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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 answers
542 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 ...
EEE's user avatar
  • 7
2 votes
1 answer
658 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 ...
Jim12's user avatar
  • 21
2 votes
1 answer
482 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?...
mani shekar's user avatar
0 votes
0 answers
198 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 ...
Hercules-63's user avatar
0 votes
1 answer
449 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?
Dick Skinner's user avatar
4 votes
1 answer
9k 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 ...
Student412's user avatar
1 vote
1 answer
3k 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). ...
mdamkani's user avatar
  • 123
3 votes
1 answer
243 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 ...
toshi ba's user avatar
  • 411
0 votes
0 answers
228 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 ...
toshi ba's user avatar
  • 411
4 votes
2 answers
3k 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 ...
Caden Yeo's user avatar
2 votes
0 answers
263 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 ...
toshi ba's user avatar
  • 411
2 votes
1 answer
178 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 ...
Miguel Hernández's user avatar
16 votes
4 answers
7k 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?
user19440's user avatar
  • 1,075
4 votes
2 answers
238 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 ...
Marc's user avatar
  • 41
8 votes
2 answers
4k 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 "...
user43890's user avatar
2 votes
1 answer
188 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?
minijet88's user avatar
  • 151
31 votes
2 answers
9k 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 (...
Matt Clark's user avatar
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 ...
user avatar
1 vote
0 answers
107 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.
belza00's user avatar
  • 11
1 vote
1 answer
668 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 ...
Ryan Mortensen's user avatar
4 votes
0 answers
69 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 ...
Harshil Sharma's user avatar
2 votes
3 answers
1k 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 ...
Jono 's user avatar
  • 608
1 vote
0 answers
114 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 ...
Hypatie D'Alexandrie's user avatar
8 votes
1 answer
1k 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 ...
Ryan Mortensen's user avatar
0 votes
3 answers
261 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 ...
MrJoeHimself's user avatar
2 votes
1 answer
500 views

Why can’t electric motors be used in aviation [duplicate]

Why can’t electric motors be used in aviation? Is it a problem with batteries, torque, or what? From what I’m aware motors at high torque are expensive and need a massive footprint, than a high rpm ...
Useruuu's user avatar
  • 341
0 votes
1 answer
984 views

PT-6 Starting problems - PT6A - 67B, installed on a PC12

we are having trouble starting our PC12. After introducing fuel at stabilized 13% ng, the engine spools up very slowly - it takes forever to get through 20, 30, 40%ng. We've had several hung starts, ...
fax ayres's user avatar
1 vote
2 answers
593 views

How to measure thrust produced from combustion chamber of Gas Turbine Engine?

I'm conduction a scale model experiment of thrust production in combustion chamber by using different types of fuel source. Comparing the thrust produced by using hydrogen gas, kerosene and petrol. ...
cat's user avatar
  • 402
1 vote
1 answer
484 views

What materials are used in a Rolls-Royce RB211-524 Engine?

I am trying to know what materials (Specifically metals) are used in making a Rolls-Royce RB211-524 Engine. I already found what is used in engines in general, but is it the same for all? And if so, ...
Sanad's user avatar
  • 13
0 votes
1 answer
800 views

Any unique characteristics to identify aircraft engine? [closed]

I love to find out the engine manufacturer and make, used in all of the aircraft I fly. Can anyone provide hints on how to identify an engine uniquely? The CFM56 on a Boeing 737NG is easy. It has a ...
SamwellTarly's user avatar
2 votes
2 answers
5k views

Is overall pressure ratio same as compressor pressure ratio for a gas turbine engine?

For a typical gas turbine engine, turbofan in particular, is the compressor pressure ratio same as the overall pressure ratio? For modelling purposes can we use the same value of overall pressure ...
smrithi s's user avatar
6 votes
2 answers
8k views

What is the difference between BHP (brake horsepower) and HP (horsepower)?

So far as I know, brake horsepower (BHP) and horsepower (HP) are the same. But some books tell me that the two concepts are totally different. What is the difference between BHP and HP?
Mun Park's user avatar
  • 497
4 votes
3 answers
10k views

How can a pilot deal with a magneto failure?

As I know, the engine is independent from the electrical system, and it is supplied from magnetos. However, how can a pilot deal with a magneto failure? And also, when one magneto fails what problems ...
Mun Park's user avatar
  • 497
1 vote
1 answer
82 views

Proportionally, what is more affected by a hot and high takeoff - a electrically driven propeller or a turbofan?

My assumption would be the electrically driven propeller would be less affected compared to turbofans at high altitudes and take off as although the air would be less dense at these ambient conditions,...
Geoffry's user avatar
  • 11
-2 votes
2 answers
442 views

Why Engine Exhaust Nozzle can not be totally buried in aircraft fuselage? [closed]

Why The CD nozzles of the fighter aircraft are always outside the fuselage, Why the whole engine is not buried in the fuselage?? If engine shroud also can be made variable area and varies with CD ...
Ashish Bhatt's user avatar
4 votes
1 answer
674 views

Are low pressure (LP) compressors and booster compressors the same thing?

Based on the above picture, are "LP compressor" and "Booster compressor" different names for the same thing or are they actually different things?
sherline lin's user avatar
4 votes
1 answer
411 views

Are all engines fan blades made out of titanium?

I was wondering if all engine fan blades are really made out of titanium.
Miyo Hazuki's user avatar
16 votes
9 answers
8k views

Can hydrogen gas be an alternative fuel source for a gas turbine engine?

I want to do research for an alternative fuel source for a commercial aircraft that will reduce the cost for flights. Will the hydrogen gas be ignited in the combustion chamber and produce enough ...
cat's user avatar
  • 402
-1 votes
1 answer
3k views

Hydromechanical/Electronic fuel control system [closed]

Can someone explain the picture below which represents hydromechanical/electronic fuel control? What's the function of the solenoid on the picture below? What are the differences between solely ...
Darjan's user avatar
  • 1,157
2 votes
2 answers
512 views

Is the Meredith effect utilized in the cowling design of air-cooled engines?

The P-51 is famous for its advanced-for-its-time aerodynamics, the prime example of which is the radiator design under the belly which utilizes the Meredith effect to, in effect, turn it into a mini ...
Meatball Princess's user avatar
2 votes
1 answer
372 views

How much does the swirl of engine exhaust affect aircraft performance?

Most multi-engine aircraft have engines that rotate the same direction on both sides of the fuselage (e.g. the GEnx rotates clockwise, as viewed from the front, there is no 'mirrored' version). What ...
costrom's user avatar
  • 278
2 votes
1 answer
578 views

Would a de-aerating fuel tank have any benefits?

I know turbine engines (bearings) are cooled by oil jets and that when oil is scavenged from the bearings it is more of a mist than a liquid, hence the need for various types of de-aerating this mist ...
Meatball Princess's user avatar
3 votes
1 answer
889 views

What is the standard for tachometer calibration / Hobb's equivalency?

I've heard that 1 tach hour = 1 Hobb's hour at maximum RPM. I've also heard that tach equivalency is at "cruise" RPM, although that seems vague. I believe I've also heard that the accuracy of ...
Zaz's user avatar
  • 1,569
0 votes
1 answer
816 views

Why do pilots typically start out in piston-engined aircraft, rather than jets or turboprops? [duplicate]

Essentially all pilots begin flying with propeller aircraft powered by piston engines, rather than in turboprops or light jets, even though: Operating a piston engine requires adjusting the mixture ...
Vikki's user avatar
  • 28.4k
5 votes
1 answer
1k views

Why don't air-cooled radial engines use fuel to cool the oil?

Having read up on WWII air-cooled radials, one thing that struck me is how frequent is the mentioning of external oil cooler overheating, or the need for armored boxes around it, and some even venture ...
Meatball Princess's user avatar
0 votes
0 answers
78 views

What % of horsepower in a turbine is used by the compressor section? [duplicate]

If a turbine generates 10,000 shaft horsepower, I am trying to understand how much horsepower has been used to compress the air. So the turbine that generates 10,000 hp must in fact generate 10,000 ...
chemimagineer's user avatar
10 votes
4 answers
4k views

Is the bleed air passengers breathe tapped from the engines before or after it comes in contact with fuel? And why? Isn't this unhealthy?

Passengers are often surprised to hear that the air they breathe comes from inside the engines. This sounds unhealthy. Can you explain, why it is not ? Is bleed air tapped (for cabin pressurization) ...
summerrain's user avatar
  • 3,474
1 vote
2 answers
1k views

Asymmetric thrust [closed]

Let's assume we lose left engine on a twin-engine aircraft during a straight and level flight without a side slip. In order to compensate yawing moment to the left from the right engine we deflect the ...
Julious's user avatar
  • 39
0 votes
5 answers
2k views

I wonder if it's possible to make a "compressed air" turbine engine [closed]

I wonder if it's possible to make an efficient turbine engine that uses only hot compressed air to move but only that, meaning there is no ignition involved. To put it simple can we use compressors ...
anton siro's user avatar
1 vote
2 answers
1k views

How many hours to remove and install a Cherokee 180 engine and prop

How many hours should it take a shop to remove, install, and adjust the engine in a Cherokee 180 with a fixed pitch prop? This would include the baffles and any hardware needed to be removed and ...
user35743's user avatar

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