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Crosswind Landings; A Question......  
User currently offlineGeezer From United States of America, joined Aug 2010, 1479 posts, RR: 2
Posted (3 years 3 months 4 days 19 hours ago) and read 2414 times:

I was just looking at Randall Johnson's great shot of a DL 757 landing at Vegas in 40 mph X-wind; ( Today's "Photographer's Choice" ), looks like the right main tires are maybe 18 to 24 inches above the runway, while the left wing ( what you can see of it, due to narrow photo ) is about level with the runway / ground; this all got me to thinking.......

Probably around '94 to '97, I was coming down the N.J. Turnpike, southbound, and was watching the airliners that were on short final into Newark; it was obvious there was a lot of wind. As I was going to Pt. Newark. I had to take the exit at the north end of the airport; as I was paying the toll, I decided to pull over to the side and watch the planes for a while. As the exit / toll booths are only a few feet from the airport fence, and the threshold of the runway is quite close to the fence, it was a great place to watch the planes landing in the strong wind. All of them were being "tossed about" quite a bit, but then this one plane ( I think it may have been a B 737, but I'm not sure ) was just about to touch down, his "mains" were maybe only 2-3 feet from touching, when a sudden gust caught him from the left side, and his right wing tip appeared to almost strike the runway ! I don't know what the pilot did, but whatever it was must have been the "right" thing ! For an instant it looked as if the plane was going to touchdown at about a 45 deg to the runway, but then it made a sudden "correction", a hell of a puff of smoke when the right main tires touched before the left ones, and all of a sudden he was "down" and heading straight down the runway. Needless to say, the whole thing took about 1/50 the time it took me to type this !

So here's my question...........assuming the right main tires are touching, or just about to touch the concrete, and the right wing tip is less than 6 inches from touching, how far off the runway would the left side tires be ? I suppose it would vary greatly between different A/C types ?

I didn't see any sparks from the wing tip, ( but there wasn't much "daylight" between it and concrete either ), never heard anything on "the news", so I guess it was a "successful" landing ? ( Although I'll bet a lot of pax "smelled funny" when they "deplaned" ! ( Possibly even a Captain and FO ? )


Stupidity: Doing the same thing over and over and over again and expecting a different result; Albert Einstein
3 replies: All unread, jump to last
 
User currently offlineInnocuousFox From United States of America, joined Dec 2003, 2805 posts, RR: 14
Reply 1, posted (3 years 3 months 4 days 18 hours ago) and read 2326 times:

The last thing you do right as you touch down on a xwind landing is release all that "crab" that had you going sideways (so to speak) so that you are pointed down the runway instead. That's probably what that correction was that you saw.


Dave Mark - Intrinsic Algorithm - Reducing the world to mathematical equations!
User currently offlineB6JFKH81 From United States of America, joined Mar 2006, 2881 posts, RR: 7
Reply 2, posted (3 years 3 months 3 days 22 hours ago) and read 1818 times:

Quoting Geezer (Thread starter):
I suppose it would vary greatly between different A/C types ?

VERY much so (for the wings at least). For the wing, if 1 tip is only 6 inches off the ground with the main on that side ready to touch, you would have to figure out what angle the plane it at, the length of the wingspan along with how far off the ground the wing normally is. A CRJ2 (whose wings are low to the ground to begin with) in the situation you are considering will have their other wingtip only a few feet off the ground and a relatively small wingspan compared to an A380, whose wing tips are many feet off the ground to begin with and have huuuuuuuuuuuuuuuuge wingspans, so the other wing tip would be really high up in the air. It's basically a matter of geometry and ratios.



"If you do not learn from history, you are doomed to repeat it"
User currently offlineaklrno From United States of America, joined Dec 2010, 927 posts, RR: 0
Reply 3, posted (3 years 3 months 3 days 17 hours ago) and read 1646 times:

Quoting Geezer (Thread starter):
I didn't see any sparks from the wing tip, ( but there wasn't much "daylight" between it and concrete either ), never heard anything on "the news", so I guess it was a "successful" landing ? ( Although I'll bet a lot of pax "smelled funny" when they "deplaned" ! ( Possibly even a Captain and FO ? )

Get yourself a ticket to Reno and fly around here for a few days. You will see what it is like. My last arrival at RNO about 2 weeks ago we were being blown around so much (in a 737-700) it felt like an amusement park ride every time the pilot did a steep bank to get us back on course all the way down to about 100 feet. You could feel the wind catching the tail and trying to make the plane yaw.

We touched down on the right main, and a second later the left slammed down, followed by intense reverse thrust and brakes. I think the reversers and brakes were on before the nose gear was down. It pays to get below flying speed before the next gust. A normal day in Reno. I didn't notice any fuss among the locals. Funny thing is that I was talking to the pilots at PHX while we we waiting for the incoming flight to arrive and I asked him to make it interesting. He did.


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