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April 6th, 2006, 20:40
| #1 |
| Junior Member  Join Date: Nov 2005
Posts: 76
|  Slow 747 I was watching this video: http://www.flightlevel350.com/video_...ng.php?id=5801 and noticed a couple of things. This is the newest version of the 747 family, the 400. Why does it seem like this plane can't get up in the air as fast as others? It seems like it stays on the same altitude for such a long time. In addition to this the flaps are left on for a lot longer than other aircraft. Why do the flaps go up in a certain sequence? |
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April 6th, 2006, 22:48
| #2 |
| Old Skool  Join Date: Apr 2003 Location: Atlanta
Posts: 2,205
| Think about this. The flight is going from Frankfurt to Hong Kong. I am sure he is carrying over 200,000 lbs of fuel plus cargo. A true to meaning to heavy
__________________ Once you have tasted flight, you will forever walk the earth with your eyes turn skyward, for there you have been, and there you will always long to return.----- Leonardo Da Vinci |
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April 6th, 2006, 23:03
| #3 |
| Junior Member Join Date: Nov 2005
Posts: 76
| OH for sure. Nevertheless, a 777, which doesn't weigh as much, can be doing the same route and and gain altitude much quicker. I am not sure...maybe I am wrong |
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April 6th, 2006, 23:14
| #4 | |
| Junior Member  Join Date: Apr 2005 Location: Phoenix
Posts: 99
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April 6th, 2006, 23:18
| #5 |
| Old Skool  Join Date: Feb 2002 Location: Park City, UT
Posts: 12,322
  | This has airliners.net written all over it
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April 6th, 2006, 23:37
| #6 | |
| Junior Member  Join Date: Mar 2004 Location: COS
Posts: 269
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__________________ You can count on me to always be two beats behind every conversation! Superman owns a pair of B767 pajamas "Well, they built the 2006 Dodge Caravan to replace the 2005 and earlier Dodge Caravans, but they're still on the road..." - DT | |
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April 6th, 2006, 23:43
| #7 | ||
| Old Skool  Join Date: Jun 2002 Location: Fort Lauderdale
Posts: 2,825
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__________________ Secret line of text. What you resist, persists. - Carl Jung Quote:
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April 7th, 2006, 00:42
| #8 |
| Old Skool  Join Date: Sep 2001
Posts: 2,044
| Actually, it is true that a 777 (or any other twin) will reach cruising altitude a lot faster than a quad or tri jet. The reason is based on engine out performance requirements. Twins do very well -- as long as everything is working.... 747 on that route will burn a lot more than 200k, takeoff fuel would have to be around 350k with reserve fuel. Burn rate is around 25k/hr. |
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April 7th, 2006, 01:02
| #9 |
| Old Skool  Join Date: Oct 2005 Location: ROC
Posts: 2,211
| I think alot of times a 74 looks like its crawling just becasue of its size, its just your brain playing tricks on you.
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April 7th, 2006, 01:16
| #10 | |
| Old Skool  Join Date: Nov 2003 Location: KPHX, KFFZ, KIWA
Posts: 18,896
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April 7th, 2006, 01:30
| #11 |
| Senior Member  Join Date: Dec 2003 Location: Where everybody's somebody
Posts: 605
| There are different phases of flap retraction also.... 20.... 10.... i believe theres a flaps 5.. flaps 1... and up. Notice how the outboard krueger flaps come up before the inboards... also clean speed once the last of the flaps come up is around 280 knots.
__________________ TROGDOR THE BURNINATOR |
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April 7th, 2006, 01:39
| #12 |
| Old Skool Join Date: Sep 2001
Posts: 2,044
| As I recall, their clean max weight speed was more like 270kts. The clean speed on an MD11 is 289kts at max weight. |
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April 7th, 2006, 08:24
| #13 | |
| Old Skool  Join Date: Mar 2004 Location: Georgia
Posts: 3,389
| Quote:
747s are designed to lift as much as possible from long runways and carry it long distances. So they typically struggle early in the flight and their initial cruise altitude is usually limited until fuel is burned off. The 777, even heavily loaded, will perform better.
__________________ Whether you think you can or think you can't, you're right. — Henry Ford | |
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April 7th, 2006, 09:54
| #14 |
| Junior Member Join Date: Nov 2005
Posts: 76
| I thank everyone who has ACTUALLY given me a reply in reference to the question.For those of you who made comments that were based on...well...nothing but you simple immaturiy; I simply come here to post questions because I believe that the people here are very knowlegeable and I know they will answer my question. I am interested in aviation and have loved it since I was little. I am not a mechanic, pilot, or anything related to the engineering of aircrafts so asking a question, like the one I asked, is in my nature to learn. Once again thank you to everyone that has been so nice.Oh, and the airliners.net comments was not necessary. I do visit airliners.net but 1. do not have the funds to acquire a membership there to post, and 2. really wouldn't ask some people there knowing they know very little at times. |
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