Questions tagged [thrust-reverser]

A system that redirects the air exiting a jet engine forwards or outwards, helping to slow the plane down (usually during landing).

Filter by
Sorted by
Tagged with
4
votes
1answer
715 views

Why do Dassault Falcons only have one thrust reverser?

Using all 3 engines would slow it down much faster. No?
-2
votes
1answer
165 views

What happened to Flight Sao Paulo TAM 402 flight?

I have watched a MAYDAY documentary (season 15 episode 10) and it appeared they had a reverse thrust problem. Can someone please explain to me what really happened in simpler terms? I have watch the ...
0
votes
1answer
168 views

In aircraft where the thrust reversers are not locked out when airborne, is it permissible to go around after reverser deployment?

In general, a go-around, in a jetliner, must either be performed before thrust reverser deployment, or not at all. This is because, if a go-around is attempted after the reversers have been deployed, ...
0
votes
3answers
186 views

Can tailwind produce reverse-thrust?

I know that the answer will probably be no, and this question might sound silly, but I wanted to think outside of the box. If engine air intake comes from the front, and is pushed out through the ...
2
votes
1answer
119 views

What happens when an aircraft activates reverse thrust mid flight? [duplicate]

I know that airplanes have several mechanisms in place to prevent such an occurrence from taking place, but am still curious as to what would happen if the reverse thrust activates mid flight.
1
vote
0answers
53 views

What mechanism did the turbine reversers of early high-bypass turbofans use?

Nearly all jetliners nowadays use fat, efficient high-bypass turbofans (turbofans with a bypass ratio greater than or equal to 5:1). As the vast majority of a high-bypass turbofan’s thrust comes from ...
0
votes
3answers
149 views

Why do turbofans go faster than turboprops? [duplicate]

Can someone explain why turboprops are less effective in terms of thrust than turbofans? But at the same time, why turboprops burn less fuel? For example, the Bombardier Q400/De Havilland Dash 8 has a ...
5
votes
1answer
220 views

Why use thrust reversers? [duplicate]

I see a lot of planes using thrust reversers and stopping in the middle of the runway in plane spotting videos, but I don't understand why they do it when they can obviously not use the reversers and ...
3
votes
1answer
226 views

Concorde thrust reversers engaged on parked aircraft, but not all engines?

Am I correct in interpreting this photo as showing one thrust reverser engaged, while the other is open? Do the thrust reversers fall into place on a fully powered down Concorde? Could this be caused ...
0
votes
2answers
118 views

What are the criteria for conceptual design of thrust reverser in the use of braking?

I'm doing a project: Study of aircraft braking and pre-sizing of associated subsystems. We tried to find criteria for the reverser in the braking phase. I read FAR 25, but I did not find it. Is there ...
1
vote
0answers
104 views

What are the flow properties for the engines of a Fokker 70 with reversers deployed?

I want to know what the approximate flow properties would be at the exit of the nozzle for a Fokker 70 with reversers deployed. What is the exit velocity of gas at the nozzle? How do they calculate ...
6
votes
1answer
281 views

Why does the use of reverse thrust on the DC-8 generate a pitch-up moment rather than a pitch-down moment?

Unlike most aircraft, the DC-8 is certified to use reverse thrust in flight (albeit only on its inboard engines). This serves as a very effective airbrake, although it also produces considerable ...
5
votes
2answers
609 views

Do thrust reversers only have idle and full modes or are there intermediate settings?

Are there any intermediate thrust reverser settings? If so, how often do pilots use these intermediate settings?
3
votes
1answer
68 views

Would reverse thrust increase with a decrease in aircraft forward speed when referring to propeller reverse thrust?

Would reverse thrust in a propeller increase with a decrease in aircraft forward speed?
16
votes
2answers
1k views

Are the A380 engines interchangeable (given they are not all equipped with reverse)?

I have noticed that the A380 only uses the two engines closest to the fuselage to reverse thrust to brake. Are all four engines the same (i.e.: could they theoretically swap engine 1 and engine 2) or ...
1
vote
0answers
64 views

Why did the Mercure use cascade-type reversers?

There are three main types of jet-engine thrust reversers:1 Target-type reversers are seen on most civilian turbojets and low-bypass turbofans;2 they have the instantly-recognisable buckets that ...
10
votes
4answers
3k views

How and why does the ATR-72 sometimes use reverse thrust to push back from its parking position?

Travelling with Czech Airlines via Prague in an ATR-72 I have already experienced multiple times that instead of pushback service the planes simply used their reverse thrust to leave their parking ...
4
votes
2answers
389 views

Are there any safety features to prevent reversible-pitch props from reversing in flight?

Some aircraft have propellers capable of reversing pitch, which is also known as beta angle. The example I saw was an Aviat Husky. (Youtube demonstration) I want to know if there are any safety ...
1
vote
1answer
219 views

Why does the use of reverse thrust in flight on the DC-8 cause areas of separated/reversed airflow over the wing?

The DC-8 is one of only a few jetliners that can safely use reverse thrust in flight; even so, reversing the inboard engines (the outboard engines can only be reversed on the ground) while flying ...
7
votes
2answers
4k views

Why is the A380’s with-reversers stopping distance the same as its no-reversers stopping distance?

Thrust reversers, found on almost all jetliners1 and on the larger propliners, redirect engine thrust forwards, helping to slow the aircraft in the event of a landing or rejected takeoff.2 This takes ...
27
votes
4answers
7k views

Why are thrust reversers not used to slow down to taxi speeds?

In reading this question (Would more throttle when using reverse thrust reduce stopping distance?), it prompted me to remember that on many of my flights (typically on 737s or CRJ type aircraft), it ...
8
votes
1answer
202 views

Why was the VC10 unusually prone to reverser-induced buffeting?

According to Wikipedia, the original (“Standard”) version of the Vickers VC10 had thrust reversers only on the outboard engines, as putting reversers on the inboard engines produced severe tailplane ...
0
votes
2answers
225 views

Why doesn't the Tu-154's center engine have a thrust reverser?

In this gorgeous photo of a landing Tu-154, one can clearly see that the lateral engines are equipped with thrust reversers, but the center engine is not. Why?
4
votes
2answers
435 views

Why do the 737-100/200’s thrust reversers blow fully open if hydraulic pressure is removed while the reversers are partly open?

If the thrust reversers on an Original-series 737 (the 737-100 and -200) are 2 inches or more from the stowed position, and hydraulic pressure is removed from the reverser actuators, the reversers ...
0
votes
1answer
282 views

Why are landing-distance and rejected-takeoff certification tests performed without thrust reversers?

All aircraft have to undergo testing to determine how much runway they need in order to land and come to a stop without running out of runway, and how much runway they need in order to be able to ...
18
votes
2answers
1k views

What makes it safe for the DC-8 to use reverse thrust in flight?

For most jets, the use of reverse thrust to slow down in flight, where even possible, is extremely dangerous, and strictly prohibited. Not so on the DC-8, which is certified for the safe in-flight ...
4
votes
5answers
844 views

How do thrust reversers in high-bypass turbofan engines counteract initial thrust?

I've been searching the internet for awhile and haven't really come across a good answer for this question. So: I have a basic understanding of the principles of flight (thrust, lift, drag, etc). But ...
0
votes
1answer
215 views

Could the reversers of a PW4000 on a 777 be deployed in-flight? [duplicate]

Could the thrust reversers accidentally be deployed during a flight? Here, I’m referring to the PW4000 series on a B777, where the engine is similar to the type involved in the crash of Lauda Air ...
3
votes
1answer
238 views

Can the thrust reversers still be activated if the landing gear won't extend?

In the case of Boeings, I understand that the thrust reversers cannot be activated unless the landing gear is extended. However, would it still be possible to activate the thrust reversers if the ...
7
votes
3answers
610 views

Will the steep beta descent mode become illegal for new aircraft?

The PC6 is a popular skydiver carrier due to its ability to use steep nose down beta descent to get back to the ground quickly, even beating free falling skydivers. (YouTube) FAA AC25.1155x (I only ...
3
votes
2answers
424 views

Do large Airliners use full thrust when reversers are deployed?

Do large and heavy Airliners, Jumbos and Super Jumbos wide bodies included use full thrust for braking when reversers are deployed? What is the thrust setting?
0
votes
1answer
427 views

What forces act on cascade-type thrust reverser blocker doors?

What is the stress or force that loads the cascade-type thrust reverser blocker doors? As we know, blocker doors are closed and block the airflow going through the C duct. The engine is a V2500 with ...
3
votes
2answers
571 views

Why is V1 based only on using brakes?

V1 is the speed that an aircraft may abort a takeoff so long as the airspeed is below it, or is committed to flight if it is over that speed. V1 calculations are based only on the brakes (not sure ...
7
votes
2answers
1k views

Why is Reverse thrust more effective at higher airspeeds?

It might seem logical at first but why is reverse thrust actually more effective at higher airspeeds? If we assume that engine performance will not change during a 100 knot deceleration on landing ...
3
votes
2answers
3k views

How does the reverse thrust work while landing? [duplicate]

During the landing reverse thrust of an aircraft engine is seen that the compressor fan rotates in opposite direction to counter the aircraft's forward motion if I'm right So, my question here is "...
4
votes
2answers
2k views

Why do pilots cut the reverse thrust below 40 km/h?

In a Microsoft Flight Simulator 2004 Boeing 747 landing tutorial, it was said to cut the reverse thrust after decelerating to 40 km/h. What happens if that was ignored all the way to a complete stop? ...
5
votes
1answer
117 views

Does the weather condition of the runway affect the braking of an aircraft with regards to wheel braking and reverse thrust?

I was on a 737 that landed on a snowy runway in northern Finland the other day. We had to wait around 30 minutes to land as they were waiting for it to stop snowing and then for them to clear the ...
0
votes
1answer
190 views

How common is an airliner activating reverse while still in flight? [duplicate]

Around 1977, I watched a DC-9 landing at Guacimeta airport, Lanzarote, Canary Islands, Spain, opening the flaps reversing thrust of both engines just over the airstrip end, but some 9 feet over the ...
16
votes
1answer
3k views

How does a turboprop engine keep running during thrust reversal?

For thrust reversal after landing, a turboprop engine reverses blade pitch and blows air forward. But the engine itself requires air flow for the turbine. How can a turboprop engine keep running when ...
5
votes
8answers
4k views

What would be the drawbacks of using a rotating engine as thrust reverser on airliners?

What are the drawbacks for having engines mounted on an aircraft such that their direction can be hydraulically controlled for best performance and efficiency? The idea would be to turn the engine 180 ...
5
votes
3answers
1k views

How much weight does a thrust reverser add?

How much weight does a thrust reverser add to an engine? Let's take the CFM Leap 1B as an example, which powers the new version of the Boeing 737. This engine can produce up to 130 kN of thrust for ...
0
votes
1answer
1k views

How small can turbojet engines be made whilst remaining fuel efficient, light, cheap, and producing enough thrust to carry a human, gas, and casing? [closed]

I've seen many videos of small turbojet engines (small enough to hold in your hands) that produce 30-40 pounds of force. If you mounted a couple of these on a small craft, that wouldn't even support ...
8
votes
3answers
785 views

Can you push the throttle forward while using reverse thrusters?

Can you push the throttle forward while using reverse thrusters (for turbofans)? Does this have any effect, such as strengthen the "reverse" air blanket? Is it ever used?
9
votes
3answers
2k views

Does the avoidance of thrust reverser save fuel?

On 2017-06-17 I took an AirAsia Airbus A320-200neo from Hong Kong (VHHH) to Kuala Lumpur (WMKK). The flight crew did not use reverse thrust for slowing down the plane. Trying to find an explanation ...
9
votes
2answers
3k views

What safety mechanisms prevent thrust reverser deployment in mid-flight?

I just came across the Wiki article on Lauda Air Flight 004, which was destroyed when a thrust reverser activated in mid-air. In the article, it says: The incident led Boeing to modify the thrust ...
4
votes
1answer
486 views

How does the EPR reading behave in reverse, and in reheat modes?

Will an engine pressure ratio indicator (EPR) show the same at full mil thrust as with full reversed thrust? What does the EPR indicate at afterburner active? Will it just show the same as for max mil ...
8
votes
1answer
5k views

How did the Thrust Reverser Deploy in Lauda Air Flight 004 crash?

How did the electronically controlled thrust reverser in Lauda Air Flight 004 (which crashed) get deployed in mid air without the pilot command. Was there a fault in the electronic controller, a ...
4
votes
2answers
2k views

Why is the CFM56 produced with two different thrust reverse options?

According to Wikipedia, the CFM56 could support several reverse thrust options, and it appears that it has actually been built with 2: Boeing seems to prefer the cascade type Airbus seems to prefer ...
10
votes
4answers
2k views

What is the preferred way to slow down an airliner on a long runway?

EDIT: Another way to phrase the question is, given an extra long runway, does it make sense to substitute mechanical braking (which is the primary way to slow down in a typical situation) partially or ...
9
votes
2answers
2k views

Should spoilers and reverse thrust be deployed before nose gear touches down?

On airliners, should spoilers and reverse thrust be deployed before nose gear touches down? I used to thought that deploying them will affect the handling characteristics, so it is best to wait until ...