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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19
votes
9answers
3k views

Is it bad form to call "ready to depart" when you know you won't be cleared yet?

My local aerodrome is towered and has parallel hard and grass runways. Simultaneous parallel departures or landings are not normally allowed. On one occasion we had been instructed to "line up and ...
0
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1answer
108 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 ...
21
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4answers
8k views

How does the F-35B not flip over during transition?

As the engine nozzle rotates, the lift-fan cannot. Wouldn't this imbalance of moments around the center of gravity result in the F-35 pitching up onto its back? As can be seen at 5:14 in this video: ...
8
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2answers
14k views

What determines the "acceleration" and "thrust reduction" heights?

Thrust reduction height is the height at which automatic thrust reduction from takeoff thrust to climb thrust happens. And acceleration height is the height at which you start accelerating the plane ...
18
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8answers
23k views

If flaps are used on takeoff, when should they be retracted?

If a pilot uses a notch of flaps on takeoff, when do they get retracted? At that time, what changes (i.e. climb rate, speed, pitch)? NOTE: I have purposefully not specified the type of airplane.
-2
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1answer
184 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 ...
2
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2answers
146 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 ...
1
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2answers
163 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 ...
6
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2answers
661 views

How does humidity's effects on density altitude get factored into Takeoff Distance Performance Charts?

Given that density altitude is a function of Pressure, Temperature, and Humidity, and most takeoff performance charts adjust takeoff distance as a function of pressure altitude and temperature, how is ...
3
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3answers
304 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 ...
8
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5answers
622 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 ...
4
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4answers
1k views

Why is this video of a G36 Bonanza taking off so scary?

Why is this video of a G36 Bonanza so 'scary'? If they had clipped the top of the trees, would it really have brought the plane down? (And even if yes, it looks pretty ...
8
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3answers
3k views

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 ...
10
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2answers
10k views

Why is "clearway minus stopway" used in V1 adjustments?

Illustrations and/or satellite imagery to explain the difference between clearway and stopway and explaining how they are used by turbine aircraft would be great. From B787 FCOM.
9
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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 ...
1
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1answer
109 views

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 ...
0
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2answers
141 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 ...
7
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1answer
508 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. ...
5
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2answers
794 views

How will a variable pitch propeller move during takeoff?

In my ATPL books i've learned that for a variable pitch propeller, it is better to have a fine pitch for take-off (higher RPM) and a coarse pitch for cruise (lower RPM). In this question taken from ...
8
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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?
18
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1answer
72k views

How are take-off segments defined?

From take-off performance calculations I remember that the take-off and initial climb was expressed in a number of segments. Each segment had its own performance requirements. I presume they are ...
4
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2answers
211 views

Are intersection takeoffs less common in the USA than in other countries?

On a recent trip through Australia I did a number of intra-oz flights. In at least three of the cases we performed intersection takeoffs, a couple at MEL/YMML and one at BNE/YBBN. I have at least a ...
33
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2answers
9k views

Why don't helicopters always takeoff from a hover out of ground-effect?

I've read enough crash reports to see that helicopters discovering too late in takeoff that they lack the power to fly out of ground-effect is a serious problem. I am wondering why the following isn'...
7
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1answer
528 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 ...
3
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2answers
748 views

What is the best method for an emergency takeoff?

(YouTube) Before the collision at Tenerife the pilot of KLM Flight 4805 caused a 22-meter (72-foot) tail-strike by rotating early (I can't say that I blame him given the circumstances). Is dragging ...
22
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3answers
8k views

What is this smoke coming from an F/A-18 shortly before takeoff?

Watching a video of F/A-18 fighter-jets taking off, I noticed some sort of gas blowing out behind the canopy shortly before the start of the takeoff roll. Here's a screenshot: In some videos the ...
28
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4answers
9k views

When does an airliner switch from using the tiller to the rudder?

When does an airliner switch from using the tiller to steer to the rudder on takeoff? Same for landing- when does the pilot switch from using the rudder to the tiller? What is this process? Once a ...
-3
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1answer
143 views

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 ...
18
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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 ...
20
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3answers
2k views

What is the procedure for a rejected Jet/Rocket Assisted Takeoff (J/RATO)?

Seeing the image of a Lockhead LC-130 doing a jet assisted takeoff in snow mentioned in this answer, I wonder: What is the procedure for a rejected takeoff when using JATO? Can the JATO rockets be ...
7
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1answer
430 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?
3
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1answer
305 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 ...
0
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1answer
187 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 ...
14
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1answer
12k views

How is Calculated TakeOff Time (CTOT) calculated?

This answer mentions: How these CTOT times are calculated is very complex, and deserves another question if you are interested. I'm interested. How does it work? What is the level of complexity ...
10
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2answers
3k views

How dangerous is to take-off and fly with snow on the wings?

I have seen a video of a commercial aircraft taking-off with snow on the wings. I wonder how dangerous it is to take-off and fly with snow on the wings.
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3answers
174 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 ...
5
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3answers
1k views

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?
17
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4answers
9k views

When to reduce power on takeoff (Cessna 182 or similar)?

There are two sides I've heard when taking off in a Cessna 182 or other small airplane with a normally aspirated engine driving a constant speed propeller: As soon as your wheels are off the ...
4
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1answer
298 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 ...
0
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1answer
136 views

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 ...
5
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3answers
5k views

Why do most A320s make that distinct scream on takeoff?

I've noticed that the engines on the A320 make a very a distinct sound on takeoff. Is there something about the CFM-56 series that causes this? This noise can be heard in this video.
0
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2answers
91 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 ...
5
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2answers
921 views

How does the flap configuration affect the tailstrike limit on the A320 aircraft family?

The configuration that provides the maximum FLEX temperature varies with the runway length. On short runways, CONF 3 usually provides the highest FLEX temperature, and the tail clearance at lift off ...
0
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3answers
167 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 ...
8
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3answers
19k views

What is the difference between Assumed Temperature and Derate takeoff thrust?

Airlines like to avoid a full thrust takeoff as it increases the wear on the engine. There are two methods to achieve this: Assumed Temperature and Derate. In the Assumed Temperature method, the ...
-2
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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 ...
0
votes
0answers
59 views

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 ...
10
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7answers
12k views

Is it possible to takeoff without flaps extended?

related questions: landing wihtout flaps takeoff with full flaps My question focus on passengers jets (goes from Embraer E-jet family to Airbus A380). I don't know why pilots would attempt to ...
15
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3answers
44k views

What is the maximum take off climb angle of a Boeing 737 MAX?

This video is making its rounds on social media claiming to show a 90 degree vertical take off: One can not tell from the video alone what the angle is. Does anyone have a third party reference for ...
30
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7answers
9k views

Why tap the brakes on take-off in fixed gear aircraft?

The Socata TB10 checklist indicates that you should touch the brakes after lift-off. I assume this is to stop the wheels from turning, but why? In a retractable gear aircraft this would make sense to ...

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