What's the longest take-off run of a commercial flight?
score:12
Short:
I don't know the real world answer, but, based on the assumptions listed below, on a standard 10,000 foot international runway a fully laden A380 will begin to be in trouble at much over 1 minute and in deep trouble at about 70 seconds (eg removing the pieces of perimeter fence from the landing gear may be problematic).
The 45 seconds or so that I've experienced in a 747 felt "much too long".
If you wanted to do the longest possible run "just for fun" a craft with a very low takeoff velocity on a 12,000 foot runway could toddle into the air after more than 2 minutes of takeoff run, with room to spare.
I have experienced somewhere in the range of 60 to 100 airline takeoffs in the last 5 years (trips blur, I should make a record).
I roughly note the time taken for most but not all takeoffs.
I do not record the results but my impression is that they are typically longer on average now than they were 5 years ago. I'm told (no reference) that longer takeoff runs use less fuel. In my experience mid 20 second runs happen, high 20's to low 30s' are more usual. I have had one run which was well over 40 seconds - I was getting mildly concerned :-). I asked the pilot about it afterwards and he said it was not exceptional with a heavy load.
International runways are typically 10,000 feet long. Some are around 12,000 feet - but the added length is usually aimed at allowing very heavily loaded freight planes to land.
Assume
A 12,000 foot runway
Liftoff speed of 120 mph = 176 fps = 192 kph = 53 m/s
(which is about 66% of an A380's nominal takeoff speed of 78 m/s).All runway used
Constant acceleration from rest.
Mean velocity = Vtakeoff/2 = 176/2 = 88 fps.
Liftoff time is Length / Vmean = 12000 / 88 = 136 seconds = 2 minutes 16 seconds.
The same calculation with an A380 with liftoff at 78 m/s = 256 fps.
Mean V is now 128 fps.
Liftoff time is 12000/128 = 94 seconds.
Now try a 10,000 foot runway A380 etc.
10,000/128 = 78 seconds.
Allow a 10% "safety margin" (you crash slightly slower :-( ) and you get
9000/128 = 70 seconds.
Related:
14 CFR 23.59 - Takeoff distance and takeoff run.
FAA PART 23--AIRWORTHINESS STANDARDS: NORMAL, UTILITY, ACROBATIC, AND COMMUTER CATEGORY AIRPLANES
FAA definition{s} of takeoff distance
Wikipedia - Lonnnnnnnnnnnngest runways - at least 4000m / 13.123 feet !!!
Qamdo Bamda - 18,045 feet !!!
Q: Why???
A: Altitude = 14,219 feet.
Oh!Ramsnskoye - 17,723 feet
Q: Why?
A: Altitude 404 feet.
Q; Why ???
A: Once used for testing Buran Spaceplane.
Oh!
TORA, ASDA, TODA, LDA, SWY, CWY, D, ...
Image below is from link above -
Unrelated :-) - encountered along the way
VTOL blast platform design
Zero seconds liftoff run!
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