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A350: Why Such Wide Wheel Spacing?  
User currently offlinefaro From Egypt, joined Aug 2007, 1534 posts, RR: 0
Posted (1 year 3 weeks 6 days 10 hours ago) and read 4927 times:

Like the question says, it seems that the A350 would have the widest spacing between wheels on its MLG. Does this in any way decrease the loading on paved surfaces? In any case it carries a weight penalty for the longer axle lenght so there must be an offsetting benefit somewhere.


Faro


The chalice not my son
5 replies: All unread, jump to last
 
User currently offlinezeke From Hong Kong, joined Dec 2006, 8879 posts, RR: 75
Reply 1, posted (1 year 3 weeks 6 days 4 hours ago) and read 4752 times:

Setup for a 3 wheel bogie from what I recall. It should also reduced the pavement load, depending on the pavement type.


We are addicted to our thoughts. We cannot change anything if we cannot change our thinking – Santosh Kalwar
User currently offlineLH707330 From United States of America, joined Jun 2012, 732 posts, RR: 0
Reply 2, posted (1 year 3 weeks 6 days 1 hour ago) and read 4603 times:

I think faro is wondering about the Z-axis spacing, the triple-bogie goes along the X-axis. My guess is that it's because the A350-900 is the heaviest planes with an 8-wheel main gear, so they need to be spaced apart to keep pavement loading within limits. Does anyone know if there's an 8-bogie plane with >268 ton MTOW?

User currently onlineKlaus From Germany, joined Jul 2001, 21416 posts, RR: 54
Reply 3, posted (1 year 3 weeks 5 days 14 hours ago) and read 4254 times:

As far as I've seen, the MLG layout is supposed to be different for all three versions – the -800 is supposed to have narrower 4-wheel bogies than the -900, which would indeed suggest optimized MLG weight vs. load distribution needs.

User currently offlineFaro From Egypt, joined Aug 2007, 1534 posts, RR: 0
Reply 4, posted (1 year 3 weeks 5 days 11 hours ago) and read 4156 times:

The *only* way I can understand the lower pavement loading afforded by the A359 MLG design is if the MLG axle width precludes having two MLG wheels impinging on the same pavement 'block' at the same time, ie the axle width is greater than block length and width. Is this the case?


Faro



The chalice not my son
User currently offlineKarelXWB From Netherlands, joined Jul 2012, 10866 posts, RR: 32
Reply 5, posted (1 year 3 weeks 5 days 6 hours ago) and read 3999 times:

Quoting Klaus (Reply 3):
As far as I've seen, the MLG layout is supposed to be different for all three versions – the -800 is supposed to have narrower 4-wheel bogies than the -900, which would indeed suggest optimized MLG weight vs. load distribution needs.

Correct. This picture shows the narrower 4-wheel bogie for the -800:




Only two things are infinite, the universe and human stupidity. And I'm not sure about the universe.
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