Questions tagged [multi-engine]

Aircraft equipped with more than one engine.

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9 votes
4 answers
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Why are there (almost) no civilian single engine jet aircraft?

I have been looking at various engine configuration in jet powered aircraft. Most have 2 jet engines mounted either side of the fuselage, there are trijet models (e.g. B-727, MD-11) there are also 4-...
Aleks G's user avatar
  • 455
2 votes
1 answer
186 views

Are there any twin-engine turboprop airplanes with FADEC and 6 seats?

Are there any twin-engine airplanes with FADEC with 6 seats? Is there nothing equivalent to DA62 in the turboprop world with slightly bigger interior and club seats?
gnjago's user avatar
  • 121
4 votes
1 answer
592 views

Does a single-engine-land license plus a multi-engine-sea license allow you to fly multi-engine-land and single-engine-sea?

I have a single-engine land PPL. I'm looking at getting training in a multi-engine seaplane. Does the fact that I already have a land airplane rating allow me to fly a multi-engine land plane? (I did ...
HiddenWindshield's user avatar
1 vote
2 answers
229 views

In a push-pull twin, which engine is number one?

I know this is kind of a silly question, but I'm curious. On a "standard" multi-engine airplane, the engines are numbered from port to starboard, with the furthest port engine being number ...
HiddenWindshield's user avatar
1 vote
3 answers
190 views

Would twin-engine airplanes be safer (in case of engine failure) if had minimal dihedral?

In the specific context of the sudden failure of one engine, would twin-engine airplanes (with wing-mounted engines) be safer if designed with minimal dihedral, so that aerodynamic coupling between ...
quiet flyer's user avatar
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6 votes
3 answers
525 views

What causes a jet airliner (with a yaw damper) to roll toward the "weaker" engine during an asymmetrical thrust condition?

Please help me better understand what causes a jet airliner (such as the Boeing 737-500) to roll toward the "weaker" engine when power is reduced on one side. Such as in the situations ...
quiet flyer's user avatar
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-2 votes
1 answer
322 views

What does "throttle is staggered" mean? [closed]

What does "throttle is staggered" mean? and how is it related to adjustment of MEC(Main Engine Control) in B737-300(CFM56-3C)?and which are safety issues regarding that?
DYNAMICS's user avatar
0 votes
1 answer
368 views

What is significant in Diamond DA-42 over DA-40 apart from engine redundancy?

Aircraft/Characteristic Diamond Star DA-40 Diamond Star DA-42 Span 11.94m 13.42m Wing area 13.54 m² 16.29 m² Max Occupants 4 4 $Va$ 108 KIAS 126 KIAS $Vno$ 129 KIAS 155 KIAS $Vne$ 178 KIAS 194 ...
Krishna Kanth's user avatar
2 votes
2 answers
640 views

High performance endorsement

If I am a Commercial multi rated pilot with high performance and CFI. But not CFII or MEI, can I give a high performance endorsement to another commercial multi rated pilot in a multi engine? The ...
Tyler's user avatar
  • 21
0 votes
0 answers
27 views

Rating Title Differences with ICAO CPL

I graduated from an integrated ATPL programme in Turkey. Rating part of my CPL is comprised of two lines. Goes like: IR/ME Valid until ... MEP(land) Valid until.. However, my friend from my class(with ...
Mertali Çakmak's user avatar
3 votes
1 answer
179 views

What is the aerodynamic influence of prop spacing and placement in multi-prop engine setups

I saw this question Is there a rule of thumb for spacing between jet engines?, which referred to How do you choose engine placement for under wings engines?, but I was wondering how the engine spacing ...
ROIMaison's user avatar
  • 7,157
6 votes
1 answer
1k views

Why don't all twin engines counter-rotate?

It seems that having counter-rotating twin engines would be a natural choice to avoid the unwanted yaw seen in single engines and yet there are several twin-engine aircrafts that that aren't counter-...
Tfovid's user avatar
  • 165
3 votes
2 answers
359 views

Engine torque due to Turbofan engines and its effect on aircraft attitude [duplicate]

I know that for turbofan engines there will be Gyroscopic effects while pitching, rolling and yawing maneuvre. But if the aircraft is cruising at an altitude or is simply idling on the ground, what ...
itsChibi's user avatar
  • 119
4 votes
4 answers
1k views

Why would an airplane with fixed-pitch propeller(s) and no supercharging have manifold pressure gauges? (E.g. Ford Trimotor)

I had recently had a look at the Ford Trimotor NC9645 (link), currently on an EAA-sponsored tour. The propellers were fixed pitch (possibly adjustable by mechanic on ground), and the engines were not ...
quiet flyer's user avatar
  • 22.3k
0 votes
1 answer
226 views

How to determine engine CG in order to calculate moments acting on it?

The aircraft has four engines mounted in pods under the wing. I know the values for the location of engine nacelle front face from the fuselage nose (longitudinal) and distance between engine ...
itsChibi's user avatar
  • 119
3 votes
1 answer
1k views

Why do twin-engine Diamond aircraft have a single FADEC lever instead of two engine throttles?

From my understanding, if you have a twin-engine aircraft with 2 lever engine throttle one for each engine you will be able to use differential thrust to steer in case of steering malfunction. I don't ...
Kyrielight's user avatar
11 votes
2 answers
3k 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
0 votes
2 answers
311 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
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-2 votes
1 answer
244 views

Should a runway overrun be expected if takeoff is begun with one-engine-out?

Multi-engine aircraft have enough power to successfully takeoff if one engine fails after V1. But what if, on a runway equal to the specified takeoff distance, someone decided to roll with one engine ...
Abdullah is not an Amalekite's user avatar
1 vote
1 answer
276 views

How do you quantify rudder effectiveness as a function of bank angle?

I'm currently reviewing just for fun aircraft dynamics based on OEI (one engine inoperative) scenarios. After reading that "lower pedal forces at higher bank angles" are required, it got me ...
Lorenzo Capasso's user avatar
11 votes
3 answers
5k views

I am licensed as a Private Pilot, Airplane Multiengine Land, what do I need to do to be able to fly as PIC in a Single Engine Land aircraft?

I basically got my Multi Engine Rating however not a single engine rating even though most of my training was in ASEL. Now I am curious what I would have to do to be able to fly friends and family in ...
Mark Udin's user avatar
  • 119
2 votes
2 answers
364 views

Does transport-type certification account for engine separation and its possible effect on hydraulic lines?

This question is inspired by the United Airlines Flight 328 where the No. 2 engine is damaged. Some multi-engine aircraft are design to withstand the detachment of an engine while some are not. Boeing ...
Mys_721tx's user avatar
  • 183
16 votes
2 answers
2k views

Can anyone Identify this FLY FAIR seaplane?

This photograph, from my family's collection, of a high-winged, dual rotary engine, amphibious airplane, probably in the 1930's, appears to be an excursion plane at a fair since it has "FLY FAIR&...
FreshBreeze's user avatar
  • 1,221
0 votes
1 answer
1k views

Why does Vmca decrease with increasing altitude?

A question from a mock MEP class rating test: Many thanks for your help.
tedioustortoise's user avatar
8 votes
2 answers
467 views

Why do the Comet's engines point outwards?

As it's visible from the images below, when looking at the plane from the top, the engines point outwards and they are banana-shaped, why is that? (unfortunately I couldn't find a real photo ...
Salomanuel's user avatar
33 votes
2 answers
7k 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 ...
Michael MacAskill's user avatar
17 votes
2 answers
4k 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 ...
apDafydd's user avatar
  • 179
2 votes
2 answers
198 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 ...
Dmitri Scheidel's user avatar
1 vote
2 answers
740 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 ...
user45500's user avatar
4 votes
2 answers
782 views

What is the FAA's definition of a "multi-engine aircraft" that requires a 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 ...
Matthias Nicklisch's user avatar
6 votes
3 answers
3k 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 ...
Vikki's user avatar
  • 28.3k
7 votes
2 answers
251 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 ...
Cédric D.'s user avatar
3 votes
1 answer
540 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 ...
Fred's user avatar
  • 1,517
27 votes
2 answers
5k 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 ...
jayS's user avatar
  • 908
6 votes
1 answer
329 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 ...
DrZ214's user avatar
  • 17.7k
4 votes
2 answers
345 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 ...
dlu's user avatar
  • 141
19 votes
2 answers
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 ...
zymhan's user avatar
  • 2,238
1 vote
0 answers
127 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 ...
Vikki's user avatar
  • 28.3k
4 votes
1 answer
235 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 ...
Ryan Mortensen'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
  • 477
6 votes
1 answer
3k 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 ...
user186363's user avatar
3 votes
3 answers
1k 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 ...
Vikki's user avatar
  • 28.3k
0 votes
1 answer
762 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 ...
Joey's user avatar
  • 91
1 vote
1 answer
2k 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!
Carlos_Dreamer's user avatar
2 votes
2 answers
1k 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 ...
brian's user avatar
  • 35
2 votes
4 answers
2k 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, ...
acpilot's user avatar
  • 6,018
1 vote
2 answers
2k 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?
Melvin Toro's user avatar
3 votes
2 answers
842 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 ...
Devil07's user avatar
  • 8,554
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
1 vote
0 answers
55 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) ...
Max Hong's user avatar