Questions tagged [multi-engine]

Aircraft equipped with more than one engine.

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22
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, ...
31
votes
2answers
6k views

What is this large engine doing on a B52?

In this YouTube video, discussing plans to use the 747 as an aircraft carrier, there is a brief sequence starting at 4 min 14 s, showing images of a B52: What is the explanation for the very ...
6
votes
2answers
22k 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 ...
1
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2answers
120 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 ...
1
vote
1answer
109 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 ...
14
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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 ...
15
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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-...
11
votes
2answers
4k 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: ...
7
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2answers
168 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
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0answers
65 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 ...
5
votes
2answers
212 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 ...
2
votes
1answer
569 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
5answers
986 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 ...
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 ...
3
votes
1answer
284 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 ...
5
votes
1answer
193 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 ...
24
votes
9answers
13k 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 ...
3
votes
2answers
237 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
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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 ...
14
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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
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0answers
93 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
216 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
1answer
948 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
308 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
265 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 ...
2
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4answers
969 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, ...
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 ...
1
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1answer
900 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!
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 ...
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 ...
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 ...
2
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2answers
781 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 ...
1
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2answers
511 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
489 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 ...
15
votes
2answers
407 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 ...
1
vote
1answer
528 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, ...
5
votes
1answer
517 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.
21
votes
4answers
24k 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?
1
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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) ...
33
votes
6answers
9k 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 ...
8
votes
1answer
463 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'...
12
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1answer
3k 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 ...
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 ...
3
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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 ...
39
votes
4answers
19k views

Do turbine engines on multi-engine aircraft rotate in opposite directions to offset torque?

I'm not an aviator, I guess I'd call myself an enthusiast. I'm also a physics nut. I've always wondered about this but I equally worried my question posed to a commercial airline crew would land me in ...
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 ...
5
votes
1answer
517 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
196 views

Are run-ups required for multiengine piston aircraft?

Are run-ups required or advisable on multiengine piston aircraft?
1
vote
1answer
457 views

Do multi engines face the torque effect?

Do multi engines face the torque effect? What about jets?
1
vote
1answer
275 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?