From: Jim Messina <firstname.lastname@example.org> Organization: NeoSoft, Inc. Date: 01 Oct 96 23:56:39 References: 1 2 3 4 Followups: 1
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On 25 Sep 1996, Jos Gielen wrote: > >On 13 Sep 1996, MikeM727 wrote: > >> behind a 737. From behind, they seem to be bent while taxiing! What I > >> mean is, while the nose wheel is on the centerline and tracking straight, > >> the main wheels are not equidistant from the centerline. It looks like > >> the thing is crabbing. What's the deal with that? Anybody? Jim Messina <email@example.com> wrote: >>Easy one. They are taxiing out with only one engine running to save fuel. >>It does put side loads of the nosehweel with the engine out on the wing >>but seems to be standard practice when the aircraft is light and delays at >>the runway are expected(you're number 5 for takeoff). > >>When the aircraft is heavy, single engine taxi out is difficult and >>possibly hazardous to ground personell or structures because of the large >>breakaway thrust needed. On 25 Sep 1996, Jos Gielen wrote: > ALL 737's do it, also the ones I know off that don't taxi single > engine. On a a twin engine jet that is stupid by the way, unless your > pretty light and looking at long delays on the taxitrack, and don't > have to move too much. That's what I said but is hardly stupid to many operators who use this method quite routinely. It is one reason why a 737 looks crooked while taxiing. > As for the "crooked" taxiing, the rudder of the 737 is oversized, and > makes it hard to taxi in a crosswind. That could be one reason. I must > say however that I've also seen them do it on a windless day. The > nosewheel is not off-centerline btw. There is, in the knee-joint on both main landing gears, a dowel that has some lateral freedom of movement. The main wheels do shift a few degrees either side of center. I wouldn't call it a "cross wind landing gear", because no one I know allows the airplane to land in a crab to take advantage of this small freedom of movement.