage to the surface. By spreading out the axles, the same weight is distributed over a larger area without having to add wheels or another landing gear, which obviously would add weight to the plane.

WingedMigrator
Posts: 1770
Joined: Wed Oct 26, 2005 9:45 am

### RE: Landing Gear Questions

 Quoting KenanC (Thread starter):how many kg. or lbs. to each wheel?

Can be north of 30 metric tons per wheel, or double the load per wheel of a freight locomotive.

wingscrubber
Posts: 815
Joined: Fri Sep 07, 2001 1:38 am

### RE: Landing Gear Questions

There's a nice landing gear powerpoint on the A380 here:
http://www.fzt.haw-hamburg.de/pers/S...hh/text_2008_06_05_LandingGear.pdf

It discusses the design process that went into developing the A380 gear. Although an extreme example, all aircraft designs flying today have gone through a similar process.
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