Boeing 747-8 |
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CaptCosslett 
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Joined: 20 Feb 2009 Location: Bishop Auckland Points: 1185 |
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 Posted: 05 Jan 2010 at 8:52am |
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It is called raked wingtips
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CyprusAirwaysA330
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Joined: 02 Apr 2008 Location: London Points: 1829 |
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Posted: 05 Jan 2010 at 8:33pm |
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The 77W, 77L and 77F also have them, as well as the A350.
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johnsmithfsx
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Joined: 29 May 2008 Location: United States Points: 3391 |
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Posted: 05 Jan 2010 at 9:52pm |
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Ah. What do they do for aerodynamics and performance?
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CyprusAirwaysA330
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Posted: 05 Jan 2010 at 10:31pm |
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Reduce fuel burn. I don't know if they affect handling much, I would guess not really.
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CaptCosslett
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Joined: 20 Feb 2009 Location: Bishop Auckland Points: 1185 |
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Posted: 10 Jan 2010 at 5:32pm |
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Well it looks like I was wrong, thought there was a good chance of the 747-8 flying today.
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FSaddict
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Joined: 02 Apr 2008 Points: 1067 |
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Posted: 10 Jan 2010 at 6:51pm |
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...in photoshop  |
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CaptCosslett
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Joined: 20 Feb 2009 Location: Bishop Auckland Points: 1185 |
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Posted: 19 Jan 2010 at 9:00pm |
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The latest on the 747-8 program, not much news onthe first flight though.
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VulcanB2
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Joined: 02 Apr 2008 Points: 13365 |
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Posted: 19 Jan 2010 at 10:41pm |
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Winglets can have a dramatic effect on handling, especially at low speed. On the Fokker 50 they make the difference between having roll control and not having roll control! Without them the ailerons stall.
Best regards, Vulcan. |
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CyprusAirwaysA330
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Posted: 20 Jan 2010 at 9:57pm |
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Very interesting Vulcan, I've flown many times on the Fokker, yet never noticed they have winglets.
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Hot_Charlie
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Posted: 20 Jan 2010 at 10:34pm |
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That's not strictly true, as the basic wing of the Fokker 50 is that of the Fokker 27, which didn't have the upturned wingtips. I suspect it does have certain efficiency benefits for a fairly basic inefficient straight wing design though. |
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VulcanB2
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Posted: 21 Jan 2010 at 3:00pm |
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My info comes directly from guys who flew it. Without the winglets, the aircraft is uncontrollable in roll at low speed. The wing is *based* on the F-27, yes, but it is quite different. Best regards, Vulcan. |
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CaptCosslett
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Joined: 20 Feb 2009 Location: Bishop Auckland Points: 1185 |
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Posted: 21 Jan 2010 at 8:47pm |
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How do I answer this ?
Firstly ailerons do not stall, it that part of the wing that stalls(forward of the ailerons). If you have a look at the wing design on light aircraft(Post 1940's), the angle of incidence is greater inboard of the wing. Therefore the inboard part of the wing stalls first, but the outer part of the wing is still flying, giving aileron control as the angle of incidence is less. Also known as washout, sorry have I not explained in detail. Will find a link to explain fully.
James
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CaptCosslett
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Posted: 21 Jan 2010 at 8:54pm |
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Here is a good link,
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CaptCosslett
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Posted: 23 Jan 2010 at 9:10pm |
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Buy your front tickets now to see the 747-8 first flight. Must be be close now.
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Hot_Charlie
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Posted: 23 Jan 2010 at 10:20pm |
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Not convinced at all. For a start it wouldn't get certified. They'll improve the handling yes, but to be uncontrollable? They really must've been using a figure of speech as opposed to talking literally. As for the wing, from what I can gather, aerodynamically it is identical other than the mounting for the (different) engines, and the endplates. |
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johnsmithfsx
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Posted: 23 Jan 2010 at 11:12pm |
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Hahaha! I love how simple they made things  very informative |
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CaptCosslett wrote: