What are winglets installed in aircrafts for ?? Except for making them prettier and looking cool 
And also why winglets look different ??
For example why the winglet on
Airbus A340
[photoid=288018]
is different that the one on A380
[photoid=495927]
and different that the 737NG
[photoid=5619029]
and why does MD-11 has the "extra" one on the bottom??
[photoid=309855]
What's the difference between them excpet for the look ?

And also why winglets look different ??
For example why the winglet on
Airbus A340
[photoid=288018]
is different that the one on A380
[photoid=495927]
and different that the 737NG
[photoid=5619029]
and why does MD-11 has the "extra" one on the bottom??
[photoid=309855]
What's the difference between them excpet for the look ?
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