Futaba FX-40 - Manual (Page 103)

103 <Model Menu (Airplane/Glider Functions)>
RUDDER 1
Winglet
at Flying wing
( )
RUDDER 2
Winglet
at Flying wing
( )
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This function adjusts the rubber left and right
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Winglets are used to improve the efficiency of
aircraft lowering the lift-induced drag caused by
wingtip vortices. The winglet is a vertical or angled
extension at the tips of each wing.
Winglets work by increasing the effective aspect
ratio wing without adding greatly to the structural
stress and hence necessary weight of its structure
- an extension of wing span would also permit
lowering of induced drag, though it would cause
parasitic drag and would require boosting the
strength of the wing and hence its weight - there
would come a point at which no overall useful
saving would be made. A winglet helps to solve this
by effectively increasing the aspect ratio without
adding to the span of the wing.
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be individually set.
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(Gr./Sngl)
(For more information, see the description
at the back of this manual.)