Questions tagged [multi-engine]
Aircraft equipped with more than one engine.
4
votes
1answer
300 views
What is this four-engine propeller airplane?
I came across this print at a bargain store a couple weeks ago. At first I thought it might be a variant of a Lockheed L-188 Electra; then I noticed that it has at least 6 engines, as the print ...
1
vote
2answers
205 views
Why aren’t multiengine general-aviation aircraft required to be capable of sustained single-engine flight?
While perusing the See How it Flies website, I came across this alarming statement regarding multiengine general-aviation aircraft:
You must not allow yourself to think that just because airliners ...
0
votes
2answers
113 views
What is the correct go-around procedure in a PA-44?
I wanted some advice on a procedural-type question. In the PA-44 (Piper Seminole) go-around procedure, it is listed as follows:
MIXTURES ............................................FULL RICH
...
1
vote
1answer
143 views
What's the difference between the Multi Engine Instrument Rating and Instrument Rating in Canada?
Are the requirements for the Multi Engine Instrument Rating the same as Instrument Rating in Canada or is there a separate exam for each of them?
Thanks!
1
vote
2answers
272 views
In a Vmc demo, why is it important to lose 1 knot per second?
I got asked two questions on my checkride:
Why is it important to lose 1 knot per second (approximately) in a Vmc Demo?
How do we know we're losing 1 knot per second?
My answer to question 1 would ...
2
votes
4answers
296 views
How does setting takeoff flaps improve aircraft performance?
A study guide I recently found indicates that Vmc and aircraft performance improve with takeoff flaps set. The Vmc improvement makes sense but the performance improvement does not. At a basic level, ...
1
vote
2answers
213 views
Why do some multi-engine aircraft have accelerate-go distance in their performance charts and some don’t?
I'm curious about why some airplanes have accelerate-stop distance (ASD) and accelerate-go distance (AGD) in their performance charts and some don’t include that. Does anyone know why?
2
votes
2answers
353 views
Why isn't the application of “carb heat” in initial piston multi-engine failure emergency procedures?
What is the rationale for not including the application of carb heat in the initial multi-engine airplane's engine failure procedure?
I've recently starting flying light multi-engine airplanes again ...
1
vote
0answers
40 views
Is it possible to swap RR trent 900 engines to GP 7200 for existing A380 air frame? [duplicate]
If an A380 was originally equiped with RR trent 900 engines, but decided to switch to GP 7200 for any reason, would this be possible? Has this kind of engine swap (different manufacturer engine swap) ...
3
votes
1answer
196 views
if your Seneca weight is 4000 pounds , and you have 800m visibility, would you take off? [closed]
An examiner asked me if your Seneca weight is 4000 pounds , and you have 800m visibility, would you take off ?
I said by law the visibility is ok but still I would not because if we get an engine ...
1
vote
2answers
692 views
Why should a Piper Seneca not take off after an engine failure below 100MPH?
In the Seneca (PA34-200) AFM, in the ENGINE FAILURE DURING TAKEOFF section, it is noted that if engine failures occurs during takeoff ground roll and 100 MPH has not been attained, the pilot must ...
6
votes
1answer
17k views
What is the aircraft model used in the film “American Made”?
In American Made, what is the model of the white airplane that the CIA presents to Barry Seal (played by Tom Cruise)? He says something along the lines of "the fastest piston twin". Are those ...
10
votes
1answer
4k views
How does the range of a single- and twin-engine for small aircraft compare?
I know that one difference between these two types of small aircraft are that in a twin engine, one engine can continue working if the other suddenly fails.
Wouldn’t a single engine plane weigh less ...
8
votes
1answer
387 views
Does the DC-3 have a prop sync?
I'd like to ask if the DC-3 has a prop sync.
I found nothing about prop sync in the DC-3 operations manual, in the running specs, design features, or in the chapters about its engine and propeller. I'...
5
votes
1answer
447 views
How do the engines of a multi-engine airplane shut down after fuel starvation?
If a multi-engine aircraft runs out of fuel, can the engines flame out at different times due to fuel inequality between the tanks, or do they both die at the same time because fuel is constantly ...
3
votes
2answers
163 views
Are run-ups required for multiengine piston aircraft?
Are run-ups required or advisable on multiengine piston aircraft?
11
votes
6answers
12k views
How many four-engine commercial passenger jetliner types are currently in use?
Just heard following somewhere:
It is easy to distinguish four-engine passenger jetliner type, because there are only three of them:
if it has "hump" upper deck then it is Boeing 747,
if ...
1
vote
1answer
242 views
What would happen if multi engines operated symmetrically?
What would happen if a multi engine operated symmetrically? So if one engine were to rotate counter-clockwise and the other clockwise. What are the advantages and downsides to this?
1
vote
1answer
391 views
1
vote
1answer
418 views
Is there a difference in aerodynamic efficiency between single engine and twin engine airplanes?
I've learned a lot of great information about aviation on this website. One insight I learned from a poster here is that, all else equal, for every doubling of engine power that you give an airplane, ...
19
votes
2answers
5k views
Taxiing with one engine: Is engine #1 always used or do they switch?
I recently travelled with an A320 and an A321 from FRA (Frankfurt) to TXL (Berlin) and back again. On this and on previous flights I already noticed a whining sound, much louder than other sounds, ...
4
votes
1answer
791 views
Why do jet planes with multiple engines have separate throttle levers for each engine?
What are the reasons to not just use one throttle lever for all engines?
5
votes
1answer
684 views
Why would aircraft engines be mounted with “toe out”?
According to Wikipedia, on the Douglas DC-4E...
[...] the four 1,450 hp (1,080 kW) Pratt & Whitney R-2180-A Twin Hornet 14-cylinder radials were all mounted with noticeable toe-out, ...
3
votes
1answer
338 views
Rotation direction for adjacent propellers, how do different arrangements compare?
(YouTube)
The Airbus A400M uses counter-rotating pairs where the blades meet moving downward (if there is a better description, tell me please).
I played the video frame-by-frame to make sure it ...
17
votes
3answers
3k views
In which direction should a turn-back be made after an engine failure on a multi engined airplane after take off?
In case one of the engines fails after taking off (let's suppose the left engine is the one that fails), which direction should we turn to go back to the airport? A left or a right traffic pattern?
1
vote
2answers
152 views
How do different training paths to multi-engine rating compare?
I am going to be initiating my private pilot license shortly and wanted some feedback and comments with regards to utilizing single engine (minimum) and multi-engine to obtain my multi-engine rating ...
0
votes
0answers
278 views
How to calculate optimal prop diameter, pitch, torque and power coefficient given required thrust?
this is my first post here, so bear with me if this isn't the right place. I'm coming here from Stack Overflow, and this seemed to be the most relevant Stack Exchange for my question.
So, I'm ...
5
votes
2answers
1k views
How does the safety record of the twin piston Diamond DA-42 compare to the single piston DA-40?
Its fairly well known that the Diamond DA-40 has one of the smallest fatality rates of any GA plane. The Diamond DA-42 is a twin engine aircraft with a very similar design to the DA-40.
Now, it has ...
7
votes
1answer
867 views
Can the four-engined Lockheed JetStar II fly on one engine?
As we know, there are no four-engined business/private jets currently in production. Some Dassault Falcon models are actually trijets, but this is not the case. The only four-engined business jet in ...
10
votes
1answer
3k views
How are redundant twin engines coupled on a helicopter?
I understand that a Eurocopter EC135 can fly on only 1 engine.
In this instance, is the dead engine power turbine still coupled to the rotor? Does it freewheel? Is there a clutch to disengage it? If ...
13
votes
2answers
1k views
Why isn't there a procedure for dual-engine failure in twin-engine airplanes?
I'm licensed to fly multi-engine aircraft. I currently fly the DA-42NG.
However, nowhere in my training and in the official POH was I introduced to procedures for handing a dual-engine failure in-...
15
votes
2answers
329 views
On commercial jets, is asymmetric thrust used as part of normal operations?
I know that when manoeuvring on the ground, asymmetric thrust is often used, for example to assist in turns when taxiing.
Are there other circumstances in normal operations which might call for the ...
9
votes
1answer
546 views
Has the wrong engine ever been mounted after maintenance?
Keeping in mind that a plane can fly with different engine models (e.g. for test purposes), has an error ever happened during normal operations that led to the wrong engine being mounted? Is some kind ...
5
votes
1answer
375 views
What are the visual differences between Trent 892 and 900 engines?
Are there any visual differences between a Trent 892 and a Trent 900 engine?
Particularly referring to the ones mounted on the 777-200.
5
votes
2answers
1k views
Is the twin vs quad engine industry preference really challenged?
This question relates to this article at Leeham, essentially this article challenges the concept that twin engined airliners are more efficient than quad engined. However the article fails to show the ...
23
votes
2answers
4k views
Why is rotating engines in opposite directions more important for a propeller-driven plane than a jet?
From here it is seen that many multi-engine propeller planes spin their propellers in opposite directions. To avoid producing "left" and "right" types of the engine, a gearbox is fitted.
In contrast,...
1
vote
3answers
984 views
Can an aeroplane ever be so far away from an airport that it cannot land? [duplicate]
Hypothetically, if an aeroplane with two engines is flying over the ocean and is far away from land, is it not quite likely (but still not very likely at all), that one engine fails and it cannot get ...
6
votes
1answer
2k views
Why are podded engines preferred over engines fitted inside the fuselage or wing?
Given the fact that podded engines on the wings of airplanes cause much drag (and thereby contribute to a lot of loss of efficiency), why do airliners still prefer podded turbojet engines over ...
25
votes
5answers
6k views
What is propeller / engine sync and how does it work?
In some models of multi-engine airplanes there is a switch labelled something similar to "prop sync" or "engine sync".
My questions are:
What is engine synchronization?
How is it achieved?
Why is it ...
5
votes
2answers
559 views
Why is an outward spinning propeller better in theory on the North American F-82 Twin Mustang?
In this question the Wikipedia article of the F-82 Twin Mustang is quoted. In the third paragraph of the article it says:
In this arrangement both propellers would turn upward as they approached ...
9
votes
1answer
1k views
Do airline pilots identify failed engines in the same way as light aircraft pilots?
Do the two old adages of light multi-engine flying, namely "Dead foot, dead engine" and "Raise the dead", still apply when flying transport-category aircraft? Or do airline pilots need to rely on ...
17
votes
4answers
8k views
What is a Vmc roll?
Many aviation discussions of the TransAsia GE235 accident include comments like "that was a Vmc roll". What is a Vmc roll and how should you avoid it and/or recover from it?
32
votes
6answers
8k views
Why do we never see high-bypass turbofan engines sharing the same nacelle on large airliners and similar aircraft?
I'm talking about this sort of thing (this is the fictional airplane from Casino Royale), rather than two (or more) engines per wing in individual nacelles:
If we ignore the weird 'drop tanks' on the ...
12
votes
1answer
2k views
Does a multi-engine rating propagate down from commercial to private?
I have a private pilot license with airplane single engine land and instrument ratings. I'm about to get the commercial with a airplane multi engine land class rating.
Let's say I'm not currently ...
21
votes
6answers
10k views
Why should you not turn in the direction of an inoperative engine?
In two-engine aircraft with wing-mounted engines when one engine quits the aircraft will have a natural tendency to turn to the dead engine. So if you need to turn, it seems logical it should be ...
15
votes
3answers
4k views
Would in flight engine failure of the passenger jet be reported?
A passenger plane with two or more engines would probably land without big difficulties with one engine inoperative.
Would the passengers be notified, asking to take the brace position during ...
10
votes
3answers
2k views
Single engine failure in a light twin after lift-off: what to do?
In a previous question the case about if a turnback would be feasible, specifically for a single engine aircraft, has been analysed.
But given a twin-engine general aviation aircraft and a single ...
12
votes
2answers
3k views
What is a 'Wing Loop Fault' on an A320 series Aircraft?
I was recently involved in a flight that had issues before take off. The plane was an Airbus 321.
It was explained to me as being a "wing loop fault". The problem was that the ECAM messages were ...
8
votes
2answers
2k views
How are jet engines certified against birdstrikes?
I recall that during US1549's birdstrike incident that resulted in it landing on the Hudson, a large amount of migrating geese weighing upto 20lbs each were sucked into the A320's engines — far ...
10
votes
2answers
3k views
Can I log time in a Cri-Cri twin-engine aircraft?
I was looking at potential experimental projects when I read this fascinating website about a tiny aerobatic-capable twin-engine airplane. It's light enough to be an ultralight, but much too fast:
...
