Skip to main content

Questions tagged [jet]

*Jet* is a generic, informal term for an aircraft with jet propulsion. In a civilian context it may refer to an airliner or small private jet.

Filter by
Sorted by
Tagged with
21 votes
2 answers
40k views

Why don't big commercial planes have full aircraft parachutes?

On smaller aircraft, like some Cirruses for example, they have parachutes attached to the body of the aircraft that can help the plane get to the ground safely in an emergency. I'm wondering why ...
Jae Carr's user avatar
  • 24.2k
72 votes
12 answers
17k views

Why don't commercial jet aircraft have a break-apart, parachute escape system?

Imagine that the pilots on a jet aircraft determine that it will crash. Consider what would happen if the design of the craft allowed it to: Break into four pieces Each piece is pressurized ...
Corey's user avatar
  • 777
14 votes
4 answers
4k views

How do jet engines work?

I was doing research about jet engines, and they seem really difficult to fully understand. So, can anyone explain it in a simple way? An afterburner glows on an F-15 Eagle engine, source: Wikimedia. ...
Gabriel Brito's user avatar
35 votes
2 answers
96k views

Which engine is more efficient between turboprop vs jet?

Are turboprops really more efficient than jets? If yes, does that mean that airlines who use jets sacrifice fuel for faster flights?
Taher Elhouderi's user avatar
36 votes
14 answers
13k views

Why do passenger jets accept input that will cause the aircraft to perform dangerous maneuvers it was not designed for?

Examples: A bank angle > 45 degrees is considered an “upset,” putting the plane in a position that can lead to a loss of control. A pitch > 20 degrees can possibly be dangerous and cause the ...
user1151923's user avatar
95 votes
11 answers
61k views

Why do fighter jets still have guns/cannons?

I noticed that the "new" F-35 still has a GAU-22/A cannon installed in it -- albeit with only 182 rounds (more with ammo pods). Why do fighters still have cannons? The day of dogfighting is long ...
RoboKaren's user avatar
  • 8,071
5 votes
3 answers
5k views

Why are the top speeds for jet engines higher than for propellers?

I realize turbines are more efficient than piston engines, but if that were true, then why don't turbo-props reach jet speeds?
yippy_yay's user avatar
  • 7,375
52 votes
9 answers
22k views

Why don't aircraft use nuclear propulsion?

Nuclear propulsion research for aircraft was abandoned during the 50's. Why wasn't it revived ever?
user avatar
22 votes
2 answers
10k views

How do fighter jets communicate with an intercepted plane that's lost comms?

RAF Typhoons were scrambled today to intercept an Antonov 26 that lost comms, triggering a sonic boom over London. The flight was escorted to Stansted airport, and the answer at What's the point ...
Danny Beckett's user avatar
53 votes
7 answers
15k views

Why do fighter aircraft manufacturers still focus on making their planes more dogfight-worthy?

In today's age, when dogfights are simply a relic from the past, why do manufacturers keep on increasing their aircraft maneuverability, in order to make them better dogfighters. It is more ...
Madhav Sudarshan's user avatar
49 votes
2 answers
39k views

What are these wavy lines on fighters' canopy?

As shown in the images below, what are these wavy lines on the canopy of the aircraft? Do these lines have any utility? These are mostly captured in videos of cockpit views of carrier-based aircraft.
Raj's user avatar
  • 2,088
35 votes
3 answers
5k views

When might a pilot hand-fly a jet at cruise altitudes, and is it difficult?

How difficult is it to hand-fly a jet at cruise altitudes? Other than autopilot failure and just doing it for the fun of it, when might you want to hand-fly at those altitudes? I suspect the answer ...
Terry's user avatar
  • 39.2k
30 votes
12 answers
14k views

Why does flight training usually start with (unsafe?) propeller planes and not with (safer?) jets?

I live in the UK and would like to learn flying jets, but most courses seem to start with propeller planes. Not sure if this might be a misconception about the safety of different aircraft types, but ...
PropellerHater's user avatar
29 votes
6 answers
6k views

Can a fighter jet land on a modified airliner?

Imagine this scenario: A modified military 747 is flying at a constant speed and altitude. On the top of the fuselage there is a device like a helipad but with three holes to accommodate the fighter ...
user60684's user avatar
  • 847
126 votes
9 answers
42k views

How do jet fighters get to war?

Currently Australia is deploying F/A-18E/F Super Hornets to the UAE to fight in Iraq. Obviously the UAE (and Iraq) is a very long way from Australia and well beyond the typical range of one of these ...
thexacre's user avatar
  • 1,260
41 votes
4 answers
87k views

Why does an aircraft leave a white smoke trail?

Why does an aircraft leave a white smoke trail?
Tom's user avatar
  • 513
32 votes
3 answers
20k views

Why do turbine engines take so long to spool up?

Piston engines reach full rpm within a second or two, but turbines take much longer. Why is that?
ptgflyer's user avatar
  • 2,156
11 votes
3 answers
5k views

Where does the Oxygen for the emergency gas masks come from?

Normal commercial jets drop gas masks when cabin pressure drops, and supply oxygen, but, where does that oxygen come from? Do commercial jets store oxygen? If they do, isn't pressurised oxygen very ...
ppp's user avatar
  • 1,415
2 votes
2 answers
4k views

Is the SEPECAT Jaguar's design aerodynamically inferior to more modern jets?

If we compare the SEPECAT Jaguar's design with the latest jet fighters, what aerodynamic shortcomings do we find in its design? (I'm only asking about aerodynamics, not AESA radars, electronics suites ...
user avatar
33 votes
8 answers
8k views

Can someone/something other than the pilot trigger the ejection seat?

Let's say there was a two-person jet (take the F-15 for example) that was involved in some sort of accident in the air that incapacitated the pilot (unconscious but still alive) and left the aircraft ...
codedude's user avatar
  • 986
29 votes
9 answers
166k views

Why do some fighter jets have two pilots while others have only one?

Why do some fighter jets have two pilots, while some have only one? For example the newer fighter jets such as Dassault Rafale, Eurofighter typhoon etc. are mostly with single-seat, but two-seat ...
anshabhi's user avatar
  • 11.5k
19 votes
2 answers
2k views

When does the use of afterburners save fuel?

An afterburner uses a lot more fuel for a little more thrust (rule of thumb: 50% more thrust for 5 times the fuel flow with full dry power). Is a flight maneuver possible where using the afterburner ...
Peter Kämpf's user avatar
14 votes
1 answer
2k views

How is fuel stored and routed on a trijet with one engine at the tail?

This question pertains to trijets with two engines on the wings and one at the tail, like the Lockheed Tristar. It does not pertain to trijets with all engines at the tail, like the Tu-154. (And it ...
DrZ214's user avatar
  • 17.8k
10 votes
1 answer
3k views

Do fighter jets have forward-looking radar warnings for missiles, and when was this first implemented?

Let's imagine a swarm of fighter jets intercepting another swarm. Both groups are moving head-on towards each other. Once they get in range, they will probably lock on and fire missiles. Do fighter ...
DrZ214's user avatar
  • 17.8k
4 votes
1 answer
5k views

How is TAS affected by wind?

Does True Air Speed (TAS) change with wind speed and direction? My understanding is that if an aircraft were travelling at 470kt TAS, with a hundred knot tailwind, the ground speed would be 570kt. In ...
Brady Joe's user avatar
  • 123
2 votes
1 answer
3k views

Where does the final cooling take place in the air cycle machine of the air conditioning system?

On aircraft with an ACM air conditioning, where does the final cooling take place? Is it in the ACM expansion turbine or in the ACM compressor?
KM320's user avatar
  • 349
63 votes
6 answers
107k views

How do fighter pilots manage food, drink & toilet?

There doesn't seem to be any place to bring food or drink. And what about WC? And for single seat combat planes?
carbalona's user avatar
  • 631
26 votes
2 answers
8k views

Why does NASA have F/A-18s?

I always remember playing FSX as a kid and using the NASA F/A-18, and never thought much about it. And then I saw the picture of the Space Shuttle on top of the 747 being escorted by these planes. ...
Keegan's user avatar
  • 6,897
25 votes
6 answers
69k views

What is an afterburner and how long can a jet fly on afterburner?

I heard this word so many time in military documentary about jets, especially fighter jets, but I don't fully understand what it is or how it works. In a documentary from the Discovery Channel, all ...
TBBT's user avatar
  • 1,862
20 votes
5 answers
8k views

Why don't most fighters have thrust reversers?

With the exception of the Panavia Tornado, fighters do not have thrust reversers. Why is this? Why does the Panavia Tornado have them?
Madhav Sudarshan's user avatar
16 votes
3 answers
4k views

Why isn't the F-15E called F/A-15?

In my understanding, "F" stands for "fighter" (air-to-air) and "A" for "attack" (air-to-ground). E.g., the F/A-18 Hornet can attack air and ground targets, which is why it's called F/A-18. the A-10 ...
jklingler's user avatar
  • 3,827
14 votes
1 answer
8k views

Why are the in-flight refueling probes of French-built fighter aircraft non-retractable?

French-built fighter aircraft seem to have in-flight refueling probes that are not retractable, as seen from the linked images below. What are the advantages of a non-retractable refueling probe that ...
Avi A. Shunn's user avatar
12 votes
1 answer
14k views

Do military pilots have flight & rest hours regulation?

I have read that civil pilots have stringent regulations regarding flight hours and hours of rest between flights. What about military pilots? Does it change between wartime and peacetime? Between ...
sdfsdf's user avatar
  • 1,225
10 votes
4 answers
8k views

Are strategic bombers still useful, or are fighters taking over this role?

During the mid 20th century and cold war, armies were having clear distinction between those aircraft designed as strategic bombers and those designed to be fighters for aerial combat. My ...
Trebia Project.'s user avatar
9 votes
2 answers
9k views

What is the average speed used by modern jet fighters when in dogfight?

I am asking this question pertaining to a game I'm designing. It is well known that many modern jet fighter aircraft can fly at supersonic velocities however I read that this top speed is hardly ever ...
user1062760's user avatar
8 votes
1 answer
3k views

Why do forward-swept winged fighters have the main wings in the back?

These are the only 2 fighter jets I know of with forward-swept wings. (Su-47 and X-29, they're both still experimental). As you can see, they both have their wings in the back, not the middle. Why is ...
DrZ214's user avatar
  • 17.8k
6 votes
2 answers
5k views

Why does the diffuser section generate thrust in a jet engine?

I am studying the thrust distribution of jet engines. But I'm now a bit confused. In Rolls-Royce's "The Jet Engine" book, http://aeromodelbasic.blogspot.com/2012/05/thrust-distribution-distribution-...
Jono's user avatar
  • 161
5 votes
2 answers
6k views

What is the absolute velocity change through compressor+burner?

I thought that the velocity going through a turbojet increased as it went through the compressor and the burner. Intuitively, if the pressure/enthalpy increases, so would the velocity, right? I came ...
Jose Lopez Garcia's user avatar
5 votes
1 answer
4k views

What is the exhaust port on the tail of jetliners for? [duplicate]

Jetliners usually have their engines mounted on the wings, so what is the exhaust port on the tail for?
SnakeDoc's user avatar
  • 2,438
5 votes
1 answer
2k views

Is there a model to calculate fuel burn over the Atlantic ocean given an arbitrary aircraft identification?

Is there any accurate model that can take flight data, plane identifications and compute the amount of fuel that the aircraft would burn flying a set route over the Atlantic ocean.
user1750289's user avatar
5 votes
2 answers
4k views

How is mass flow rate computed?

I have been wondering how the mass flow rate is determined by the area of the engine air intake surface and the incoming speed of the air. In still air, it is understandable that a stationary engine ...
tzy's user avatar
  • 283
3 votes
2 answers
2k views

Is it possible to survive a free fall from an airliner at cruise altitude?

If an airliner were to breakup in flight, and a passenger were ejected from the cabin, would it be possible to survive the fall? Assume that the aircraft broke up at a cruise altitude 30,000-35,000 ...
10 Replies's user avatar
3 votes
4 answers
4k views

What drives the shape of an engine's intake on a fighter jet?

Rectangular intakes have more corners which might increase subsonic pressure losses and would weigh larger than a pitot (Semi-circular) type intake. Are the designer drivers solely based on supersonic ...
jetlight's user avatar
1 vote
1 answer
465 views

How much does a drag chute system weight?

How much weight does a drag chute add to a plane? Let's take the Tu-114 as an example. This plane has a loaded weight of 68.1 tons (I could not find a max landing weight figure). I could not find how ...
DrZ214's user avatar
  • 17.8k
64 votes
11 answers
26k views

Are the guns on a fighter jet fixed or can they be aimed?

Are the (built-in) guns on fighter jets fixed, or can they be elevated up and down or panned right and left for aiming? In other words are fighter jet guns aimed by pointing the whole aircraft at the ...
MemphisGuru's user avatar
62 votes
5 answers
50k views

How is a missile lock detected?

How can a fighter aircraft involved in a face-off detect a missile lock from a trailing aircraft so that it can make evasive maneuvers?
Amod's user avatar
  • 1,417
45 votes
3 answers
39k views

Why do many fighter jets have double vertical stabilizers?

Many fighter jets have double vertical stabilizers, e.g. F-14, F-15, F/A-18, F-22: On the contrary, most general aviation planes and commercial airliners do not. While there are certainly exceptions ...
kevin's user avatar
  • 39.8k
42 votes
3 answers
41k views

Do jet fighters have air conditioning systems?

In most jet fighters, the cockpit is a glass dome and the pilots are exposed directly to the sun. In addition, they are wearing flight suits and full face helmets (most of the time). I can only ...
Burhan Khalid's user avatar
39 votes
5 answers
48k views

On the F15-E, can the WSO take over if the pilot is incapacitated?

The F15-E Strike Eagle features a two-man cockpit. The pilot in the front seat and the WSO (Weapons System Officer) in the back seat. If the jet is cruising straight and level is mechanically sound ...
user1352057's user avatar
  • 1,445
35 votes
4 answers
22k views

Do fighter jet pilots ever use autopilot?

I know that military jets have autopilot, but do the pilots actually prefer to use it? I ask this question because, unlike civilian airplanes, military jets are more likely to come in a situation ...
Registered User's user avatar