Questions tagged [multi-engine]
Aircraft equipped with more than one engine.
69
questions
14
votes
2answers
2k views
What determines the direction of rotation for counter-rotating propellers?
As Wikipedia and other sources make clear, most twins with counter-rotating props are configured with the left (#1) prop turning clockwise (as viewed from behind the plane) and the right (#2) prop ...
1
vote
1answer
101 views
How to improve engine-out handling on a multi-engined aircraft?
Hypothetically, if I wanted to create a multi-engine airplane with the best single-engine handling characteristics/lowest Vmc, would moving the vertical stabilizer far back be beneficial (even if it ...
0
votes
1answer
79 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
54 views
Requirements for multi-engine rating
In a facebook group I stumbled over this nice little picture:
Also there was a discussion about the type rating of this plane, especially if it classifies as a multi-engine plane. It is a Colomban ...
4
votes
2answers
185 views
Why don't multiengine aircraft have to demonstrate spin recoverability?
(Building off this earlier question about spin-testing airliners.)
For normal-category aircraft1 in the U.S. (at least), only single-engine (or, in the case of some gliders, no-engine) airplanes need ...
7
votes
2answers
153 views
Does a standalone EASA Multi-Engine Instrument Rating exist?
I'm starting an A320 type rating in a couple of months, but my MEP/IR is expiring before that. The pre-entry requirements were only a ME IR. Got me wondering: can I just revalidate my ME IR and let my ...
3
votes
1answer
265 views
Is there any legal way to fly an inline twin-engine aircraft with a single-engine certificate?
Is there any legal way to fly an inline twin-engine aircraft with only a single-engine endorsement? For example, if it's an ultralight or amateur built?
I understand Rutan's Defiant was an inline ...
25
votes
2answers
4k views
Do multi-engine jets need all engines with equal age to reduce asymmetry in thrust and fuel consumption arising out of deterioration?
Let's assume, one of the engines on a twin-jet needs replacement and the jet is is fitted with an old engine and a newer engine after the due replacement, the older engine would tend to produce less ...
5
votes
1answer
180 views
What adds more weight to a twinjet? Tail-engines or wing-engines?
Let's say we have a large commercial jet, with exactly 2 engines, capable of holding at least 200 passengers.
It could be a traditional jet like the Boeing 777, where both engines are in the wing. Or ...
3
votes
2answers
215 views
Eviation Alice Powerplant Placement
I saw an article from the BBC about the Eviation Alice this morning that left me puzzled. The design is a tail wheel tri-motor with the power plants located in a pusher configuration at the wing tips ...
18
votes
2answers
2k views
Why is the S-duct intake on the Tu-154 uniquely oblong?
Is there an advantage to the oval/elliptical shape of the Tu-154's S-duct intake? It appears to be taller and an overall different shape than the side-mounted cowlings.
This doesn't appear to be a ...
1
vote
0answers
91 views
Would throttle steering of a forward-swept-winged aircraft be possible?
Fortunately (or perhaps unfortunately, given the number of crashes that had to occur for us to figure it out), the use of throttle manipulation to control an airliner with disabled primary flight ...
4
votes
1answer
213 views
Do aircraft engineers take into consideration engine placement to avoid ground strikes in a cross-wind landing?
On a multi-engine airplane with wing-mounted engines, do aircraft designers have a standard way of ensuring that the banked landings associated with cross-wind's do not cause a prop or engine-housing ...
5
votes
5answers
803 views
Why does a pilot bank up to 5 degrees into the operating engine following failure of the other engine?
If a multi-engine aircraft suffers an engine failure while near minimum control speed (Vmc), one of the solutions is to bank up to 5 degrees into the operating engine to increase rudder effectiveness ...
4
votes
1answer
774 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
291 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
1answer
241 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
804 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!
2
votes
2answers
672 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
851 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
446 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?
3
votes
2answers
461 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
43 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
210 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
1k 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
21k 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 ...
11
votes
1answer
6k 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
454 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
515 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
186 views
Are run-ups required for multiengine piston aircraft?
Are run-ups required or advisable on multiengine piston aircraft?
14
votes
6answers
14k 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
273 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
448 views
1
vote
1answer
507 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, ...
20
votes
2answers
8k 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, ...
5
votes
1answer
1k 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
856 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
458 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 ...
18
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
177 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 ...
2
votes
1answer
503 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
2k 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 ...
8
votes
1answer
1k 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 ...
15
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
396 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
565 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
492 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 ...
24
votes
2answers
5k 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,...
