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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1answer
111 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 ...
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1answer
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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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3answers
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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 ...
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1answer
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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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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
151 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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1answer
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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 ...
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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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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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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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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 ...
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1answer
124 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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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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3answers
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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.
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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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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 ...
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3answers
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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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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 ...
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1answer
208 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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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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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 ...
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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 ...
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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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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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Vortices from the landing gear [duplicate]

Some time ago I was flying with my instructor on a C152. After take-off he said to me to push the brake pedals to stop the wheels rotating in order to reduce the wake from it. I have never heard about ...
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1answer
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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 ...
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311 views

What is a Second Segment Weight Limit?

I am very interested in the principles of take-off performance optimization. During my research I found an interesting picture, showing the software used by a European carrier. However, the output ...
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2answers
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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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0answers
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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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What is the minimum thrust needed to takeoff?

In passenger airplane how much thrust is required to takeoff? What factors does it depend on?
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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
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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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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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2answers
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Is “balanced field” defined with or without an engine failure?

I’m wondering what exactly means a balanced field in terms of aircraft performance. From what I know it means that TODR=ASDR, also it is minimum field length required. But I do not know whether this ...
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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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3answers
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How does early rotation increase the likelihood of a tail strike at take off?

This question indicates that an early rotation can cause a tail strike. What are the (pre-)flight dynamics that would cause this to happen vs what happens when rotating at the proper time?
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1answer
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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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What flaps position should be used for taking off from a wet runway?

If I have to take off in a C152 or C172 from a runway that's 800-900 meters (2600-3000ft) long and wet but not contaminated, what flap setting should I use to get the shortest ground roll?
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1answer
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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
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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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Take off with 0 kt ground speed [closed]

Can an aircraft take off with zero ground speed?
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What would be the challenges to taking off and landing a typical passenger jet at FL300?

Suppose it was somehow possible build a runway at FL300. Yes, doing so would be incredibly expensive, and it would be a mammoth civil engineering task, and the downsides would probably by far outweigh ...
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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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1answer
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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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How did the Wright plane takeoff/land?

I don't understand exactly how the Wright brothers handled takeoff with the first gliders and powered plane. I know it has something to do with an elevated rail track. Also, if the flying position was ...
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1answer
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What Is a “Fully Stalled” takeoff?

Reading this article (on the Boeing 737 MAX saga; irrelevant), I found the following excerpt: Boeing ultimately accepted Davies recommendation and, we understand, halted production of the 707 for ...
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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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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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1answer
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What if you refuse to fasten your seatbelt?

As a passenger, what happens / can happen if you refuse to fasten your seatbelt when you are told to, either during take off/landing or (bad) turbulences? I've recently read a Facebook post that ...
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5answers
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Why did my flight climb so sharply on takeoff?

I was on a Ryanair flight this morning that seemed to perform an incredibly aggressive takeoff from London Stansted on a 737-8. Takeoff was fairly fast, but the climb was the steepest I ever ...

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