Aborted BA Concorde T/O today?
Join Date: Mar 2000
Location: UK
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And while we are all in the classroom, let's answer the next question before it's asked!:
Why always full power? Other a/c are almost invariably using derates/graduations off a 10000' sea-level runway.
At normal weights Vmd (and best L/D) are in excess of 400kts IAS after take off - you are a LONG way the wrong side down the drag curve (John F will be able to speak as authoritatively as any on this subject), therefore the faster the speed you attain on the runway the better the performance after lift-off.
Thus,max power take off ensures LOWER fuel burn for the sector and LESS noise after take off due greater overflight altitude achieved.
For those with Perf A:
Obviously off a short runway, Vr will be lower. The weird thing is that, because you are so far below Vimd/best L/D you are more likely to be WAT limited.Off a long runway the tyre speed is the limit and WAT isn't a factor til you are at a very high density alt. It's not really an aeroplane until it's accelerating through 350kts, then you get largely back to the rules you learnt for your licence!
Why always full power? Other a/c are almost invariably using derates/graduations off a 10000' sea-level runway.
At normal weights Vmd (and best L/D) are in excess of 400kts IAS after take off - you are a LONG way the wrong side down the drag curve (John F will be able to speak as authoritatively as any on this subject), therefore the faster the speed you attain on the runway the better the performance after lift-off.
Thus,max power take off ensures LOWER fuel burn for the sector and LESS noise after take off due greater overflight altitude achieved.
For those with Perf A:
Obviously off a short runway, Vr will be lower. The weird thing is that, because you are so far below Vimd/best L/D you are more likely to be WAT limited.Off a long runway the tyre speed is the limit and WAT isn't a factor til you are at a very high density alt. It's not really an aeroplane until it's accelerating through 350kts, then you get largely back to the rules you learnt for your licence!
