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UltimateDelta
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Why Only 2 Thrust Reversers On The A380?

Sat Apr 12, 2008 1:41 am

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
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threefourthree
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RE: Why Only 2 Thrust Reversers On The A380?

Sat Apr 12, 2008 1:58 am

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]
 
pilotboi
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RE: Why Only 2 Thrust Reversers On The A380?

Sat Apr 12, 2008 2:03 am



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.
 
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Starlionblue
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RE: Why Only 2 Thrust Reversers On The A380?

Sat Apr 12, 2008 2:10 am

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." - John Ringo
 
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jetmech
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RE: Why Only 2 Thrust Reversers On The A380?

Sat Apr 12, 2008 2:44 am



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
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WingedMigrator
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RE: Why Only 2 Thrust Reversers On The A380?

Sat Apr 12, 2008 4:26 am



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)
 
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Starlionblue
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RE: Why Only 2 Thrust Reversers On The A380?

Sat Apr 12, 2008 4:57 am



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." - John Ringo
 
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autothrust
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RE: Why Only 2 Thrust Reversers On The A380?

Sat Apr 12, 2008 12:49 pm

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.”
 
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Starlionblue
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RE: Why Only 2 Thrust Reversers On The A380?

Sat Apr 12, 2008 12:57 pm



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." - John Ringo
 
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Jetlagged
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RE: Why Only 2 Thrust Reversers On The A380?

Sat Apr 12, 2008 2:56 pm

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.
 
tdscanuck
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RE: Why Only 2 Thrust Reversers On The A380?

Sat Apr 12, 2008 5:53 pm



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.
 
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Starlionblue
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RE: Why Only 2 Thrust Reversers On The A380?

Sun Apr 13, 2008 3:51 am



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." - John Ringo

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