Iainhol From , joined Dec 1969, posts, RR: Reply 1, posted (12 years 6 months 2 weeks 1 day 3 hours ago) and read 1822 times:
They did flight test to see the difference performance, one source told me they make no difference but another one told me only the really long haul they help a little. That is why on the D models they do not have any!
Iainhol From , joined Dec 1969, posts, RR: Reply 2, posted (12 years 6 months 2 weeks 1 day 3 hours ago) and read 1774 times:
After reviewing both photo's it is only missing one winglet, I doubt that one winglet makes much different. BA or some one else lost one a while ago! Maybe it got banged in the hanger so it was easier to take it off!
Yaki1 From , joined Dec 1969, posts, RR: Reply 3, posted (12 years 6 months 2 weeks 1 day 3 hours ago) and read 1753 times:
Could have been damaged and is removed per a dispatch deviation guide or configuration deviation guide. Each airline has its own rules and policies which are FAA approved. Or it could be on a special ferry permit under part 91 ( not carrying paxs )
CPDC10-30 From United Kingdom, joined Feb 2000, 4759 posts, RR: 26 Reply 4, posted (12 years 6 months 2 weeks 1 day 3 hours ago) and read 1742 times:
I remember reading about a year ago here that it was done as an experiment by United...no more and no less. They found practically no difference with or without the winglet. Remember, the 747-400SR (or Domestic) doesn't have winglets either.
Big777jet From , joined Dec 1969, posts, RR: Reply 5, posted (12 years 6 months 2 weeks 1 day 2 hours ago) and read 1714 times:
I hope not to hear what if passenger is on board. If he looks out window left side wing is flat and walk around to look at right wing it came with winglet. He would be SCREAMING!!! what do you think? haha I think it is not missing winglet by now. Probably, it back on it both winglet. It is rarely to see this plane one with and one without . Strange looking huh?
Red Panda From Hong Kong, joined Jun 2000, 1521 posts, RR: 0 Reply 11, posted (12 years 6 months 2 weeks 16 hours ago) and read 1581 times:
Are you sure that CX operate A34 w/o the center gear? Sometimes it's very easy to miss the center gear if you look from the bottom of an a/c. Anyhow, the center gear on A40 is just for auxilary when landing. I believe it can land w/o the center gear too. But I've never seen any a/c w/ only one winglet on!!!! Thanks for all the great photos.
Mason From United States of America, joined Jun 1999, 747 posts, RR: 1 Reply 15, posted (12 years 6 months 2 weeks 15 hours ago) and read 1532 times:
In regards to the issue of whether or not winglets help on long-haul flights, please view the numerous threads in this forum. They do help, but only on longer flights, which is why the 747-400D does not have them. They actually produce a slight amount of thrust, netting an increased range due to fuel savings.
LH423 From Canada, joined Jul 1999, 6501 posts, RR: 55 Reply 16, posted (12 years 6 months 2 weeks 14 hours ago) and read 1513 times:
The centre bogey on certain airplanes, like the A340, MD-11, and 747, are to more evenly distribute weight over the the taxiway/runway.
The heavier the plane, the more weight is concetrated on certain points, so to prevent the aprons, and taxiways from cracking under the immense pressure is to add more bogies, ie more wheels, to distribute the weight.
Think about some of those idiots that make a living by laying down on nails. They can lay down on nails because their body weight is distributed over hundreds, if not thousands of nails, therefore each nail holds enough weight as to not puncture the skin. Compare that to sitting on a tack...ouch. All your boby weight is centred on one (very sharp) point.
However not all planes use centre bogies to distribute weight: Case in point, the Antonov An-124.