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Questions tagged [multi-engine]

Aircraft equipped with more than one engine.

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42 votes
4 answers
24k 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 ...
cfx's user avatar
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34 votes
6 answers
10k 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 ...
mdunsmuir's user avatar
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31 votes
6 answers
10k 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 ...
CGCampbell's user avatar
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23 votes
2 answers
13k 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, ...
PerlDuck's user avatar
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25 votes
9 answers
22k 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 ...
Jan Hudec's user avatar
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9 votes
2 answers
3k 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 ...
Danny Beckett's user avatar
5 votes
5 answers
6k 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 ...
Mun Park's user avatar
  • 497
11 votes
2 answers
4k views

Why is the ball no longer centred in a multi-engine airplane with inoperable engine?

I'm currently working on my PPL, and whilst trying to understand fully how the turn coordinator works, I got down a rabbit hole that makes me question my understanding, and that I can't dig myself out ...
mathrick's user avatar
  • 296
4 votes
2 answers
1k views

How can using split throttles help when landing twins in crosswinds?

In General Aviation light twins, when landing in heavy crosswinds, what are some considerations to using asymmetric (or Split) throttles to induce a sideslip, to align the fuselage with the ground ...
Charles Bretana's user avatar
25 votes
3 answers
6k 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,...
h22's user avatar
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22 votes
5 answers
37k 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?
Pondlife's user avatar
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15 votes
2 answers
2k 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-...
RaajTram's user avatar
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15 votes
3 answers
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 ...
h22's user avatar
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14 votes
2 answers
5k 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: ...
user2105469's user avatar
12 votes
1 answer
4k 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 ...
Philipp's user avatar
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10 votes
3 answers
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 ...
Federico's user avatar
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10 votes
1 answer
8k 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 ...
Computer's user avatar
  • 203
10 votes
1 answer
2k 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, ...
FreeMan's user avatar
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8 votes
4 answers
3k views

During a takeoff emergency, is it safer to abort or continue the takeoff if either can be done within the available runway?

In a multi-engine airplane, if an engine failure occurs at the exact moment that a decision needs to be made to reject or continue the takeoff, and there is plenty of runway available to do either, ...
Lnafziger's user avatar
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7 votes
2 answers
804 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 ...
Maverick283's user avatar
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6 votes
1 answer
4k 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 ...
Victor Juliet's user avatar
6 votes
2 answers
2k 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 ...
Trebia Project.'s user avatar
6 votes
3 answers
2k views

What are the V-Speeds used during a normal takeoff in a multi-engine airplane?

This is what I know: $V_1$ is the takeoff airspeed after which the aircraft must take off, no matter what happens after $V_1$ has been reached. That's the easy part (I think). $V_R$ is the rotation ...
Philippe Leybaert's user avatar
5 votes
1 answer
787 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.
user avatar
2 votes
1 answer
2k 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 ...
QuaternionsRock's user avatar
0 votes
2 answers
328 views

Can aileron control maintain track in a single engine failure on a twin?

Let us say I am flying a twin-engine aircraft and I got a engine failure during cruise, without any control on rudder and use the ailerons only, can I still maintain the target track or heading? Will ...
VvV's user avatar
  • 1,589