FredT From United Kingdom, joined Feb 2002, 2185 posts, RR: 26 Reply 5, posted (8 years 8 months 2 weeks 5 days 12 hours ago) and read 2260 times:
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 From United Kingdom, joined Mar 2004, 157 posts, RR: 0 Reply 6, posted (8 years 8 months 2 weeks 5 days 10 hours ago) and read 2242 times:
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.