Blast From Sweden, joined Nov 2005, 119 posts, RR: 1 Posted (5 months 3 weeks 2 days 23 hours ago) and read 22874 times:
On Tuesday I happened to watch Emirates' daily A380 service to DBX use little runway at AMS and take off like a rocket, before banking and leveling off a bit. Does anyone know anything about load factors on this route? I know it is a 6:30 hour flight to DBX so it won't need a full fuel load, but that could be compensated with more pax and freight..
(Searched for info in this forum, apologies if this has been dealt with earlier).
Taking the 6 hour & 30 minutes flight time into account plus the fact an A380 requires 20% less runway than say a B744 I wouldn't be surprised these are the reasons for a quick rotation...
9MMPQ From Netherlands, joined Nov 2011, 243 posts, RR: 0 Reply 4, posted (5 months 3 weeks 2 days 12 hours ago) and read 17803 times:
No idea on loadfactors but some days you see it get off the runway quickly & on other days you don't. For example, last Tuesday they seemed to use much more runway. I don't really think you can determine a lot based on it though, it's a relatively short route with 6 hours 30 minutes.
Quoting sturmovik (Reply 3): Could it be due to noise abatement procedures? Just curious..
Definitely no noise abatement procedures which require one to be airborne already halfway down the runway.
[Edited 2012-11-29 01:19:58]
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76er From Netherlands, joined Mar 2007, 410 posts, RR: 1 Reply 5, posted (5 months 3 weeks 2 days 12 hours ago) and read 17594 times:
No.
Normal procedure at AMS is the NADP1 for all aircraft. Meaning takoff thrust (full or derated) until 1500ft, followed by climb thrust. Speed between approx V2+10 up to V2+25 till 3000ft, then accelleration to 250kts or higher as dictated by either local regulations or aircraft performance.
Most aircraft will takeoff with the maximum allowable thrust reduction on takeoff, for reduced engine wear. For mechanical or weather reasons it may happen that full thrust is required for takeoff, which may be an explanation for the very short takeoff roll and steep initial climb.
777way From Pakistan, joined Dec 2005, 5179 posts, RR: 4 Reply 6, posted (5 months 3 weeks 2 days 8 hours ago) and read 13812 times:
Somewhat related why are some takes offs at a slow speed almost like a cruise while others are like a rocket, for example in a place like Karachi where there are no enviromental laws, sometimes airliners are flying out like at fighter jets speed while usually its a normal rate, whats the reason behind this?
As for sound I have seen PIA 777s fly out so silently after take off that if they hadnt caught your eye you wouldnt know they were around and this is like maybe two minutes after take off, what causes the engines to not make any sounds?
brilondon From Canada, joined Aug 2005, 3170 posts, RR: 1 Reply 7, posted (5 months 3 weeks 2 days 8 hours ago) and read 13079 times:
What was the weather like on the days you are comparing this to? The weather plays a large part in how long a take off run is needed. The head winds, the temperature, the humidity and event the barometric pressure can have an effect on the aircraft's runway length.
migair54 From Spain, joined Jun 2007, 1277 posts, RR: 0 Reply 8, posted (5 months 3 weeks 2 days 6 hours ago) and read 10379 times:
Quoting 777way (Reply 6): As for sound I have seen PIA 777s fly out so silently after take off that if they hadnt caught your eye you wouldnt know they were around and this is like maybe two minutes after take off, what causes the engines to not make any sounds?
Wind, the wind can take away the noise from your position.
Also Wind can also reduce the Ground Speed and the climb gradient, so less forward speed and more vertical speed, so you say that they use the little runways that could indicate a strong wind for departure and thus the selection of the little runway.
AmericanAirFan From United States of America, joined Jun 2004, 397 posts, RR: 3 Reply 9, posted (5 months 3 weeks 2 days 3 hours ago) and read 6627 times:
Wind can have a big impact. Weight can also have a large impact. When I've been spotting at LAX, I had planes all rotate and climbing out in relatively the same spots compared to the control tower all day. I had some photos of a 757 that got off with very little runway and climbed out like a rocket clearly flying high above the control tower from my vantage point. My guess is that it was light, but in your situation it could have also been wind.
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Blast From Sweden, joined Nov 2005, 119 posts, RR: 1 Reply 11, posted (5 months 3 weeks 2 days 2 hours ago) and read 5169 times:
Quoting 76er (Reply 5): Normal procedure at AMS is the NADP1 for all aircraft. Meaning takoff thrust (full or derated) until 1500ft, followed by climb thrust. Speed between approx V2+10 up to V2+25 till 3000ft, then accelleration to 250kts or higher as dictated by either local regulations or aircraft performance.
Most aircraft will takeoff with the maximum allowable thrust reduction on takeoff, for reduced engine wear. For mechanical or weather reasons it may happen that full thrust is required for takeoff, which may be an explanation for the very short takeoff roll and steep initial climb.
Thx 76er and the others, that's interesting info.
Quoting brilondon (Reply 7): The weather plays a large part in how long a take off run is needed. The head winds, the temperature, the humidity and event the barometric pressure can have an effect on the aircraft's runway length.
Weather-wise it wasn't a special day. There was little wind (south south east) and the temperature would have been in between 6 en 8 degrees C. Obviously that is dense winter air. Humidity was 91% and barometric pressure was 1003hPa (14.55 psi) Plane took off from the Kaagbaan (runway 24) btw.
Quoting EK413 (Reply 1): an A380 requires 20% less runway than say a B744
The EK A380 is the only A380 we have at AMS, so it's kinda difficult to compare.
I flew AMS DXB AMS in november 2010 on EK but back then they operated their 777s, which in my case were about 80 % filled.
mffoda From United States of America, joined Apr 2010, 908 posts, RR: 0 Reply 12, posted (5 months 3 weeks 1 day 21 hours ago) and read 1551 times:
I personally believe the OP's experience has more to do with the sheer size of these large aircraft. As someone who has been close (like just off the runway) to many of these take-offs it seems almost unreal that they get in the air that quickly.
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