To Whom it May Concern,
I asked a Boeing engineer a few years ago
why winglets were being added to the -400
revision of the 747. Her response was that they
were there to reduce turbulence at the end of the
wing, thereby increasing fuel efficiency.
However, I have noticed that some planes have
them (A-330, 747-400, MD11) and others do not
(777, A-380, etc.).
If what she said was true, I would have expected
all new planes to have them.
Can anybody shed any light on why some of these
new planes do not have winglets?
Posts and email welcome.
Thanks in advance.
regards,
Lars Ewell
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