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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.

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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
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7 votes
4 answers
5k views

Why hasn't there ever been a large 4-engine commercial airplane with 2 engines on the wings and 2 engines at the tail?

This question refers to large passenger jet aircraft only, which I define as being able to carry at least 100 people. There have been many 2-, 3-, and 4-engined planes in this category. Some of the ...
DrZ214's user avatar
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11 votes
5 answers
2k views

Can jet fighters be made to be 2 or 3 times bigger than they are today?

I was watching videos on the Su-27 again, and this fighter appears to be a heavy version of jet fighters, which means it has longer range and can carry more weight. This got me thinking on what is ...
DrZ214's user avatar
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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
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26 votes
2 answers
8k views

What is the rescue arrow decal on a military jet pointing to?

I've noticed that a lot of military jets often have an arrow decal with the wording "RESCUE" pointing to a rectangle of some sort. I tried looking around for information about it but I could not find ...
Dalva's user avatar
  • 362
15 votes
3 answers
6k views

How do pilots set the exact amount of thrust needed for a reduced power takeoff?

I know jet-powered airplanes very rarely use 100% available power for takeoff, and most often reduce power to increase engine life. How does a pilot set thrust to an exact level? The airplanes I'm ...
culebrón's user avatar
  • 1,035
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
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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
17 votes
5 answers
6k views

Why does the speed of commercial airliners fluctuate, sometimes as high as 1,060 km/h or as low as 800 km/h?

I've noticed that (long-haul) airliners sometimes travel at as high as 1000 km/h (I believe I've even seen 1040 km/h), but usually they fly closer to 800 km/h, for most of the trip. This seems odd ...
user541686's user avatar
4 votes
2 answers
2k views

How were fighter jets built in the 1950's?

As far as I know, jets did not see mass production across the world until the 1950's. So I'm interested in how they were built in that time. How many different types of factories were needed? How did ...
DrZ214's user avatar
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4 votes
1 answer
2k views

How much electrical power is available in a Gulfstream G550 and from which power sources?

I'd like to understand what electrical power sources are available (engines? APU? GPU? Other?) on a larger jet like the G550, and how much power they can provide, depending on whether the airplane is ...
Aerocurious's user avatar
14 votes
2 answers
2k views

How are naval jets moved around below the deck of a carrier?

There are many kinds of jets on an aircraft carrier. I'm curious how they're moved around below deck. They have to be moved around for storage and to get to and from the large elevator that takes them ...
DrZ214's user avatar
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6 votes
4 answers
1k views

How did jet engine aircraft perform compared to the best reciprocating engine aircraft during WW2?

How did the performance of jets in World War II compare to the cutting edge propeller planes (e.g. P-51, Zero's, etc) of the day?
Hack-R's user avatar
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5 votes
0 answers
231 views

Just how much power (as a percentage) is necessary to drive a compressor in a jet engine? [duplicate]

If i understand correctly this is the "back work ratio". I'd like to know how much % of the "gross" thrust is used by the turbine to drive the compressor in a typical turbofan.
Southbob's user avatar
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10 votes
4 answers
4k views

What was the first jet-powered supersonic aircraft?

Just to clarify: I am explicitly not referring to the Bell X-1, or any other early experimental supersonic aircraft that were rocket-powered. I'm curious as to the first supersonic aircraft powered by ...
Timpanus's user avatar
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16 votes
3 answers
10k views

Why is it called "Dry Thrust"?

When reading the specifications of a jet aircraft anywhere on the Internet, it usually states that its engine produces X pounds of "dry thrust". Why is it called "Dry" Thrust? As opposed to what?
Taher Elhouderi's user avatar
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
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5 votes
1 answer
1k views

What are the relative internal noise levels in various aircraft?

What are the relative noise levels in various aviation scenarios for observers seated inside an aircraft? I'm sure the specifics depend on model but I'm curious if any general trends can be drawn that ...
curious_cat's user avatar
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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
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
2 votes
1 answer
2k views

What is SNLF technology?

Aerion together with Lockheed Martin is building the AS2 supersonic jet. This is the most realistic SS business jet project of all time. But what do they mean by SNLF technology which claims to reduce ...
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
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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
8 votes
2 answers
10k views

What is this "flap-like" thing on the back of the F-15?

I saw an image of an F-15 landing. What is that flap-like thing in the top of the plane in this picture? I couldn't find it on any other pictures or drawings of this aircraft.
Ali Erdem's user avatar
  • 343
15 votes
2 answers
3k views

Is Jetman flying above other aircraft allowed? How it is possible?

According to the Times of India: Yves Rossy and Vincent Reffet - have achieved the rare feat of flying with the innovative Jetman wings, on either side of an Emirates A380 aircraft, the world's ...
Lucky's user avatar
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10 votes
6 answers
8k views

Can a fighter jet be hit by guns?

Can a fighter jet travelling at fast speed be brought down by a weapon like an M134 Minigun or any machine gun?
Louie's user avatar
  • 203
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
2 votes
0 answers
102 views

Vapor trail disappears then reappears [duplicate]

I was watching a commercial jet and the vapor trail was moving and disappearing very quickly. I should note that it is currently 61 F on the ground, but the morning has been cool. (Min 34 F) I don't ...
MICROexchange6's user avatar
10 votes
1 answer
545 views

What is the purpose of those casing treatments and how were they designed?

The images show a kind of casing treatment used in Russian aero-engines. From what I have found out the first engine featuring this kind of casing treatment was the Tumansky R-13. Since then it was ...
rul30's user avatar
  • 1,547
20 votes
7 answers
22k views

How does a fighter jet perform good and quick maneuvers with such small wings?

Fighter jets like the F-16, F-15, etc. have wings smaller than the length of the fuselage and can perform great maneuvers very quickly while an airliner with a long wingspan takes a lot of time to ...
Ethan's user avatar
  • 9,359
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
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3 votes
2 answers
3k views

Can the HAL Lca Tejas perform Pugachev's Cobra maneuver?

Can any variant of the HAL Lca Tejas (either the naval variant, the mark 1, mark 2 or later) perform Pugachev's Cobra? If not, why?
Suraj tiwari's user avatar
10 votes
4 answers
4k views

Why are many military fighter aircraft designed to fly supersonic?

It is my understanding that these aircraft rarely fly at supersonic speeds anyway—the ordnance they carry, the increased fuel burn (even with supercruise), and the increased chance of detection make ...
Kurt Tank's user avatar
  • 652
20 votes
3 answers
11k views

How do combat jets know when to launch flares to counter IR missiles?

From my related question, it seems fighter jets do not usually track missiles by radar. Instead, they have a system that warns of radar lock. So what about infrared missiles (heat-seeking missiles)? ...
DrZ214's user avatar
  • 17.8k
10 votes
3 answers
3k views

What data did the earliest HUDs display (for fighter jets)?

Ideally I'm looking for a screenshot with a bullet list of data. I started my search at the obvious encyclopedic site and was surprised to learn that the earliest HUDs (on fighter jets) go all the way ...
DrZ214's user avatar
  • 17.8k
19 votes
2 answers
6k views

Why are HUDs usually green instead of red?

Every HUD I've seen, whether photographs or in video games, uses green light to draw the lines and text. Why green? I thought red was a better color for pilots' eyes so they can stay adjusted for ...
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
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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
4 votes
1 answer
2k views

Is it possible to use variable wing geometry on a fifth generation stealth fighter?

Is there any effect on the stealth features due to variable wing geometry? If not, why have such aircraft not been designed till now? Please explain the limitations using any structural principles if ...
Ashwath Venkataraman's user avatar
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
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
13 votes
1 answer
24k views

Why do some military jets have needle-like structures at the nose and others don't?

I have seen some military jets have a needle-like structure at the nose and some others do not have that. Lockheed SR-71 Blackbirds have that structure and Lockheed Martin F-22 Raptors do not, why so? ...
fawaz's user avatar
  • 387
5 votes
1 answer
280 views

Is a subsonic scram-jet reasonable?

By placing a de laval nozzle at the inlet, can the resulting supersonic airflow allow a scram jet to operate efficiently?
Steve Csosz's user avatar
6 votes
3 answers
2k views

Are NATO fly-by-wire fighters designed to feel like F-14 Tomcats?

Related question: Do fly-by-wire flight controls in airliners provide artificial feel? Icefire, by Judith and Garfield Reeves-Stevens, contains the following passage: When the engineers develop a ...
Steve V.'s user avatar
  • 23.3k
3 votes
5 answers
3k views

Would it be feasible to develop a dirigible-based refueling station for fighter aircraft?

The impossibly bad 2005 film Stealth featured a dirigible-based, mid-air refueling tanker station for the stealth fighters to use. At first, this seemed like it might have been the singular good ...
RoboKaren's user avatar
  • 8,071
6 votes
1 answer
3k views

What trade-offs are being made in the design of the planform alignment of stealth aircraft?

Stealth technology uses angles in the aircraft shape, and homogeneous orientation of the surfaces. In the F-22A Raptor wing leading edges, tail surfaces, air intake bypass doors, refueling aperture, ...
user avatar
16 votes
3 answers
6k views

How can you stop your missile locking onto a friendly target?

In the modern day we have advanced planes, and advanced missile systems, however, how can you stop your missile firing at a friendly aircraft? In planes like the F22 Raptor you can turn on sight lock,...
user avatar
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
9 votes
3 answers
3k views

Can jet fighter missiles descend or ascend?

I am wondering that if missiles fired from jet fighters can ascend or descend? Are they going to aim only horizontally?
Muzaffer Karaman'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