I flew almost all Boeings. They all use a single short tiller arm to the left side of the captain. Using it is the only way to get around sharp corners. The rudder pedals have some tie in on the nosewheel steering, but only about 1/10 the effect, so rudder steering is only practicable with gently steering requirements, such as minor steering on take-off or on straight taxiways. Some airlines buy the extra option of a second tiller on the right hand side. Following B737s in particular, it's peculiar seeing how they in fact crab along taxiing. The dynamics are a bit vague, but the main undercarriage legs obviously twist slightly. It's odd to see them going slightly sideways- even the pilots would be unaware, but you can see it following them.
Once you get below F27/HS748 twin turboprop size, I believe tillers are quite unusual, and never fitted to smaller aeroplanes.
The other really weird thing to see in aviation is the way on the ground, the DC9/MD82 series have elevators that are flapping freely apparently unconnected to anything!
Last edited by Notso Fantastic; 18th Sep 2012 at 17:57.