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HAWK21M
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AN-124 Nose Wheel Steering

Wed Mar 23, 2005 1:39 am

Can anyone explain the AN124 Nose wheel steering,considering there are Two parallel nose wheels.Is there a ratio crank.How does the Steering mechanism work.Any pics.
regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
sovietjet
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RE: AN-124 Nose Wheel Steering

Wed Mar 23, 2005 7:40 am

They both turn at the same time. No ratio they both turn the same amount. It's the same with the An-225.


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HAWK21M
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RE: AN-124 Nose Wheel Steering

Wed Mar 23, 2005 6:11 pm

Wouldn't that affect the steering & tire wear if they moved the same amount on a turn.
Shouldn't a Ratio be applied.
regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
EconoBoy
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RE: AN-124 Nose Wheel Steering

Wed Mar 23, 2005 7:27 pm

It might cause some tyre scrub, but that's probably tiny compared with the wear caused by landing, and not worth the extra weight of a ratio device.
 
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HAWK21M
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RE: AN-124 Nose Wheel Steering

Wed Mar 23, 2005 9:38 pm

Quoting EconoBoy (Reply 3):
It might cause some tyre scrub, but that's probably tiny compared with the wear caused by landing, and not worth the extra weight of a ratio device.

I wonder why the A380 never considered the same type of Nose Gears.
regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
FredT
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RE: AN-124 Nose Wheel Steering

Wed Mar 23, 2005 11:00 pm

A ratio device doesn't really have to add any complexity. You have it in every car. The point is to have the axle of each wheel (or pair of wheels) pointed towards the same spot on a line through the main (rear) wheels.

A significant amount of the wear on aircraft tires comes from taxiing, which is one reason why it is not worth bothering to spin up the tyres prior to touch down.
I thought I was doing good trying to avoid those airport hotels... and look at me now.
 
EconoBoy
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RE: AN-124 Nose Wheel Steering

Thu Mar 24, 2005 12:57 am

I think the device used in cars is called an Ackerman linkage. It's very simple in a car, but harder to incorporate into a retractable undercarriage. Otherwise you could use software interpret the pilots commands and turn the nosewheels the right amount. Again, is it worth the hassle/cost?
Incidentally, the undercarriage used on the B52 is pretty interesting as all four carriages can be steered to allow crabbing in cross winds - there must have been some interlocking there to keep all the gear pointing in the same direction.

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