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Questions tagged [engine]

For general questions related to aircraft engines; use a more specific tag, such as [jet-engine] or [piston-engine], if possible.

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5 votes
3 answers
2k views

Structure that holds the twin-engine on an aircraft

What is the name of that big structure (in red) that holds the engine?
10 votes
1 answer
158 views

Is there any version of CFM56 with can combustors?

This lamp is sold online: They claim it's made from a CFM56 combustion chamber. It looks like a can combustor, and I read everywhere that CFM56 uses an annular combustor. Is there a version of CFM56 ...
-1 votes
5 answers
939 views

Why don't airliners use engines one behind another?

Why do airliners use the engines the way they currently do and not one behind another?? Would it not lead to better thrust and in case any one of the 2 engines placed together has to fail, the 2nd one ...
1 vote
1 answer
96 views

why does the bottom of a 737 - 800 engine look slightly flat? [duplicate]

The 737 - 800 is one of my favorite airliners and so I've always noticed that it's engines look a bit flat on the bottom, I haven't seen any other airliners do this so, is there any specific reason ...
0 votes
1 answer
151 views

What does the suffix "A“ mean on specific PW1100G(A) engines?

Some time ago I tried to find out what the difference between a PW1100G and a PW1100GA exactly is. I am asking this question here because there seems to be no information online that could be useful ...
2 votes
0 answers
63 views

Why B737 CFM56 engine sounds like heavy wind sound at Throttling up?

14:14 ~ 14:21 : Throttle Up (with heavy wind sound 14:22 ~ 14:23 : Engine reached certain %, and no heavy wind sound 14:23 ~ : Throttle Up (with heavy wind sound) I always wonder why only B737NG with ...
4 votes
4 answers
1k views

Why the combustion chambers of a turbine engine aren't used to spin the compressor like a firework wheel?

I searched here in this stack and the only question I found was this one, but I feel like it wasn't very well worded and it is also considered a duplicate. If this question is considered a duplicate ...
14 votes
3 answers
12k views

How hot do internal parts of jet engine get?

How hot does a jet engine get? I'm interested in the temperature of the parts, not of the exhaust or combustion. If you took temperature of an engine after a flight across the Pacific Ocean what are ...
0 votes
4 answers
324 views

Why cant all planes use the best engines like the GeNX or the Trent XWB?

Why do airline manufacturers not prefer using the best engines(max thrust: weight ratio and best efficiency) for their airplanes? Doesn't this just not lead to lower sales and losses for the company? ...
0 votes
1 answer
699 views

Is it possible to create a direct supersonic airflow to a turbofan's afterburner in order to enhance the performance or reduce the fuel consumption?

so I found out that SR-71 Blackbird is using what's called "turboramjet" and I find the idea a bit appealing since they say with such engine, the Blackbird is more fuel efficient at it's top speed. I ...
1 vote
0 answers
443 views

What is the specific fuel consumption and cruise thrust of PW1521G engines?

I'm looking for the specific fuel consumption (SFC) and thrust related to PW1521G in cruise regime, as well as the associated assumptions for these ratings. I can't find them online.
1 vote
1 answer
109 views

Which Piston General Aviation Aircraft Engine Has the Longest TBO?

After doing some initial research, it appears most GA piston engines have a recommended Time Between Overhaul of around 2,000 hours. I was wondering if there are any other engines that may have a ...
2 votes
1 answer
207 views

Do military transport aircraft engines rely on the same supply chain as the civilian version?

I know that some military transport aircraft share the same engine as civilian aircraft, e.g., the TF39 used in C-5A was called CF6 in the civilian market. When the manufacturer makes the plane, do ...
12 votes
3 answers
6k views

How did the sailor survive getting sucked into an engine?

I'm sure we've all seen the famous video of the Navy sailor getting sucked into an engine. Can someone explain how was this possible? I've read many comments but still don't have a visual idea how ...
5 votes
2 answers
1k views

What kind of combustor are these engines using?

I'm familiar with the wikipedia-standard can/can-annular/annular style combustors, but I've found a design that don't seem to fit into any of these categories, used in a number of engines such as the ...
0 votes
0 answers
30 views

how can we calculate normal force or vertical component of propeller in an aircraft?

when we calculate thrust of an propeller engine we also face to vertical component or normal force which change neutral point of an aircraft how can we calculate this force? thank you
3 votes
1 answer
453 views

How would you know the difference between a compressor stall and a surge based on indications in the cockpit?

I understand the difference between a compressor stall and surge. Stall: One or two blade stages exceed the critical AoA, the airflow is turbulent, and the smooth airflow through the compressor is ...
11 votes
4 answers
9k views

Why was the engine of the Ju-87 Stuka not replaced with a more powerful one?

Related to this question Why did the Ju-87 Stuka have a siren? I would like to know the reasons why they have not changed the engine of the Stuka when they realised it was easy prey for Hurricanes ...
4 votes
1 answer
909 views

Are there modern airplanes with two propellers driven by one single engine?

Except 1903 Wright flyer, are there any other airplane using one single engine driving two coplanar propellers? Coplanar means push-pull and coaxial designs are not in the question's frame. Tilt ...
0 votes
5 answers
364 views

How/why does engine torque and horsepower affect aircraft speed? [duplicate]

I'm curious as to why torque and horsepower affect an aircraft's speed. AFAIK, it's only the engines RPM that affect speed, right? Does this mean an engine's torque/horsepower only affects the speed ...
6 votes
1 answer
3k views

How big would a single propeller need to be on a 737?

If you wanted a 737 to have the same design as a single prop light aircraft (i.e. just one prop on the nose, no turbines, APUs or other engines) - how big (and how fast) would the propeller have to be ...
1 vote
2 answers
2k views

How diesel fuel is injected into the cylinder of a diesel engine?

I am wondering how is diesel fuel injected into the cylinder of a diesel engine. Despite the difficulties of detonation, I think maybe a gradual injection of fuel during the power stroke will be ...
-1 votes
1 answer
272 views

How would a GE9X's react to ingesting a person?

Was wondering how a GE9X (or GE90/etc.) would fare after ingesting a person, at takeoff or climb thrust. (For a story.) Obviously the person is dead and the engine can safely be assumed to be a write ...
0 votes
1 answer
153 views

twist correction of fan blades

How can the blade's angle be effectively adjusted to meet prescribed tolerances during shop repairs? I am conducting a research paper on aircraft engine blade maintenance, and I have encountered ...
0 votes
0 answers
142 views

How do "thrust rating limits" work on the A320?

On page 11 of this A320 FCOM (power plant section only), a "thrust rating limit" mechanism is described. However, it doesn't go into much detail, and I could find little other information ...
3 votes
2 answers
342 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 ...
1 vote
0 answers
81 views

Engine Performance Data for GE F414-400

I am currently in Capstone for ASE, and for our course we have been tasked with reverse engineering the X-59 QueSST created by NASA and Lockheed Martin. I am the propulsion lead for our team and I ...
0 votes
1 answer
96 views

Manifold Pressure System

Hi to all. I read about how MAP works and have a question. Do constant speed planes like the c182 or pa44 have an additional Venturi (apart from the one in the carburetor) in the induction system past ...
3 votes
1 answer
339 views

PA28 Archer 2 Circa 1986 - Noisy Engine

100 hours ago, a group-owned PA28 Archer II Circa 1986, 180hp plane had its engine rebuilt after 2500 hours. There had been no problems with the aircraft during the 2500 hours. Since the rebuild, the ...
1 vote
1 answer
472 views

Minimum HP for ultralight

What is the minimum HP needed to fly a 200 pound ultralight? I’m looking at a 6.5 HP, 3600 RPM Predator engine, but is that enough?
0 votes
0 answers
40 views

If you could put multiple smaller ejector pumps in the same space, would it work better than one larger ejector pump?

I saw somewhere how, for Dyson bladeless fan systems to work for hovering, you'd need an entire grate of ejectors rather than a single ring. However, if you had five ejectors in the same space, each a ...
2 votes
2 answers
415 views

How is a turboprop engine mounted to the wing?

For a given turboprop plane such as the ATR-72, there doesn't seem to be a pylon as on turbofan driven planes. This question: How are engines mounted onto wings? has answers that detail how a pylon is ...
3 votes
3 answers
348 views

Is it possible to identify plane engines by sound alone?

Can airplane engines be differentiated and identified by what noises they make? If so, what does each engine sound like? How would you be able to tell between a low-bypass and high-bypass turbofan? ...
8 votes
1 answer
1k views

777-300ER venting something from left engine outboard side - what is it?

Crossposting from Metabunk with permission from the thread opener marko.posavec. Their photo shows British Airways Boeing 777-300ER G-STBF in flight with something producing a contrail or the like ...
1 vote
1 answer
332 views

Why some airliners have autostart and others don't?

So some of the more modern FADEC equiped planes (specifically airliners like the 787) have autostart and will self monitor the engines during startup. The one thing that confused me was how a 747 ...
1 vote
1 answer
664 views

Does any engine combine an air-breathing rocket and a non-air-breathing rocket?

Does any rocket engine combine air-breathing and non-air-breathing modes? The advantage would be it would have to carry a smaller tank and less oxygen, leaving more room for payload on a weight basis.
5 votes
1 answer
261 views

Need help identifying a radial aircraft engine

I work at the Naval Air Station Wildwood Aviation Museum in Rio Grande NJ. We just acquired what we believe to be a radial aircraft engine that was found by fisherman in the Atlantic Ocean. We'd ...
30 votes
4 answers
13k views

How does a coaxial rotor helicopter achieve yaw?

Without a tail rotor, how does a coaxial rotor helicopter achieve yaw control? Does a coax have to bank in order to turn? The link goes to wikipedia's article, and down a ways it says: Rotational ...
43 votes
2 answers
20k views

Why does afterburner exhaust have "pulses"?

Instead of being consistently-dense, the afterburner exhaust looks "pulsed" in these pictures below. Is this a trick of the camera, a natural result of interaction with the air, or is there ...
2 votes
1 answer
180 views

Actual non-axial airflow (sideslip) for a propeller driven aircraft

I am making a propeller model for a two-engine propeller driven aircraft (like a Dornier 228). I have expanded my model to include the non-axial airflow as well. $$ $$ By non axial airflow, I mean ...
3 votes
2 answers
803 views

How are the compressor and turbine disks connected?

What is the typical way the compressor and turbine disks connected to (LP/HP) shaft ? How are the disks connected to each other (e.g., curvic coupling, bolts or others ?)
1 vote
1 answer
107 views

Authorization of repairing engine blade nicks

Since blade nicks repair considered as a major repair, I would like to ask, 1- Who is authorized to repair engine blade nicks? 2- Could a mechanic with powerplant rating do the repair? 3- Could a ...
7 votes
5 answers
3k views

Could bypass air be used to cool a rocket engine like in turbofans?

Rocket engines typically employ a cooling jacket of sorts, usually dual-purposing the fuel as a liquid coolant before it flows into the injectors. Here is an example turbojet using a bypass. As you ...
4 votes
2 answers
569 views

Could a F-22's exhaust stall a highjacked Boeing 767's turbofan(s) and force it to land?

Would it be possible to use a F-22's exhaust to intentionally stall a hijacked Boeing 767's turbofan engines in order to force it to land instead of shooting it down? The idea being that stalling one ...
-4 votes
2 answers
181 views

Is diying a strong jet engine possible wih basic tools

Is it possible to manufacture a jet engine that provides 500 newtons of thrust with relatively primitive tools like a lathe or so , if someone did something similar can you provide me with the ...
11 votes
1 answer
5k views

What is a heat dissipater and how does it work?

Wikipedia's Mi-24 Hind article (a Soviet helictoper) says: Heat dissipaters were also fitted to exhausts to decrease the Mi-24's heat signature. There's no citation. What exactly is a heat ...
3 votes
3 answers
740 views

How to calculate sfc per throttle setting of an turbofan engine?

I was looking for sfc per throttle setting of an engine. I was not getting the performance data of that engine. So is there any way to calculate it by formula?
1 vote
0 answers
141 views

Why are hydraulic pumps mounted on engines 2 and 3 in BAe 146?

The BAe 146 has 4 engines: engine no. 1 and 4 generate electricity engine no. 2 and 3 generate hydraulic pressure Why was this setup chosen?
9 votes
1 answer
780 views

Why is the forward fairing of the pylon very shiny and metallic in appearance in A350?

One can notice the forward fairing of pylon is very shiny and metallic. This is quite unique and I do not find it in other aircraft. Why is this? Does it serve any specific aerodynamic purpose or does ...
5 votes
4 answers
723 views

Would the combustion chambers of a turbine engine generate any thrust by itself? [duplicate]

Well, I know that the combustion chambers drive the compressors, and the reaction occurs, and all that stuff. But let's imagine that somehow someone is converting a turbine engine (turbojet, turboprop,...

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