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Via YouTube. And here's one with an Airbus A380. How do they keep the airplane angled like that as they approach the runway? Or do they make an approach into the wind, crosswise to the runway, and then a quick turn when the wheels touch down?
I once flew to Hong Kong beside a wicked handsome pilot who told me every landing is like a controlled skid . . .
#1
Sissy Willis
(Link)
on
2007-05-09 18:29
(Reply)
You simply point the nose of the plane into the wind. The wind pushes you sideways, so if you balance the sideways push of the wind with the direction you're pointing into the wind, you go in a straight line, lined up with the runway the whole time.
But I don't like landing in a crab, but I guess the slip (I'll describe an aviation "slip" in a minute) is too scary looking for heavys. (It might even bee that the stresses of a slip landing are too much--AE I am not.
The pictures sho a crab--wings level, nose pointed into the wind.
In a light aircraft the wheels don't "dolly" so you have to kick the crab out (bring the nose around in front) just as you touch down.
In a slip you drop the up-wind wing (as if turning into the wind) then use the rudder to keep the nose pointed the way you are going. In normal flight configurations this is called a slip (other words that will come up are "crossed controls", and "unco-ordinated" which are Bad Things).
(Controls crossed the other way is a skid. The crab is neither.)
I have not been in the front office of an airplane in a lot of years, I hope I have not remembered the terms backward.
#3
Laurence F. Sheldon, Jr.
on
2007-05-09 19:02
(Reply)
I haven't been in the front office in a while myself, but I do believe you are correct LS. I always preferred the 'slip' over the 'crab'. But I never flew anything but, 'light' aircraft.
One possible issue with the 'heavies' using the slip may be the length of the wings. They would have to go wings level quite high, still susceptible to the crosswind, to avoid putting a wingtip into the ground. Maybe someone can correct me or proffer the 'real' reason.
It occurs to me that the probable reason for not using side-slips on crosswind approaches is this:
In the crab "down" feels pretty much where the revenue pax expect it to be, some where under their butts.
In the side slip, "down" feels like it is out the side of the aircraft, which makes people who don't understand it all really nervous--and since they are not outside, they don't know that they are flying sideways.
Those videos are pretty awesome, by the way.
#6
Laurence F. Sheldon, Jr.
on
2007-05-09 22:17
(Reply)
I would think that landing a heavy, while slipping, would bring the plane down on mainly one set of gear. Probably the engineers would squeak about that.
But that is where my engineering fails because while it seems like the whole weight would be on the upwind gear, it also seems like the downwind wing would still be flying and carrying its share of the load.
And all of that seems like that would be less than the side-load on the gear, but maybe the computer does a perfect job or presetting the gear for the direction of travel.
Turns out that there is more that I don't know than there is that I do.
#7.1
Laurence F. Sheldon, Jr.
on
2007-05-10 17:13
(Reply)