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Faro
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A350: Why Such Wide Wheel Spacing?

Thu Jul 04, 2013 8:20 am

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
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zeke
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RE: A350: Why Such Wide Wheel Spacing?

Thu Jul 04, 2013 1:52 pm

Setup for a 3 wheel bogie from what I recall. It should also reduced the pavement load, depending on the pavement type.
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LH707330
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RE: A350: Why Such Wide Wheel Spacing?

Thu Jul 04, 2013 5:32 pm

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?
 
Klaus
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RE: A350: Why Such Wide Wheel Spacing?

Fri Jul 05, 2013 4:13 am

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.
 
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Faro
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RE: A350: Why Such Wide Wheel Spacing?

Fri Jul 05, 2013 7:30 am

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
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KarelXWB
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RE: A350: Why Such Wide Wheel Spacing?

Fri Jul 05, 2013 12:08 pm

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:

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