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37 votes
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Is it possible to take off backwards using reverse thrust?

Four reasons among many others it's not possible: Weathervaning effect from the vertical surfaces of the tail would turn the aircraft as it accelerates, the tail would not remain upstream of the nose....
mins's user avatar
  • 74.7k
36 votes
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What would be the drawbacks of using a rotating engine as thrust reverser on airliners?

I wouldn't worry to much about the mass of the engine. That's actually not the biggest problem. Instead, I'd be scared far more by the angular momentum. That turbine has a large moment of inertia and ...
MSalters's user avatar
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30 votes
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Why are thrust reversers not used to slow down to taxi speeds?

A minimum max reverse power speed is often an airplane operating limitation. It's mostly related to FOD (mostly sand grains and small gravel) and on some designs there may be compressor stall issues ...
John K's user avatar
  • 132k
29 votes
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Why is the A380’s with-reversers stopping distance the same as its no-reversers stopping distance?

In all Airbuses auto-braking system aims for specific deceleration. Once the design target has been reached, the system does not apply more brake pressure although there usually is more available. So, ...
busdriver's user avatar
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26 votes
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Why do pilots cut the reverse thrust below 40 km/h?

The question speaks of a very old 747 landing tutorial. And as such I take that to mean it would be of a 747-100/200 aircraft, and that's the reference point I'm answering from. First, concerning the ...
Terry's user avatar
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26 votes

How can you move the thrust reverser to another part of the airplane?

It sounds like your professor doesn't know much about the mechanics of thrust reversers. They are attached to the exhaust end or to a fan shroud extension of an engine because that's where the air ...
niels nielsen's user avatar
21 votes

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

First drawback is going to be speed of response. The engine is big and heavy, so you aren't going to be able to spin the whole thing around in a tenth of a second. Realistically, it's going to be a ...
Daniel K's user avatar
  • 5,518
18 votes

How does the reverse thrust work while landing?

During the landing reverse thrust of an aircraft engine is seen that the compressor fan rotates in opposite direction This is wrong Reverse thrust does not reverse the rotation of the fan/compressor/...
Federico's user avatar
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18 votes
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What is the danger in the over-use of reverse thrust during ground operations when operating a turboprop powerplant?

One concern is Foreign Object Damage (FOD). More reverse thrust means more dirt is thrown into the air, which can then be ingested by the engine: Damage to turboprop engines is not as common as in ...
Bianfable's user avatar
  • 56.5k
18 votes

What is the danger in the over-use of reverse thrust during ground operations when operating a turboprop powerplant?

We used lots of reverse thrust in the C-130; it was normal to go to full reverse on landing, and also to use some reverse thrust in order to back the plane into or out of parking spots. The two common ...
Ralph J's user avatar
  • 51.8k
17 votes
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Components on engines, are they removed or blanked out?

Short answer The reverser is not installed on the outer engines. As the linked question mentions: This allows to lighten the engines, this also prevents any unwanted and hazardous opening in flight ...
mins's user avatar
  • 74.7k
16 votes

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

There will be only drawbacks, and some small practical problems such as how does the air stream into the engine when the inlet is facing backwards and we've just touched down at 150 knots. Current ...
Koyovis's user avatar
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15 votes
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What is the preferred way to slow down an airliner on a long runway?

There are several ways to slow down an airliner: aerodynamic drag friction in the wheel bearings reverse thrust wheel brakes and a few even used a brake chute, but that went out of fashion a long ...
Peter Kämpf's user avatar
14 votes

Does the avoidance of thrust reverser save fuel?

Without further knowledge of the procedures/state of the (a) airport, (b) airline and (c) aircraft , I don't think any conclusive answer could be made. To throw some thoughts in: All of Kuala Lumpurs'...
Thunderstrike's user avatar
14 votes
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Are the A380 engines interchangeable (given they are not all equipped with reverse)?

The Airbus A380 comes with two engine choices: Rolls-Royce Trent 900 Engine Alliance GP7000 The thrust reversers are not part of the core engines. The reversers are developed by the company which ...
Bianfable's user avatar
  • 56.5k
13 votes

Why don't most fighters have thrust reversers?

It has nothing to do with cost or wasting fuel. A military jet is notoriously designed to do the best it can, to hell with how much it costs. If expense of construction was a concern, they'd think it ...
Kel Harper's user avatar
13 votes

Is it possible for the Boeing 737NG to do a powerback?

Possible? Yes! But not recommended. There is nothing technical that would stop you from doing it. Thrust Reversers can be selected any time on the ground and there is enough thrust available to move ...
Bianfable's user avatar
  • 56.5k
12 votes

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

The investigation into Lauda Air Flight 004 determined that the probable cause was the deployment of the left engine thrust reverser (TR) during climb. An unsuspecting crew would not be able to ...
fooot's user avatar
  • 73.4k
12 votes

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

On a Boeing 777, the thrust levers need to be at their idle stops otherwise the thrust reverse levers physically cannot be moved aft. Once the thrust levers are at their idle stops and the reverse ...
HenryJohn's user avatar
  • 466
11 votes

Does the avoidance of thrust reverser save fuel?

There are two ways in which not using reverse will save fuel. First is the obvious, in that when the engines are throttled up to fairly high RPM for the reverse thrust, that burns significantly more ...
Ralph J's user avatar
  • 51.8k
11 votes
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Should spoilers and reverse thrust be deployed before nose gear touches down?

It depends on the aircraft (and conditions). In some aircraft like the MD-11, the deployment of ground spoilers causes a nose up pitching moment- in such a case, the spoilers should be deployed after ...
aeroalias's user avatar
  • 100k
11 votes

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

My experience is on the CRJs but most airliners are similar. Normally you can work reverse thrust variably between idle and max reverse. The reverser levers will have a stowed and locked position (...
John K's user avatar
  • 132k
10 votes
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Why do planes sometimes get a 'forward boost' when the reverse thrust is deactivated?

I've done that in CRJs when I was just freshly type rated until I learned to modulate the reversers during the landing (I don't remember the effect happening, or being noticeable at least, in the sim ...
John K's user avatar
  • 132k
9 votes
Accepted

Can reverse-thrust be used to push back from the gate?

It has been done before but is generally frowned upon due to high fuel consumption, equipment FOD caused by debris kicked up by the fan exhaust and intake suction dangers. It is just simpler and ...
Romeo_4808N's user avatar
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9 votes
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Does the weather condition of the runway affect the braking of an aircraft with regards to wheel braking and reverse thrust?

On a 737, you have essentially two detents for reverse thrust, which for lack of a better term you could call "normal" and "maximum". You can use levels of reverse thrust other than that by raising ...
Ralph J's user avatar
  • 51.8k
9 votes

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

The A380 has an optional system called Brake-To-Vacate (BTV) which allows the flight crew to calculate required runway length and determine which runway exit they can make before starting descent. ...
CatchAsCatchCan's user avatar
9 votes
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Why does the use of reverse thrust in flight on the DC-8 cause areas of separated/reversed airflow over the wing?

That's not surprising at all. What the pictures of the tufts show, and exactly what I would expect to see, is a massive injection of turbulent reverser air into the upwash just ahead of the LE, ...
John K's user avatar
  • 132k
9 votes

Why do Dassault Falcons only have one thrust reverser?

As always, it is a trade-off. On the positive side, thrust reversers allow you to slow down faster and reduce brake wear. On the negative side, there are costs to install and maintain them. They add ...
DeltaLima's user avatar
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8 votes
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Are there cases of a thrust reverser used on a turbojet engine?

Yes. The Rolls-Royce/Snecma Olympus 593 [Wikipedia] were pure turbojets and they had thrust reversers. Source: Wikimedia Also, T/R on Concorde were also used in flight (If I remember correctly, ...
Marco Sanfilippo's user avatar
8 votes
Accepted

How does a turboprop engine keep running during thrust reversal?

The prop is not blowing air away from the intake, atleast in that region. In modern propellers, the twist of the blades is such that the blade angle is smaller at the tip compared to the root. ...
aeroalias's user avatar
  • 100k

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