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Why Doesn't Airbus Put Winglets On The A306?  
User currently offlineFalconBird From United States of America, joined May 2007, 1262 posts, RR: 1
Posted (6 years 4 months 1 week 2 days 19 hours ago) and read 6380 times:

Looking at some of American's A306's, I was wondering why Airbus, or perhaps A306 carriers haven't put winglets on their birds. Now, yes they do have the very small type winglets, but nothing bigger.

http://www.airliners.net/photo/Ameri...=7&prev_id=1356742&next_id=1356341


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13 replies: All unread, jump to last
 
User currently offlineLIA310 From Trinidad and Tobago, joined Mar 2008, 407 posts, RR: 0
Reply 1, posted (6 years 4 months 1 week 2 days 18 hours ago) and read 6349 times:

because those smaller winglets are probably some how more suited to the A306 and the larger winglets may not do so much more, maybe someone else can expand on this point

User currently offlineCaribbean484 From Trinidad and Tobago, joined Jan 2007, 2638 posts, RR: 1
Reply 2, posted (6 years 4 months 1 week 2 days 18 hours ago) and read 6316 times:

Maybe its because of the times of such designs. If I remembered the 747-400 was the first commercial aircraft to use winglets instead of the wingfences the A300/A310/A320family uses. At this time really it makes little sence to place them as the fleet is already being replace by newer technology aircrafts and the small number of a/c flying.


All ah we is one family
User currently offlineGigneil From United States of America, joined Nov 2002, 16347 posts, RR: 85
Reply 3, posted (6 years 4 months 1 week 2 days 18 hours ago) and read 6245 times:

The brand new A380 has wingtip fences.

It reallllly depends on the wing.

NS


User currently offlineCaribbean484 From Trinidad and Tobago, joined Jan 2007, 2638 posts, RR: 1
Reply 4, posted (6 years 4 months 1 week 2 days 18 hours ago) and read 6225 times:

True maybe its because of the design of the wings, I forgot that the A380 was wing fences. Aerodynamic technology will dictate whether or not such requirements is necessary. Do wing fences do the same in reducing drag as the winglets anyone?


All ah we is one family
User currently offlineTdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 80
Reply 5, posted (6 years 4 months 1 week 2 days 15 hours ago) and read 6178 times:



Quoting Gigneil (Reply 3):
It reallllly depends on the wing.

Bingo. It's not at all clear that the A306 wing has enough margin to support a winglet.

Quoting Caribbean484 (Reply 4):
Aerodynamic technology will dictate whether or not such requirements is necessary.

Not really...a winglet is never necessary. It may be advantageous, it may not. Aerodynamics will tell you how much you'll gain, but structures needs to get involved to tell you how much you'll lose.

Quoting Caribbean484 (Reply 4):
Do wing fences do the same in reducing drag as the winglets anyone?

Fences are not as effective, though the drag reduction mechanism is essentially the same.

Tom.


User currently offlineHAWK21M From India, joined Jan 2001, 31684 posts, RR: 56
Reply 6, posted (6 years 4 months 1 week 2 days 15 hours ago) and read 6177 times:

Maybe aerodynamically the Winglets if fitted would not have made a significant difference considering the cost & age of the Airframe these days.

regds
MEL



Think of the brighter side!
User currently offlineStarlionblue From Greenland, joined Feb 2004, 17054 posts, RR: 67
Reply 7, posted (6 years 4 months 1 week 2 days 15 hours ago) and read 6173 times:

As Tdscanuck hints at aerodynamics isn't everything. It's no use slapping winglets on if you decrease the fatigue life of the wing too much.

Also, there's the question of cost of development + mounting vs benefit.



"There are no stupid questions, but there are a lot of inquisitive idiots."
User currently offlineBAe146QT From United Kingdom, joined Sep 2006, 996 posts, RR: 0
Reply 8, posted (6 years 4 months 1 week 2 days 6 hours ago) and read 6085 times:

Kelly Johnson once said, "You don't need wing fences. You need a new wing."

Wonder what he would have made of winglets?



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User currently offlineStarlionblue From Greenland, joined Feb 2004, 17054 posts, RR: 67
Reply 9, posted (6 years 4 months 1 week 1 day 20 hours ago) and read 5966 times:

Hehe. To be fair Kelly Johnson seemed to be more specialized in rather extreme aircraft where things like fuel consumption were secondary considerations.


"There are no stupid questions, but there are a lot of inquisitive idiots."
User currently offlineJetlagged From United Kingdom, joined Jan 2005, 2556 posts, RR: 24
Reply 10, posted (6 years 4 months 1 week 1 day 19 hours ago) and read 5953 times:



Quoting Starlionblue (Reply 9):
Hehe. To be fair Kelly Johnson seemed to be more specialized in rather extreme aircraft where things like fuel consumption were secondary considerations.

Wing fences and winglets are there for different reasons. Fences are an aerodynamic fix. Good wings don't need fences, which contribute nothing except drag. I suspect he might have seen a use for winglets.



The glass isn't half empty, or half full, it's twice as big as it needs to be.
User currently offlinePolymerPlane From United States of America, joined May 2006, 991 posts, RR: 3
Reply 11, posted (6 years 4 months 1 week 1 day ago) and read 5840 times:



Quoting Gigneil (Reply 3):
The brand new A380 has wingtip fences.

It reallllly depends on the wing.

I thought the A380 was fitted with wingtip fences more because of the wing span (79.8 m) to fit the standard gate area so it does not need a bigger area compared to the biggest classification now (80 m x 80 m).

Cheers,
PP



One day there will be 100% polymer plane
User currently offlineStarlionblue From Greenland, joined Feb 2004, 17054 posts, RR: 67
Reply 12, posted (6 years 4 months 1 week 20 hours ago) and read 5789 times:



Quoting PolymerPlane (Reply 11):
I thought the A380 was fitted with wingtip fences more because of the wing span (79.8 m) to fit the standard gate area so it does not need a bigger area compared to the biggest classification now (80 m x 80 m).

Indeed. The fences are a way of remaining in the 80x80 box. BTW that's not the biggest classification. The An-225 is bigger. It is a way for the airports to ensure they can handle the size of the aircraft for taxi and parking at gates.



"There are no stupid questions, but there are a lot of inquisitive idiots."
User currently offlineBAe146QT From United Kingdom, joined Sep 2006, 996 posts, RR: 0
Reply 13, posted (6 years 4 months 1 week 3 hours ago) and read 5724 times:



Quoting Jetlagged (Reply 10):

Wing fences and winglets are there for different reasons

Yessir, I am aware that there is a difference in purpose.

I just liked the mental image of one of KJ's underlings coming to him with a design for a wingleted wing, and him going purple in the face for the .1 of a second that it took him to realise that this wasn't the mother and father of all fences.

'Twas a play on his own words, you see.



Todos mis dominós son totalmente pegajosos
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