Duration of take off. How long generally?

[Simpo Two]

jonnyb said:

She has way too much free time!

The more efficient you are the more free time you have!

[CAPP0]

As a fairly frequent flyer (c.20 return flights p.a.) I have noticed over the past 12 months or so that the takeoff roll is often much longer than it used to be; certainly enough of a difference for me to notice. This is mostly all on smaller aircraft (A319/A320 types) and within Europe. Curious as to whether anything has changed to drive this?

[Ginetta G15 Girl]

r1flyguy1 said:

And way to technical for people who have little aviation technical background/knowledge.

Just to correct 1 point she makes....


V1 is not a decision speed,.......

For all intents & purpose, if you reach V1 there is no decision to be made you only have 1 option & to me, that's NOT a Decision

That's fair enough but we are splitting hairs.

Below V1, loose a donk and you stop. Above V1, loose a donk and you go.

Ergo V1 is a decision speed (Note: the decision has already been made whether to stop or go).

[CrutyRammers]

MattS3 said:

Some really informative replies here, thanks folks.

I think I'm right in thinking that if things are not going to plan by a certain time, the plane can still be brought to a safe stop so long as the wheels are still on the ground then......
Thus, my fear of running out of runway is not one to be awfully concerned about as the decision to abort will be taken prior to the wheels leaving the black stuff.

However, once off the ground, if there is an issue, even at 5 feet, the outcome could be much different.....

As long as you're not flying with this guy: https://www.youtube.com/watch?v=ZmEVwyMRYIY

I have to say that seeing that Thompson birdstrike video some time ago made me much happier about takeoffs!

[anonymous-user]

CrutyRammers said:

MattS3 said:

Some really informative replies here, thanks folks.

I think I'm right in thinking that if things are not going to plan by a certain time, the plane can still be brought to a safe stop so long as the wheels are still on the ground then......
Thus, my fear of running out of runway is not one to be awfully concerned about as the decision to abort will be taken prior to the wheels leaving the black stuff.

However, once off the ground, if there is an issue, even at 5 feet, the outcome could be much different.....

As long as you're not flying with this guy: https://www.youtube.com/watch?v=ZmEVwyMRYIY

I have to say that seeing that Thompson birdstrike video some time ago made me much happier about takeoffs!

I suggest his take off calculations didn't take in to account any obstacle data.

[r1flyguy1]

Ginetta G15 Girl said:

r1flyguy1 said:

And way to technical for people who have little aviation technical background/knowledge.

Just to correct 1 point she makes....


V1 is not a decision speed,.......

For all intents & purpose, if you reach V1 there is no decision to be made you only have 1 option & to me, that's NOT a Decision

That's fair enough but we are splitting hairs.

Below V1, loose a donk and you stop. Above V1, loose a donk and you go.

Ergo V1 is a decision speed (Note: the decision has already been made whether to stop or go).

That's fair enough, now your stating the obvious!

[mrloudly]

This guy could have done with a bit more strip or a bit less load!!!

http://www.youtube.com/watch?v=i9DFUqbdH_0

[jonnyb]

r1flyguy1 said:

Ginetta G15 Girl said:

r1flyguy1 said:

And way to technical for people who have little aviation technical background/knowledge.

Just to correct 1 point she makes....


V1 is not a decision speed,.......

For all intents & purpose, if you reach V1 there is no decision to be made you only have 1 option & to me, that's NOT a Decision

That's fair enough but we are splitting hairs.

Below V1, loose a donk and you stop. Above V1, loose a donk and you go.

Ergo V1 is a decision speed (Note: the decision has already been made whether to stop or go).

That's fair enough, now your stating the obvious!

Just to be accurate, two stopping actions have to have been enacted by V1 for you to stop. So you will get the engine failure before V1 and still go. Up to 2 seconds before V1 to be ultra accurate.

But none of this answers the OPs question. Which has a lot more to do with runway length, atmospheric factors and obstacle clearance. This leads to the choice of V1/VR/V2, and the thrust to be used. Which in turn dictates the take off run of the aircraft.

[PRTVR]

jonnyb said:

r1flyguy1 said:

Ginetta G15 Girl said:

r1flyguy1 said:

And way to technical for people who have little aviation technical background/knowledge.

Just to correct 1 point she makes....


V1 is not a decision speed,.......

For all intents & purpose, if you reach V1 there is no decision to be made you only have 1 option & to me, that's NOT a Decision

That's fair enough but we are splitting hairs.

Below V1, loose a donk and you stop. Above V1, loose a donk and you go.

Ergo V1 is a decision speed (Note: the decision has already been made whether to stop or go).

That's fair enough, now your stating the obvious!

Just to be accurate, two stopping actions have to have been enacted by V1 for you to stop. So you will get the engine failure before V1 and still go. Up to 2 seconds before V1 to be ultra accurate.

But none of this answers the OPs question. Which has a lot more to do with runway length, atmospheric factors and obstacle clearance. This leads to the choice of V1/VR/V2, and the thrust to be used. Which in turn dictates the take off run of the aircraft.

You forgot steam puddings or as it is commonly known aircraft weight.

[anonymous-user]

http://youtu.be/d7q3j69-SHM

Perf A?!

[Mojocvh]

Getting back to the OP!

They use rated takeoffs where the engines are set to a performance "stop" calculated from "loads of stuff" mainly to get the maximum use of the engines before they have to go for overhaul..

[Mojocvh]

mat13 said:

Carcassone isnt a nice place to take off or land in my (limited) experience, possibly because it has a short runway.

never had any problems when a pax there apart from the bloody bumpy runway...

[Chuck328]

Terrain around can make for a longer run. Lisbon and Madrid are good examples. Long runways with hills about have seen me doing 185mph down a runway to get some extra 'throw' into the air and improved climb performance.

Lisbon is bloody awful at that speed, I do wonder how much abuse those tyres can take.

[mybrainhurts]

MattS3 said:

The only part of flying which makes me anxious is that period between gaining speed and then take off

You don't need to worry about that.

It's sustaining power on the climb out you need to worry about.

HTH....

[r1flyguy1]

Mojocvh said:

Getting back to the OP!

They use rated takeoffs where the engines are set to a performance "stop" calculated from "loads of stuff" mainly to get the maximum use of the engines before they have to go for overhaul..

They do indeed.... But not always...

Certain weather conditions prohibits the use of derate thrust thus full power is used.

[brickwall]

If I remember correctly, then a fairly laden flight on non-derated take-off, rough times are:
- A320/737: ~30 secs
- 747: ~45 secs

If it's a de-rated takeoff you'll know about it because the engines make a different noise (lower rpm) and the kick in the back isn't as strong

[WinstonWolf]

Tristars, them buggers always seem to be in the weeds at the end of the runway before they get into the air...

[GuinnessMK]

I got on a 747 going on a non stop from Joburg to Amsterdam. Again, every seat full, a hold full of carved wooden animals, hot afternoon and Joburg is at a decent altitude. I really thought the pilot was going to drive the plane back at full pelt, rather than attempt to get it airbourne.

[Mabbs9]

The longest I've timed was 55 secs, we were within a few kilos of MTOW, from SIN to LHR, we put on just over 160t of fuel, hot night with little wind. I think the planned flt time was about 13.10.

[MitchT]

777 fully loaded from JFK to LHR ... felt like they were going to drive there rather than fly.
737 with 10 PAX from LBA to DUS ... felt like an aircraft carrier take off looks!