Questions tagged [takeoff]
Takeoff is the first phase of flight, when an aircraft lifts off from the runway or other surface.
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How do flights fly on some special days when there are firecrackers bursting near the source/destination airport? [duplicate]
I mean there might be festive nights like New Year eve, when there is spectacular display of colorful firecrackers in the sky, but when there are flights descending or ascending near a city with an ...
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2answers
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Airplane accidents that happen during take off and landing [closed]
I have just seen some documentary about Munich Air Disaster in 1958. I found that the real reason behind this disaster is related to the aircraft performance with the thick snow runway during take off....
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0answers
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How to calculate runway length required for an A380 to takeoff? [duplicate]
I was wondering, how much runway length does an Airbus A380 require to takeoff? I saw other answers on Aviation S.E. but I didn't find how to calculate it to (I am curious to know how to calculate it)....
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2answers
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Has there ever been a two engine Air Carrier where both engines failed during the takeoff run resulting in an accident?
Has there ever been a two engine Air Carrier anywhere that has had both engines fail at some point during the takeoff run that resulted in an accident?
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1answer
365 views
Why does Vr increase with lower air density and decrease with higher air density?
Can someone explain why Vr increase with lower air density and decrease with higher air density? I read such a phrase in my ATPL(A) performance textbook, but without further explanation. As far as I ...
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Why do pilots slowly give the plane more thrust during takeoff?
I have mostly seen pilots slowly pushing the throttle to toga during takeoff. But why? Why don't they just directly put the throttle to toga? Wouldn't that save runway length?
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1answer
120 views
How to calculate the takeoff speed for a hypothetical aircraft?
Given some basic information such as:
aircraft weight
wing load (including wingspan, and basically the whole wing configuration)
airfoil profile
coefficient of lift
angle of attack
Is it possible to ...
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1answer
190 views
Should a runway overrun be expected if takeoff is begun with one-engine-out?
Multi-engine aircraft have enough power to successfully takeoff if one engine fails after V1. But what if, on a runway equal to the specified takeoff distance, someone decided to roll with one engine ...
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2answers
147 views
How to do the land maneuver if I got complete thrust loss after liftoff with runway ahead?
I am flying a single engine aircraft and after liftoff in air at low height, I lost the engine but I till have some runway length ahead, what should I do? Land straight ahead? How could I tell if I ...
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2answers
166 views
How to fly a quick return to origin after takeoff
If I want the shortest traffic pattern to play touch and go or I got a emergency right after liftoff but the engine is still working, I just want to get back to ground as soon as possible, what is the ...
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635 views
How could I minimize the take off fuel consumption?
How could I minimize the aircraft total takeoff fuel consumption, taking into account all fuel used from start of take-off roll until reaching a safe altitude?
For example, if I fly with flap ...
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3answers
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Which flight maneuver is better for a takeoff emergency after liftoff, a tear drop (180° turn) or a 360° turn?
Let us say I got a time critical emergency right after the liftoff (like a fire, complete power loss) and I need do a return-to-runway and re-land maneuver. Which option is better, a 180-degree turn ...
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3answers
354 views
Does a wing produce an appreciable amount of lift during the takeoff roll prior to rotation?
I was hoping for some insight on this, perhaps also from pilots who have used AOA indicators. This because I assume that an AOA indicator is the only means to get at least an idea of how much lift is ...
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2answers
146 views
Is there any practical benefit of the Boeing-787 to perform near vertical takeoff?
In a promotional video for the Paris 2015 airshow, this video was released promoting the new Boeing 787's near vertical takeoff capability. Whilst highly impressive, I was wondering if there is any ...
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1answer
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Why does the Information Manual say "C172S - Flaps 10 (Preferred) for Normal Takeoff", when the models before S-model do not have this note?
Do Flaps 10 really do anything performance-wise other than reducing ground roll and distance over a 50-foot obstacle? If not worried about clearing an obstacle, does a Flaps UP-normal takeoff make ...
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1answer
514 views
What is "alternate takeoff" in this PT6A performance table?
I am flight mechanic, and I would like to know about this performance limitation:
What is the definition of alternate take off?
Why is the alternate take off temperature limit (ITT) lower than max. ...
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6answers
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Can flaps be used to perform rotation and flare?
TL; DR using flaps to directly control sink/climb rate near ground = simpler and faster response = easy to fly airplane?
Rotating is the pitch up during takeoff that causes the aircraft to leave the ...
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3answers
1k views
What effect does a direct crosswind have on takeoff performance?
Is the take-off distance increased by a direct crosswind?
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1answer
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What should be the thrust weight ratio for takeoff? [closed]
I am doing some calculations for preliminary design of an airplane and I was wondering how I would go about determining the minimum thrust to weight ratio needed for the aircraft to takeoff. Which ...
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1answer
514 views
What are the different types of take-off minima at the bottom of a Jeppesen airport diagram?
Anyone that could explain the bottom plate, what’s the difference between all those minima?
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1answer
3k views
Why is the DC-9-80 ("MD-80") prohibited from taking off with a flap setting between 13 and 15 degrees?
A bit of digging into the 7Z9363 accident investigation has brought up some interesting information regarding the DC-9-80 ("MD-80")'s flap system:
Flaps may be positioned in any of the six ...
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1answer
353 views
How big a risk is to abort take-off before V1 with uncontained engine fire and side-wind?
The Blue Panorama flight 1504 had uncontained engine fire just before V1 during take-off. The pilot continued the take-off and succesfully landed the plane with one engine. In the TEDx talk the pilot ...
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1answer
203 views
Is using a DERATE for Takeoff actually reducing the power of the engine?
When one chooses a DERATE for takeoff (TO-1 or TO-2 in the case of a B737), does the system actually reduce the available thrust of the engines, or is it computing a N1 that corresponds to the reduced ...
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3answers
176 views
Downwind Myth Question
I was reading a discussion about the "Downwind Myth" and a doubt arose:
If we are taking off with a 50knots headwind, that wind component will be part of our dynamic pressure, and so in that ...
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3answers
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Is there a crosswind that would perfectly cancel out the "torque" of a C172 on takeoff?
We all know that on takeoff you need right rudder in order to balance out the "torque" of the propwash hitting the tail. Is there an exact crosswind that would cancel out this torque?
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1answer
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Referring to the B737NG, at what point (height) does a TOGA revert to LVL CHG after the takeoff?
If one takes off with HDG SEL armed and no vertical mode (like VNAV) armed, at what height (AGL) will the vertical mode switch from TOGA to LVL CHG, and what will be the IAS applied?
Also, why isn't ...
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1answer
319 views
What are the equations to compute takeoff and landing distance?
I am flying a Piper 28-336 Dakota. Based on this paper I was able to reproduce the take-off distances from the POH and incorporate the calculations directly in Excel. It can be seen that the effects ...
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2answers
107 views
In general, what are the RPM ranges/differences between the various compression stages on a 2 or 3 spool (LP,IP,HP) turbojet/fan engine?
I have a general interest in jet engines and am pretty new to the topic so I wanted to toss this question into the wind as I don't have any previous experience or knowledge to pull from and haven't ...
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3answers
172 views
What would be the challenges for a pilot taking off into a headwind of just under the clean stall speed?
If a strong and fairly steady headwind was coming down the runway at just under the stall speed for a clean configuration/weight, what challenges would a pilot face? Or would it be fairly easy? Is ...
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1answer
218 views
Why does the pilot do this when taking off?
In the past (before the pandemic, of course), when riding commercial jets, I noticed that sometimes, the pilots would bank to port, then to starboard, and repeat that multiple times, while climbing ...
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0answers
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What would be a suitable angle of attack for take off?
In determining a suitable flap deflection angle for take off I am trying to come to a conclusion about the angle of attack for take off first. I have read that the highest lift to drag ratio is most ...
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0answers
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headwind, tailwind, weight, density exponents for DR400/180
I am trying to build a ground roll chart for Robin DR400/180 following the procedure described
http://www.eaa1000.av.org/technicl/takeoff/topaper.htm#References. Does anyone know the tailwind, ...
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0answers
105 views
What does a ski jump takeoff feel like?
Some aircraft takeoff from aircraft carriers using a ski jump. What does it feel like to takeoff this way? Does it feel like an alpine ski jump? How does the feeling compare to catapult takeoff?
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2answers
237 views
Is Assumed Temperature used in conjunction with a Derate in the B737 NG?
When using an Assumed Temperature for Takeoff, is it common operational practice to also use a Derate?
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1answer
206 views
In a B737 NG, when a TO is flown with an Assumed Temperature N1, is the subsequent CLB N1 also adjusted (lowered) accordingly?
The Title is my question. Because I think that if one uses a very high Assumed Temperature, the subsequent Max CLB N1 maybe higher that the TO N1.
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1answer
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What should the pilots do when fire is detected during the takeoff roll at high speed?
Let us say fire or smoke is detected during a takeoff roll when the speed is so high that the pilots can not make a full stop using the remaining runway. What is the best option: using full brake to ...
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2answers
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Did I witness an engine test for a 757 at MAN?
A while ago (Summer 2020) I was walking near MAN airport (UK) and saw a 757 taking off. There was a peculiar event during takeoff and I'd love to know what it was.
Once airborne at about 1000 feet (...
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1answer
551 views
Is a magnetic assisted takeoff feasible? [duplicate]
I have seen that there are many companies working toward hybrid electric aircraft. It is very exciting some of the ideas.
The primary reason seems to be for limiting CO2 emissions acceleration, ...
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1answer
285 views
Should "Thrust Reduction" and "Acceleration" heights be the same for the Boeing 737 NG?
Should the Thrust Reduction height be the same, lower or higher than the Acceleration Height?
In other words, what is their "correct" sequence.
I am referring specifically to the B737NG, if ...
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2answers
828 views
How does an inoperative Anti-Skid affect V speeds?
I am trying to figure out why is it that when you have an inoperative anti-skid system, the calculated V Speeds are lower?
I'm trying to see this from a performance perspective, could this be due to ...
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2answers
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1answer
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When was the concept of V1 introduced?
When was V1 speed first introduced? Was it the result of a particular accident or series of accidents?
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1answer
192 views
How can I calculate the minimum thrust to weight ratio required for a given takeoff distance?
I am building a plane and I have a take-off distance of 50ft, is there a way for me to estimate the thrust-to-weight ratio required for this constraint (even if it was in terms of say wing loading)?
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2answers
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What do we mean by taking the lowest of ZFW; TOW and LW to determine the maximum takeoff weight of the day?
Firstly, I understand that the maximum permissible takeoff weight can be limited by landing weight because landing weight plus trip fuel gives us one take off weight. We obviously do not want to be ...
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2answers
207 views
What could I do to a give a plane an emergency boost of power for takeoff?
For some reason the pilot has to take off in an emergency or is on a runway too short or maybe they just want more places they can land and takeoff. The single engine plane is already light on fuel ...
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1answer
244 views
Is it possible to increase available take-off distance for a seaplane by turning?
In the video below an A5 had an accident after takeoff. The final cause of the accident seems to be a sharp increase of AOA above stall.
Do sea planes have an ...
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2answers
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How much thrust is produced on an A320 at takeoff and during cruise?
Where can you get the drag polar of the A320 at cruise and TakeOff?
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Is "takeoff distance" measured over the ground, or to a point in the air?
I read that takeoff distance was the distance for which the airplane is on the runway, as well as the distance for which it ascends to 15 meters off of the ground.
Does it get measured as the ...
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1answer
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How does the location of the undercarriage affect 'Nosing Over'?
"The location of the undercarriage and the height from the ground of the aircraft’s centre of gravity have a very important
role in the design of aircraft. In the case of a “tricycle ...
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1answer
551 views
Are aircraft pilots required to fly runway heading for a certain distance?
If an aircraft rotates off the runway relatively quickly (runway mid-point for example), do pilots need to continue on the runway heading for a minimum distance before turning based on departure ...
