Wing tips
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Brendon
Sep 25, 2008, 10:31:46 AM9/25/08
to SAE Aero Embry-Riddle
I found this on a website. It is what Boeing had to say about
wingtips
Aerodynamic Wing Tip Gives More Lift Without Lengthening Wing
The 767-400ER features new, highly back-swept (raked) wing-tip
extensions that increase the 767's 156-foot wingspan to 170 feet, 4
inches (51.9 m). The 7-foot-8-inch (2.4 m) wing extensions are
designed to increase the aerodynamic efficiency of the wing. Another
advantage of the raked wing-tip design is its simplicity. It is
lightweight and bolts into place, with no additional design changes
needed to the tip or leading edges of the 767-300 wing. This
efficiency of design and economy of structure affords the 767-400ER
more gate and taxiway flexibility. It can use the same gates as the
DC-10-30, MD-11 and L-1011, unlike the A330-200, which must use gates
sized by the industry for large airplanes such as the 747 and 777. The
raked wing tip balances cruise efficiency and airplane weight to
achieve improved range.
Someone commenting had this to say about it.
"Despite the mutually exclusive statements "...gives more lift without
lengthening wing" and "...increase the 767's 156-foot wingspan to 170
feet, 4 inches..." this paragraph boils down to increased aerodynamic
efficiency. For all intents and purposes, that means decreased drag.
This factor we can understand simply because the extensions increase
the wingspan. In previous questions, we have discussed some of the
types of drag that an aircraft experiences, and most important of
these is induced drag, or the drag that is caused by the process of
generating lift. Without going into too much detail, any finite
surface that has tips and produces lift will also produce drag. This
drag is created by turbulent vortices, called trailing vortices, that
are generated at the tips of a lifting surface like a wing.
Creation of trailing vortices due to a difference in pressure above
and below a lifting surface"
Rather than flooding the discussion with text. View the website here:
http://www.aerospaceweb.org/question/aerodynamics/q0148.shtml
wingtips
Aerodynamic Wing Tip Gives More Lift Without Lengthening Wing
The 767-400ER features new, highly back-swept (raked) wing-tip
extensions that increase the 767's 156-foot wingspan to 170 feet, 4
inches (51.9 m). The 7-foot-8-inch (2.4 m) wing extensions are
designed to increase the aerodynamic efficiency of the wing. Another
advantage of the raked wing-tip design is its simplicity. It is
lightweight and bolts into place, with no additional design changes
needed to the tip or leading edges of the 767-300 wing. This
efficiency of design and economy of structure affords the 767-400ER
more gate and taxiway flexibility. It can use the same gates as the
DC-10-30, MD-11 and L-1011, unlike the A330-200, which must use gates
sized by the industry for large airplanes such as the 747 and 777. The
raked wing tip balances cruise efficiency and airplane weight to
achieve improved range.
Someone commenting had this to say about it.
"Despite the mutually exclusive statements "...gives more lift without
lengthening wing" and "...increase the 767's 156-foot wingspan to 170
feet, 4 inches..." this paragraph boils down to increased aerodynamic
efficiency. For all intents and purposes, that means decreased drag.
This factor we can understand simply because the extensions increase
the wingspan. In previous questions, we have discussed some of the
types of drag that an aircraft experiences, and most important of
these is induced drag, or the drag that is caused by the process of
generating lift. Without going into too much detail, any finite
surface that has tips and produces lift will also produce drag. This
drag is created by turbulent vortices, called trailing vortices, that
are generated at the tips of a lifting surface like a wing.
Creation of trailing vortices due to a difference in pressure above
and below a lifting surface"
Rather than flooding the discussion with text. View the website here:
http://www.aerospaceweb.org/question/aerodynamics/q0148.shtml
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