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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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4 votes
4 answers
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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 ...
mandiokai's user avatar
  • 620
0 votes
4 answers
289 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? ...
Sambhav Khandelwal's user avatar
1 vote
1 answer
99 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 ...
MaddyTEX's user avatar
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 ...
Gabe's user avatar
  • 3,217
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 ...
ChipperCorgi's user avatar
0 votes
0 answers
28 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
almohndis's user avatar
2 votes
1 answer
206 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 ...
aham_brahmasmi's user avatar
0 votes
5 answers
316 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 ...
aleks lacroix's user avatar
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 ...
Cloud's user avatar
  • 13.5k
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 ...
AIRWAYLOVER's user avatar
-1 votes
1 answer
268 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 ...
CSEverett's user avatar
0 votes
0 answers
128 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 ...
331821's user avatar
  • 133
1 vote
0 answers
73 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 ...
Derrick John's user avatar
3 votes
2 answers
334 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 ...
Vinicius Quintela's user avatar
3 votes
1 answer
392 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 ...
Breaach's user avatar
  • 159
0 votes
1 answer
88 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 ...
Breaach's user avatar
  • 159
1 vote
1 answer
394 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?
Tar Emosewa's user avatar
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 ...
Geoffrey Williams's user avatar
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 ...
John B's user avatar
  • 31
2 votes
2 answers
374 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 ...
keg504's user avatar
  • 23
3 votes
3 answers
329 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? ...
Mateo's user avatar
  • 746
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 ...
Cpt Reynolds's user avatar
  • 4,807
1 vote
1 answer
320 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 ...
Boeing787's user avatar
  • 6,454
5 votes
1 answer
247 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 ...
Chet Rietheimer's user avatar
2 votes
1 answer
178 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 ...
Neelabh Jyoti Saharia's user avatar
1 vote
1 answer
106 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 ...
Mohammed Barashi's user avatar
0 votes
1 answer
152 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 ...
ken ken's user avatar
-4 votes
2 answers
163 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 ...
Ahmed Radwan's user avatar
1 vote
0 answers
138 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?
Aviator's user avatar
  • 11
3 votes
3 answers
724 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?
Eaza's user avatar
  • 121
5 votes
4 answers
717 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,...
Fulano's user avatar
  • 121
16 votes
4 answers
6k views

Why use a RAT when engines can windmill?

When a dual engine flame-out is encountered, and the engines themselves are not damaged such as in the case of Air Transat Flight 236, why is the RAT deployed for emergency power instead of using the ...
natanijelvasic's user avatar
8 votes
2 answers
911 views

Where exactly is the engine compartment, remarked in yellow?

Where exactly is the engine compartment, remarked in yellow? We know that normally the air going to the engine passes through the air filter. But when we open the alternate air valve, where does the ...
pilot162's user avatar
  • 2,205
9 votes
10 answers
7k views

Can an aircraft use ram air to generate power while flying?

I am a student carrying out a project focused on efficiency on aircraft. I have arrived at an idea I believe to be feasible. I am looking for suggestions, specification of what I would need, and any ...
Max Cremona's user avatar
11 votes
5 answers
3k views

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 ...
cTen's user avatar
  • 111
1 vote
1 answer
304 views

Why does true airspeed decrease with altitude?

I was having a discussion with a friend who's going for a record speed over distance attempt. We were discussing which altitude will have the fastest TAS, and I suggested it would be the highest ...
Kenn Sebesta's user avatar
  • 5,142
6 votes
5 answers
6k views

Does a 120cc engine burn 120cc of fuel a minute?

I have heard that a 120cc engine burns 120cc or 120ml of fuel per minute. Is this true?
Lelotz's user avatar
  • 127
1 vote
0 answers
99 views

Would the dle 55ra engine be enough to power my paramotor(ducted fan)?

I plan on using the dle 55ra engine to produce 5hp at 8,500 rpm. I am using it in a paramotor, and to save space I am considering using a ducted propeller similar to the Fulcrum power pod. The duct ...
Lelotz's user avatar
  • 127
3 votes
1 answer
963 views

Why does airspeed increase with more throttle if RPM stays the same?

Given a constant speed propeller, the RPM will stay the same because of the governing system which changes the blade angle. But in cruise flight if you add more power and keep the RPM's the same, ...
RattMuscle's user avatar
0 votes
1 answer
105 views

How do Pistons vs. Turbines fare during a Carrington event?

Electromagnetic pulses are a staple in sci-fi, and they're basically the writers' hand-waving of "deletes technology" weapons. This question asks about whether or not GA motors would ...
William Walker III's user avatar
0 votes
1 answer
485 views

What airfoil family does turbofan's fan blades use?

The thing is, I am trying to make turbofan blades in Solidworks for a possible undergraduate thesis. I want to know if there is any airfoil from the NACA series or any airfoil families plausible for ...
Paul P.'s user avatar
  • 21
0 votes
0 answers
120 views

What is the amount of bleed air required for de-icing? What is the power impact of this bleed air?

I was wondering if anybody has any rough equations/figures that answer the following questions. What is the mass/flow rate of bleed air required for de-icing based on temperature of the air intake? ...
Liam's user avatar
  • 1
9 votes
1 answer
764 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 ...
karthikeyan's user avatar
3 votes
1 answer
190 views

What is the aerodynamic influence of prop spacing and placement in multi-prop engine setups

I saw this question Is there a rule of thumb for spacing between jet engines?, which referred to How do you choose engine placement for under wings engines?, but I was wondering how the engine spacing ...
ROIMaison's user avatar
  • 7,367
4 votes
1 answer
251 views

Why are spins not allowed below 10k ft msl in the T6b?

Reading through the manual I see that spins are not allowed below 10000 msl in this turboprop aircraft, the t6b, the reason that is written in the manual is as follows, quote: "Spins below 10k ...
YamchaAviator's user avatar
0 votes
1 answer
635 views

Airspeed and RPM relationship with different attitudes

How can I figure out what airspeed goes with what rpm? I cannot find it in the POH. I read that for cruising attitude on a Cessna 152, we should aim for 2200 rpm. My plane is a PA-28-151. I am asking ...
ken's user avatar
  • 103
4 votes
2 answers
568 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 ...
Kim deDonado's user avatar
5 votes
5 answers
6k views

Can you put a propeller on the back of a plane, and have it go forward?

So, I was thinking about how drones work, and I can't figure out how drones with propellers at the rear of the drone can still go forward. I'm not that experienced in aviation so if this is a basic ...
floppa fan's user avatar
5 votes
2 answers
262 views

What is "FAR power"?

The article "Boeing’s MCAS on the 737 Max may not have been needed at all" (The Air Current, January 10, 2021) quotes a Boeing e-mail about the 737 MAX that says (emphasis mine), I can't ...
cjs's user avatar
  • 1,044
0 votes
0 answers
56 views

Safran 2S2 Engine Overhaul

Does overhaul of Safran 2S2 Engine reset all engine inspections? If engine TSO is 0 as of today, does it mean I can reset all 15/20/30/300/600/3000/3500 hours inspection to be 0? Or I have to see Shop ...
Bipin Patel's user avatar

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