Takeoff without flaps?

[Irfan]

Takeoff with 5 deg flaps?
[photoid=5655683]

[RingwaySam]

Takeoff with 5 deg flaps?
[photoid=5655683]

They always rocket out the BA 757's so I guess there wasn't many passengers or fuel on-board.

[G-DALE]

Flap 5" is the standard flap setting on takeoff for the B757.

Dale

[Irfan]

I tought it was the normal 15 deg flap setting? Thanks Dale.

[G-DALE]

Flap 15" as far as I can remember is the flap setting for takeoff on the B777, but only 5" is required on the B737, B757, B767 and so on.

Dale

[Crism]

737's use either 1, 2, or 5 according to a Southwest pilot I talked to :)

[G-DALE]

Yeah, it obviously depends on weight, runway length, wind speed etc, but it's generally 5".

[ACman]

Well the F70 and F100's can do flapsless t/o along with the A300. As for the A300, its the slats that are extended.

[Irfan]

Wow, in FS i do 15 deg flap settings in FS. But i saw some B757's and B767's that use 15?


(Thnaks to the moderator that changed my username! :D )

[screaming_emu]

Well the F70 and F100's can do flapsless t/o along with the A300. As for the A300, its the slats that are extended.

As has been stated a billion times before, any aircraft can take off without flaps. The only things that prevent this is runway length, pitch angle required for takeoff, and max tire speeds.

The reason large aircraft use flaps on takeoff is because with flaps extended, the wing will create more lift at a given airspeed. This allows them to leave the ground at a lower airspeed. This decreases the amount of runway needed because it takes less distance to accelerate to that speed.

The reason they dont take off with full flaps is because when you extend flaps, you get both an increase in your coeficient lift and an increase in drag. In the first couple flap settings, you are mostly getting an increase in lift with just a tiny bit of drag, but as you extend them further, you get less of a lift increase and more drag. If they extended the flaps too much, it would make it so the aircraft could fly at a slower airspeed, but because of the large increase in drag, it would take forever to get to that speed.

[G-DALE]

The reason they dont take off with full flaps is because when you extend flaps, you get both an increase in your coeficient lift and an increase in drag. In the first couple flap settings, you are mostly getting an increase in lift with just a tiny bit of drag, but as you extend them further, you get less of a lift increase and more drag. If they extended the flaps too much, it would make it so the aircraft could fly at a slower airspeed, but because of the large increase in drag, it would take forever to get to that speed.
Yup, it's "swings and roundabouts...."

[bbuse]

Yeah, it obviously depends on weight, runway length, wind speed etc, but it's generally 5".
It also depends on the combination of altitude and temperature (density altitude).

The only commercial plane I have been on that does takeoffs without flaps is the SAAB 340. I was very surprise to see the flaps retracted on my first takeoff on the 340, but this has been common on every 340 flight I have been on.

[G-DALE]

It also depends on the combination of altitude and temperature (density altitude).
Hence why I put "etc" on the end there ;) But yeah, the air temperature and humidity also play an important role in calculation V-speeds and flap settings.

[Myriad]

It also depends on the combination of altitude and temperature (density altitude).

The only commercial plane I have been on that does takeoffs without flaps is the SAAB 340. I was very surprise to see the flaps retracted on my first takeoff on the 340, but this has been common on every 340 flight I have been on.
I doubt that you saw an A340 do a 0 flap takeoff... it might have performed a 1 flap takeoff (Leading Edge Slats). The A340 is severly underpowered and even with more flap will take a while to reach v1.

[Leftseat86]

I doubt that you saw an A340 do a 0 flap takeoff... it might have performed a 1 flap takeoff (Leading Edge Slats). The A340 is severly underpowered and even with more flap will take a while to reach v1.

Do you ride the short bus to school?

[Kevin]

I geuss the A340 is not very much under power, it is just the wing design and the angle of the wings attached (inclined) to the fuselage is greater than some other aircrafts (compare with Boeing if you like).

Well, for a normal operating weight, a take off without flap is not possible for most heavy airliners...flaps play an important role in a flight.

[CPH Aviation]

[photoid=552870]

Lufthansa A300 doing a 0 flaps takeoff......

Soren

[ACman]

0 flaps but 5 slats.

[avro_arrow_25206]

I doubt that you saw an A340 do a 0 flap takeoff... it might have performed a 1 flap takeoff (Leading Edge Slats). The A340 is severly underpowered and even with more flap will take a while to reach v1.
He was referring to SAAB 340, not Airbus ;)

[ExpressJet145]

Straight from a 757 pilot I know... flaps 5 if the runway is long enough and they arent that heavy. Flaps 15 if the runway proves to be a challenge. Hope that helps.

[pbateson]

A310 can do 0 flap.

[pbateson]

http://flightlevel350.com/viewer.php?id=4376

[ACman]

The A300 and A210 can do "zero flap" take-off's but they use 5 slats.