Questions tagged [engine]
For general questions related to aircraft engines; use the [jet-engine] or [piston-engine] tag if possible.
305
questions
2
votes
1answer
94 views
Does a lean mixture result in a higher cylinder temperature for a given power setting?
From what I know over rich mixture help cools the engine due to evaporation process and lean mixture do the opposite.
So why this graph showing when reaching around peak EGT the opposite happens:
21
votes
1answer
5k views
What's wrong in this engine test cell picture from the book 'Ignition'?
This is picture taken from 'Ignition' book by John D Clarke.
I am bewildered after seeing picture that I can't find wrong in this picture. I guess this is related to the structure of mach ...
5
votes
1answer
78 views
What is ATR Automatic Thrust Restoration in MD-83?
What is ATR Automatic Thrust Restoration in MD-83 ?
2
votes
1answer
133 views
Manifold pressure vs power vs rpm
From what I know MAP is a way of measuring engine power with variable pitch propeller. Greater throttle setting - greater power - greater MAP on the gauge. It happens because MAP is in fact vacum ...
0
votes
2answers
334 views
Does an engine that combines an air-breathing rocket and non-air-breathing rocket exist?
Does a rocket engine that combines air-breathing and non-air-breathing modes exist?
The advantage would be it would have to carry a smaller tank and less oxygen, leaving more room for payload on a ...
3
votes
1answer
269 views
What are the CONT and FLT modes of the 737 start switches?
I pilot the PMDG 737 in my simulator and I know that before takeoff and before landing, the start switches must be set to CONT mode and at high altitudes in FLT mode. But what exactly are CONT and FLT ...
4
votes
5answers
335 views
Can you fly 2000 miles on an engine that costs less than $500k? If so, what type of engine?
Ok so Im exploring ways to bring cargo and medical supplies to various rural cities in say Africa without relying on ground infrastructure. Just short and cheap runways spread around the continent. It ...
-5
votes
2answers
113 views
Is a 3 horsepower engine powerful enough for a 100 pound ultralight? [duplicate]
I'm building an ultralight and it weighs 100 pounds empty. My only engine is 3HP. Is that good enough?
18
votes
2answers
3k views
What are the most powerful airplanes that ever flew?
This question What are the least powerful airplanes that ever flew? made me wonder what the most powerful manned airplanes are that ever flew. There are two sensible categories, I suppose:
Most ...
22
votes
6answers
6k views
What are the least powerful airplanes that ever flew?
What manned airplanes have achieved flight with the least powerful engines (no gliders!), and what was their top speed? Im sure I've heard of an airplane with an 8hp engine capable of exceeding 120 ...
0
votes
0answers
52 views
How is the A320neo engine different from the A320ceo engine?
I've looked up at internet about the differences. And the only difference they mention is that the new engine has a higher bypass ratio (making it more fuel efficient), quieter and has an improved ...
10
votes
3answers
4k 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 ...
3
votes
1answer
112 views
Why is the inlet cone shaped conical?
Why are inlet cones of a lot of aircrafts conical. I read that it has something to do with slowing down supersonic airflow entering inside the engine. Is this true? If so, can somebody please ...
7
votes
1answer
196 views
What does VIB stand for in EICAS?
From what I know it’s measuring engine vibrations? What do the numbers actually mean? For example, 1.9 VIB:
1
vote
0answers
124 views
4
votes
1answer
168 views
Why can’t the F28 be deiced with one or both engines running?
Recently, I was contemplating Air Ontario Flight 1363, which, despite heavy, wet snowfall while it was on the ground at CYHD, could not be deiced before takeoff, as it arrived bearing an inoperative ...
0
votes
1answer
61 views
Why did Avianca have A318s with PW6000 engine?
I want to know about the upgraded PW6000 Avianca A318s. Why did those get upgraded? Did they not produce enough thrust already?
4
votes
2answers
280 views
What turbine blade alloy did the Jendrassik Cs-1 use?
Wikipedia says that the first turboprop aircraft engine was the Jendrassik Cs-1 invented in Hungary by György Jendrassik.
It says it was supposed to run at 1000 hp but "combustion problems" limited ...
3
votes
2answers
318 views
When evacuating after a rejected takeoff, what is the minimum distance you should be from the plane and which direction should you run?
In case of a rejected takeoff, and due to a malfunction or engine explosion, how far do you have to distance yourself from the plane and in which direction would you run towards?
In my opinion (...
0
votes
1answer
245 views
Will an axial compressor work with an ideal fluid?
Will an axial compressor, like the one described starting on page 275 of Mechanics and Thermodyanmics (PDF link), work if the flow was assumed to be ideal (i.e. incompressible and inviscid)?
...
1
vote
2answers
119 views
Does counter-rotating propellers on multi engine airplanes have critical engine?
I read from most of the article and books that counter-rotating propellers multi engine airplanes do not have critical engine, but it just happened to my friend who did his Commercial Multi Engine ...
3
votes
0answers
55 views
What are the differences between a compressor wash on wing vs on test bed
I work in an aircraft engine overhaul facility and I’m trying to understand the process of compressor washing engines on Wing compared to washing them in a test bed. What process steps are different ...
2
votes
3answers
271 views
What is the reason for this engine oil service procedure on a Bombardier CRJ?
Someone told me that servicing the engine oil on a Bombardier CRJ900 aircraft with the APU on could lead to the particular engine being overserviced. He then advised that the engine-oil service be ...
25
votes
5answers
9k views
What is the rationale for single engine military aircraft?
In aeronautics, redundancy is of primary concern. Having at least two engines is common for civilian aircraft. I expect the military to have at least the same level of redundancy. Moreover military ...
-2
votes
2answers
215 views
What engine should I use for a home-built ultralight (That is rideable) [closed]
I am looking for an engine that is powerful + cheap engine that will work in an ultralight aircraft and fly 1 person as well as the plane. yeah, this is kinda specific, but I have a tight budget and ...
1
vote
4answers
195 views
Can i create a home built aircraft with this engine?
http://www.chiefaircraft.com/da-100.html
Would this engine work for a homebuilt ultralight aircraft? I am still in the research phase, so i don't know what the weight of the aircraft will be, but I ...
2
votes
1answer
111 views
Are the “centerbody”, “fan hub frame”, and “intermediate case” all the same thing or separate parts?
I'm curious about the frames & cases at the front of an engine. I've seen OEMs call them the centerbody, fan hub frame, and intermediate case. Are these all the same thing or are these each a ...
2
votes
1answer
80 views
Is there an equation for jet engine efficiency as a function of turbine inlet temperature?
I know that there is a relation between the turbine inlet temperature and the engine's efficiency. But, can anyone provide an equation or efficiency as a function of just the turbine inlet temperature?...
0
votes
0answers
63 views
Where can PT-6 engine series starter-Generator diagrams be found?
Wondering if anyone can direct me to the spec sheet, diagrams, and breakdowns of a typical Starter-Generator for a PT-6, say a PT6-66 series or similar. And also who are the major manufacturers of ...
0
votes
1answer
141 views
Dual Ignition Systems
Is it possible to back up a single magneto ignition system using an electronic system on the same spark plugs rather than having to change to two plg heads?
2
votes
1answer
202 views
What is the main difference between 'continental fuel injection system' and 'Bendix RSA fuel injection system'?
While I'm studying Aircraft Engine system, I learned that there are two dominant kinds of fuel injection system : 'continental fuel injection system' and 'Bendix RSA fuel injection system'
I tried to ...
1
vote
1answer
135 views
What is nominal n1 and fuel flow behavior during cruise climb?
For a commuter airliner (e.g. 737) performing a cruise climb (step climb) at a constant Mach, how should n1 and fuel flow behave?
I know that fuel flow should decrease with altitude (air fuel ratio).
...
2
votes
1answer
118 views
Which is better: a rotor / prop followed by a stator, or contra rotating rotors / props?
It is all in the title.
I'm interested in power absorbed/used for a given thrust, or thrust generated for a given power (same diameters of course).
Just thrust and power. Ignore materials, electric ...
0
votes
0answers
80 views
Why are some exhaust cone exposed?
Some engines have an exposed tail/exhaust cone at their exit, protruding aft the nozzle.
how does that affect the overall thrust and pressure distribution along the walls of the cone?
is it's role ...
3
votes
1answer
358 views
Which engines do airliners start first?
I noticed many planes, especially Boeings (correct me if I'm wrong anywhere), start engine "2" first and shut down engine "2" last.
However, I was watching an Airbus A350 cockpit video when I ...
2
votes
0answers
44 views
Are subsonic nozzle fully expanded?
this is about converging subsonic nozzles.
Are they fully expanded? meaning exit pressure=ambient pressure?
What about diverging subsonic nozzle?
Are they fully expanded? what would happen if the ...
2
votes
1answer
166 views
Why Apollo 11 was launched in summer? (Performance question) [closed]
The question could seems stupid, but i think that best moment to launch a rocket is when temperature is lowest in order to achieve the best performance in a reaction engine. I do not know if there is ...
16
votes
4answers
6k views
Is it allowed to let the engine of an aircraft idle without a pilot in the plane. (For both helicopters and aeroplanes)
Is it allowed to let the engine of an aircraft idle without a pilot in the plane. (For both helicopters and aircr).
Would there be a difference between a C172 and a 737?
4
votes
2answers
94 views
How can the effects of hot corrosion and salt deposits from sea water spray in gas turbine engines be negated/prevented?
In aircraft operating in a maritime environment, corrosive effects from salt water are common. Are there any specific coatings used in engines for such aircraft? If so, which are they? How frequently ...
8
votes
2answers
379 views
What are the durations of strokes and events in a 4-stroke engine?
I'm learning about engines, and I understand the basics of how a 4-stroke engine works, but I've seen lots of true or false questions such as "The power stroke is shorter than the intake stroke" or "...
2
votes
1answer
156 views
Are four-engined airplanes calibrated to put out the same thrust for both their inner and outer engines?
Is there a slight difference baked into the aircraft's throttle control systems or are they always pumping out the exact same thrust as each other?
31
votes
2answers
8k views
What is the significance of 104% for throttle power and rotor speed?
I noticed this initially when learning to fly Robinson Helicopters but fail to remember the reason my instructor gave me; this again came up when watching a video about the ISS.
In helicopters (...
3
votes
1answer
230 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 ...
1
vote
0answers
71 views
What Microcontroller(s) is/are used inside the ECU of a CF6-80C2 engine?
The question came up at work today and no one knew the answer. Did some digging online and could not find anything definitive.
1
vote
1answer
148 views
How could a turbocharger experience over-boosting due to cold oil?
How can cold oil cause a turbocharged engine's automatic waste gate to stick, leading to over-boosting?
Diagrams I've found online for waste gates don't appear to indicate a connection between it and ...
4
votes
0answers
53 views
Engine rear nozzle outside vs inside [duplicate]
I'm not sure if it's called nozzle or something else. I'm talking about the cone shaped part of GA engines at the rear.
Older engines, for example this Trent 700 had the cowling covering whole of the ...
0
votes
3answers
109 views
On a axial flow turbo fan or turbo jet engine what comes first the rotor or the stator?
I've been let to understand that one stage consists of a row of rotors and stators. But I'm not sure which comes first? Does the front fan blades make the first part of the stage (rotor) with a stator ...
1
vote
0answers
57 views
When are pressure-swirl atomizers and airblast atomizers used?
I am a little confused as to when (during T/O, cruise, etc.) and how the combined pressure-swirl atomizer and airblast atomizer is used.
Lefebvre writes that "the merits of the pressure-swirl ...
6
votes
1answer
655 views
Does the mixture and throttle setting affect the quality of priming of fuel prior to start?
This question is a generality. For airplanes with small reciprocating engines, does the mixture and throttle setting at the time of priming affect the quality of the priming or the engine start, or ...
0
votes
3answers
107 views
How does thrust relate to horsepower on turbocharged engines?
Could someone please help me understand the difference between horsepower and thrust on turbocharged engines? I believe I have a good understanding regarding the purpose and operation of a ...
