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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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 ...
3 votes
2 answers
765 views

On a small/micro jet engine, can the turbine blades and vanes be made out of ceramic?

I am researching on how to make a small jet engine, and trying to figure out the materials for rotor and stator blades just after the combustion chamber so that they can hold up to the temperatures ...
3 votes
2 answers
303 views

Why was the Me 262's top speed at 6km?

The P-80 had its top speed at sea level, but the Me 262 achieved its top speed at 6km altitude. What were the reasons for this? Was it that the engine was designed for such an altitude to deal with ...
2 votes
1 answer
444 views

Will the new USAF trainer Boeing–Saab T-7 Red Hawk have weapons?

Will the new USAF jet trainer, the Boeing–Saab T-7 Red Hawk, have weapons? I see the mention of the possibility of hardpoints e.g. here: https://www.thedrive.com/the-war-zone/42760/air-force-wants-...
5 votes
3 answers
847 views

How does momentum thrust mechanically act on combustion chambers and nozzles in a jet propulsion?

I'm asking this question since I can't intuitively understand how the acceleration of mass flow and therefore the increase of its momentum can actually mechanically act on the combustion chamber ...
3 votes
2 answers
375 views

Does anyone know more about the 1958 Heinkel-211 project?

Industria Aeronáutica Argentina worked in the 50s in a Jet airliner, Kurt Tank design, the IA-36, 'Cóndor', with simmilarities to 1958 Heinkel-211 project, turbines intake aspirating fuselage boundary ...
28 votes
1 answer
9k views

What does this hand gesture of fighter jet pilots mean?

I am trying to understand more of the gestures fighter jet pilot use. I have seen this gesture many times: Does anyone know what this gesture mean? Are there any good resources about the gestures ...
7 votes
1 answer
276 views

Why do the arresting gear cables need to be pushed/ guided back?

Also, what is the yellow metal stick officially called?
25 votes
2 answers
5k views

Slanted Brown Rectangles on Aircraft Carriers?

What are the rectangles adjacent to the arresting gear on Aircraft Carriers? Are they service hatches? https://www.kastalon.com/wp-content/uploads/2017/10/ford-emals-3.jpg
20 votes
3 answers
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Which fighter jet is this, based on the silhouette?

6 to 8 of these planes flew through the Ogwen Valley in North Wales, UK, this morning (2nd of June). Hawks and other training jets are common sights, but I’ve not seen these before and can’t identify ...
0 votes
1 answer
113 views

What increases the rotational velocity of air in an axial flow compressor?

In an axial flow compressor as used in modern jet engines, the goal of a compressor rotor is to increase the angular momentum of the air by imparting an increase in swirl velocity. (Note: the goal of ...
4 votes
1 answer
272 views

Nutritional value of jet fuel (from a microbe's point of view) and which of their byproducts is causing the fuel tank corrosion?

Self-described "pilot, aerospace engineer, and mad scientist" YouTuber Jack Schneider's video Growing Microbes in Jet Fuel explains that if a layer of water accumulates below jet fuel (due ...
-1 votes
4 answers
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Why do we consider that air comes into jet engine?

While calculating air pressure and temperature during cruise of jet engines, we consider that air comes into the jet engine inlet with our flight velocity. But why? In fact, air stops stagnant in ...
0 votes
1 answer
265 views

What were the main differences between Whittle's British turbojet and Von Ohain's German one?

I cannot fully understand in simple words the differences between the axial flow engine (Von Ohain) and Whittle's centrifugal turbojet.
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 ...
8 votes
1 answer
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Why are most of KBOS's instrument departures and arrivals jet-only?

I was looking through the big book o' KBOS instrument procedures when I noticed that almost all of the airport's SIDs and STARs are marked "NOTE: For turbojets only" or some variation ...
21 votes
4 answers
6k views

What kind of jet plane is this?

The cockpit can hold one person, is smaller than a compact car and as narrow as a motorcycle. What kind of plane is this and how hard would it be to fly?
8 votes
3 answers
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What is this plane seen in Mobile, Alabama?

This was taken at the USS Alabama in Mobile, Alabama. It is probably a US Navy aircraft.
1 vote
3 answers
436 views

What long-range jet is easiest to fly?

Of jet aircraft with sufficient range to cross the Atlantic on a full tank of fuel, which is easiest to fly? More specifically: The required range is from New York's JFK Airport, to Shannon Airport, ...
11 votes
5 answers
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Buzz-saw noise from big turbofans at high thrust

This topic has been addressed many times on this and other forums. I have seen (and often not fully understood) some deep technical analyses, incuding manufacturers' research labs, since this is a ...
-2 votes
1 answer
320 views

What does "throttle is staggered" mean? [closed]

What does "throttle is staggered" mean? and how is it related to adjustment of MEC(Main Engine Control) in B737-300(CFM56-3C)?and which are safety issues regarding that?
0 votes
0 answers
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Why do air planes not have a "grating" in the front of the jet engines for safety? [duplicate]

This is what a typical jet engine looks like: Considering the horrible dangers with birds getting in there and crashing planes, why doesn't it look like this? Why don't they have a "grating&...
20 votes
4 answers
9k views

Is it possible to fly around the world to stay in daylight with a fighter jet?

I was wondering if it is possible for a fighter jet to fly around the world and stay in daylight? For the Southern and Northern Hemisphere, the time and speed of daylight is different during seasons. ...
6 votes
4 answers
6k views

Can electricity be harvested from magnets in jet engines?

I was reading about bleedless-787 power system but found out it still requires a gearbox. What if you put coils around the "tube" part of the jet and tiny magnets in the end of the fan/...
13 votes
4 answers
2k views

Are modern fighter jets allowed to fly with an inoperative ejection seat?

I'm wondering if a modern fighter jet (Eurofighter, JAS Gripen, F-35 etc.) is allowed to fly when the ejection seats are known not to be in working order.
41 votes
3 answers
40k 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 ...
0 votes
1 answer
526 views

Understanding fuel tanks/pumps of Fighter jet

I have observed fighter jets performing maneuvers like inverting, Turing around in sharp angles etc. This may subject plane to G forces and other dynamic forces. How does fuel tank ensure steady ...
1 vote
1 answer
3k views

How does the F-16 engine startup work?

So, the simplest way to start up an F-16s engine is to flip the power switch to "main power" and then set the "jet fuel" switch to "Start 1" or "Start 2". I ...
10 votes
4 answers
3k 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 ...
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 ...
4 votes
2 answers
2k views

Is there an aircraft that can go supersonic at sea level without using afterburner?

Is there an aircraft that can go supersonic at sea level without using afterburner? Quick look through the "supercruise" capable aircraft might be helpful in narrowing down the possibilities, though I ...
39 votes
5 answers
47k 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 ...
2 votes
0 answers
134 views

How is %MAC affected by flap/slat position on swept wing, transport category aircraft?

If you watch the slats and flaps deploy on a swept wing, transport category aircraft, and you mentally draw a chord line, you'll notice that it's changing through the slats/flaps deployment schedule. ...
64 votes
11 answers
25k 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 ...
31 votes
5 answers
7k views

How do aircraft refueling in-air deal with wake turbulence?

Many fighter planes have the capability to refuel in air. When a plane moves in air, turbulence is generated at its back. To refuel, the fighter plane must come near to the parent plane (which has ...
7 votes
5 answers
594 views

Were there any test flying incidents during which the pilots managed to escape the plane?

I am only asking about flight testing civilian jets, not military ones. I know that all test pilots have to be equipped with a parachute, so I wonder was there any incident where the test pilots and ...
3 votes
0 answers
311 views

What is the highest operational ceiling for a nuclear scramjet?

A similar question is: What is the highest operational ceiling for an air-breathing jet engine? The answers point to scramjets. Cited reports focus on combustion kinetics. The Wikipedia Scramjet page: ...
4 votes
4 answers
4k views

What is maximum acceleration that can be achieved by afterburner in level flight?

I am wondering how a fighter jet (let's take F-22 for example) would compare to other vehicles in terms of acceleration while in flight. For cars and motorcycles, achieving 0-100 KPH in 2 seconds is ...
2 votes
0 answers
164 views

Overheating (fire thrown out of the nozzle) [closed]

At first I copied https://www.jetcat.de/en/productdetails/produkte/jetcat/produkte/hobby/Engines/P160_rxi_b Where I manufactured and installed all the parts and they are very similar to the original ...
7 votes
1 answer
2k views

What are all the composites used in the making of fighter jets? What is the green and yellow material on the aircraft in the pictures below? [closed]

Below given are images of various fighter jet manufacturing.
14 votes
9 answers
9k views

Were propeller airplanes significantly more "scary" to fly in compared to modern jet ones?

I've flown exactly once in my life. It was in 2004, with a commercial jet. Not a "jumbo", but a normal-sized jet plane in common use for cheap flights in that year. (Well, twice if you ...
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 ...
5 votes
3 answers
5k views

What would be the potential thrust of an "electric jet" like Lilium's?

Lilium claims to fly with "electric jets". Throwing out the debate over whether a non-combustion compression of a stream of air is a jet or only a ducted fan, what is the potential thrust each of ...
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 ...
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?
32 votes
9 answers
14k views

Is it correct that a jet fighter can be used as a non-lethal (sonic) weapon?

Imagine you have a crowd of people, who want to go to a certain territory (e. g. close to the border). An airplane flies over them such that when it reaches supersonic speed, there is a loud bang. ...
4 votes
2 answers
987 views

Why aren't quadjets required to remain controllable after a sudden, simultaneous failure of two engines on one side?

For all multiengine jets, it must be possible to maintain directional control of the aircraft in the event of a sudden failure of one engine in flight, with the other(s) firewalled, down to not far ...
0 votes
2 answers
2k views

What is this very distinct humming noise coming from the IAE-V2500 engines of the A320 during taxi?

So I am a huge fan of the A320, and in a less broader sense, the A320 with IAE-V2500 engines. Arguably the greatest engines in the industry with the greatest sound. However though, I've had a question ...
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 ...
1 vote
2 answers
2k views

What is the cheapest plane one can buy to fly above Mach 1 and be able to pull 8g plus?

Which plane would you suggest for someone who would like to be able to fly fast enough to break the sound barrier, yet also be able to pull lots of Gs? What would be the price of such a plane, and ...

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