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Why Only 2 Thrust Reversers On The A380?  
User currently offlineUltimateDelta From United States of America, joined Sep 2007, 2064 posts, RR: 6
Posted (6 years 1 week 5 days 5 hours ago) and read 4598 times:

Hi, everyone. I have a question involving the Airbus A380 and its thrust reversers. Why does it only have them on the inboard engines? It seems as if a plane that size could benefit from having four, so why only two? Thanks for any info you have to offer.
UltimateDelta


Midwest Airlines- 1984-2010
11 replies: All unread, jump to last
 
User currently offlineThreeFourThree From Australia, joined Nov 2007, 209 posts, RR: 0
Reply 1, posted (6 years 1 week 5 days 4 hours ago) and read 4595 times:

It was deemed not necessary to even have reversers because the brakes are that good.
But they said they had to put at least 2 thrust reversers.
The A380's wings are huge and engines hang over the grass area and if they use reversers, they may have stuff fly into the engine.

BTW, this has been asked before, please use the search button

[Edited 2008-04-11 19:03:29]

User currently offlinePilotboi From United States of America, joined Sep 2007, 2366 posts, RR: 9
Reply 2, posted (6 years 1 week 5 days 4 hours ago) and read 4592 times:



Quoting ThreeFourThree (Reply 1):
The A380's wings are huge and engines hang over the grass area and if they use reversers, they may have stuff fly into the engine.

I think that was the primary reason...

Quoting ThreeFourThree (Reply 1):
It was deemed not necessary to even have reversers because the brakes are that good.
But they said they had to put at least 2 thrust reversers.

and that was the secondary reason.


User currently offlineStarlionblue From Greenland, joined Feb 2004, 16908 posts, RR: 67
Reply 3, posted (6 years 1 week 5 days 4 hours ago) and read 4590 times:

The weight and maintenance savings are not insignificant either.

Quoting UltimateDelta (Thread starter):
It seems as if a plane that size could benefit from having four, so why only two?

Modern brakes are many times more powerful than reversers. Size is somewhat inconsequential in itself since with increased size comes increased number of axles, larger brakes etc... Compare the number of braked axles on a 380 (10) with the number of braked axles on a 737 (2). Add to that larger discs.

Quoting ThreeFourThree (Reply 1):
BTW, this has been asked before, please use the search button

Many many times.  Wink



"There are no stupid questions, but there are a lot of inquisitive idiots."
User currently offlineJetMech From Australia, joined Mar 2006, 2638 posts, RR: 53
Reply 4, posted (6 years 1 week 5 days 4 hours ago) and read 4582 times:



Quoting UltimateDelta (Thread starter):

I'm still of the opinion that weight is the primary reason the A-380 does not have outboard thrust reversers. From previous threads on the subject, is appears that Airbus originally wanted to not have any thrust reversers at all.

Regards, JetMech



JetMech split the back of his pants. He can feel the wind in his hair.
User currently offlineWingedMigrator From United States of America, joined Oct 2005, 2139 posts, RR: 56
Reply 5, posted (6 years 1 week 5 days 2 hours ago) and read 4564 times:



Quoting Starlionblue (Reply 3):
Compare the number of braked axles on a 380 (10) with the number of braked axles on a 737 (2). Add to that larger discs.

Much agreed, but do note the A380-800 only has 8 braked axles (or, properly speaking, 16 brake units out of 20 MLG wheels)


User currently offlineStarlionblue From Greenland, joined Feb 2004, 16908 posts, RR: 67
Reply 6, posted (6 years 1 week 5 days 2 hours ago) and read 4556 times:



Quoting WingedMigrator (Reply 5):
Much agreed, but do note the A380-800 only has 8 braked axles (or, properly speaking, 16 brake units out of 20 MLG wheels)

Sorry. Quite true. 8 braked axles.



"There are no stupid questions, but there are a lot of inquisitive idiots."
User currently offlineAutoThrust From Switzerland, joined Jun 2006, 1546 posts, RR: 9
Reply 7, posted (6 years 1 week 4 days 18 hours ago) and read 4505 times:

Its not only the brakes, its also the huge wing which allows the A380 to land a at the speed of a A320, thats about 132kn. Lower landing speeds are always a improvement of safety because you have to break less and obviously need less runway.


“Faliure is not an option.”
User currently offlineStarlionblue From Greenland, joined Feb 2004, 16908 posts, RR: 67
Reply 8, posted (6 years 1 week 4 days 18 hours ago) and read 4500 times:



Quoting AutoThrust (Reply 7):
Lower landing speeds are always a improvement of safety because you have to break less and obviously need less runway.

Apart from breaking less, you also brake less.  Wink



"There are no stupid questions, but there are a lot of inquisitive idiots."
User currently offlineJetlagged From United Kingdom, joined Jan 2005, 2532 posts, RR: 24
Reply 9, posted (6 years 1 week 4 days 16 hours ago) and read 4474 times:

Maybe A.net ought to have a list of Tech/Ops FAQs to stop the continual reposting of the same questions (A380 reversers, 767 landing gear, powerback, etc) followed by a mixture of correct answers and repeated myths.

It's all very well saying use the search facility, but if you ask the search engine the wrong question it finds nothing. Google it isn't.



The glass isn't half empty, or half full, it's twice as big as it needs to be.
User currently offlineTdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 80
Reply 10, posted (6 years 1 week 4 days 13 hours ago) and read 4414 times:



Quoting Jetlagged (Reply 9):
Maybe A.net ought to have a list of Tech/Ops FAQs to stop the continual reposting of the same questions (A380 reversers, 767 landing gear, powerback, etc)

Good idea. Add to that the bloody double bogie A320's in India.

Tom.


User currently offlineStarlionblue From Greenland, joined Feb 2004, 16908 posts, RR: 67
Reply 11, posted (6 years 1 week 4 days 3 hours ago) and read 4369 times:



Quoting Jetlagged (Reply 9):
It's all very well saying use the search facility, but if you ask the search engine the wrong question it finds nothing. Google it isn't.

True. However you can use Google itself. Try this: "site:airliners.net 380 two reversers". I use Google a lot as an alternative to the photo engine: "site:airliners.net 747sp" then click "images".



"There are no stupid questions, but there are a lot of inquisitive idiots."
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