Linked Questions

51
votes
3answers
17k views

Can the A380 ferry an extra engine, like the 747?

A useful little quirk about the 747 is that it can ferry a fifth engine on the wing, for when another aircraft is stranded somewhere in the world. Does the A380 have the same capability? If not, how ...
39
votes
6answers
34k views

Why don't passenger aircraft use the trijet configuration anymore?

As a kid I distinctly remember seeing aircraft like the bright blue KLM MD-11 having the prominent third engine on the tail. https://commons.wikimedia.org/wiki/File:KLM_MD_11_AMS.jpg However, I don'...
38
votes
8answers
16k views

Why couldn't the A380 secure any orders for two straight years?

The double-decker aircraft has failed to win a single order from any new airline customer for two years now. Comparing its orders and sales with its biggest competitor, the B747 it had received 315 ...
16
votes
3answers
41k views

Why does the A340 have 4 engines instead of 2?

I have noticed for a while the A340 has four engines and the Boeing 777 only has two engines and they are about the same size. So why can't an A340 have two engines instead of four? A340 . B777 On ...
12
votes
3answers
4k views

Why are twin engine airliners more fuel efficient than three or four engine airliners?

It is said that given roughly similar aerodynamic and engine technology that twin engine airliners are more fuel efficient than 3 or 4 engine airliners. Why is this? The twin engine airliners tend ...
9
votes
5answers
1k views

Is it currently possible to build a jet engine with 1,050 kN of thrust? (236,049 lbf)

Do we currently have the engineering know-how to build a 1,050 kN jet engine? This question originated from the idea of changing a 4-engine aircraft into 2-engines. I chose the A380 since it seems to ...
4
votes
2answers
4k views

Why do modern airliners have only two engines? [duplicate]

In this terrific question we see the advantages of four engines over two. Namely: Engine out capability: Losing an engine means losing only one quarter of the thrust, rather than half. Ground ...
2
votes
1answer
2k views

What are the advantages/disadvantages of placing an engine in the tail? [duplicate]

What are the advantages and disadvantages of having an engine in the vertical stabilizer, a la the DC-10, Lockheed TriStar, and 727? It seems that this has gone out of fashion among jetliners. Is ...
-3
votes
2answers
6k views

How does a boeing 707 have 4 engines instead of 2? [duplicate]

I was reading a article Link It stated that lower bypass ratio jet engines have higher thrust than high bypass ratio engines, but the boeing 707 has 4 of these low bypass ratio engines and only ...
-8
votes
1answer
215 views

What is the reason for different number of front nozzles on commercial aircraft? [duplicate]

As we observe in commercial aircraft, that there are four or two front end nozzles for gas emission in the air. What is the reason for this variable of 4 or 2 nozzles? Why is it not a constant?