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or negative angles of attack.
WCA. See wind correction angle.
Weather briefing. Means for pilots to gather information
vital to the nature of the flight from a flight service station
specialist.
Weathervane. The tendency to point into the wind.
Weight. A measure of the heaviness of an object. One of the
four main forces acting on an aircraft. The force by which a
body is attracted downward toward the center of the Earth
(or another celestial body) by gravity. Weight is equal to
the mass of the body times the local value of gravitational
acceleration.
Weight-Shift Control Aircraft. Powered aircraft with a
framed pivoting wing and a fuselage controllable only in
pitch and roll by the pilot’s ability to change the aircraft’s
center of gravity with respect to the wing. Flight control of
the aircraft depends on the wing’s ability to flexibly deform
rather than the use of control surfaces.
Whip stall. A pitch attitude that is too high for a WSC,
at which the tips would stall from flying outside the WSC
limitations or flying in extreme/severe turbulence.
Wind correction angle. Correction applied to the course to
establish a heading so that track will coincide with course.
Also called the Crab angle.
Wind direction indicators. Indicators that include a
wind sock, wind tee, or tetrahedron. Visual reference will
determine wind direction and runway in use.
Wind drift correction. Correction applied to the heading
of the aircraft necessary to keep the aircraft tracking over a
desired track. Also called the wind correction angle or crab
angle.
G-20
Wind shear. A sudden, drastic shift in wind speed, direction,
or both that may occur in the horizontal or vertical plane.
Wing. A fabric skin with an aluminum frame that produces
the lift necessary to support the WSC in flight; including the
flight wires/control frame below and the ground wires/king
post above.
Wing keel. The WSC structural component in the longitudinal
center of the wing that connects the two leading edges
together at the nose and connects the carriage to the wing.
Wing loading. The amount of weight that a wing must
support to provide lift.
Wingspan. The maximum distance from wingtip to
wingtip.
Wing twist. A design feature of the WSC that reduces the
angle of attack from the root to the tip.
Wingtip vortices. The rapidly rotating air that spills over an
aircraft’s wings during flight. The intensity of the turbulence
depends on the aircraft’s weight, speed, and configuration. It
is also referred to as wake turbulence. Vortices from heavy
aircraft may be extremely hazardous to small aircraft.
World Aeronautical Charts (WAC). A standard series
of aeronautical charts covering land areas of the world at a
size and scale convenient for navigation (1:1,000,000) by
moderate speed aircraft. Topographic information includes
cities and towns, principal roads, railroads, distinctive
landmarks, drainage, and relief. Aeronautical information
includes visual and radio aids to navigation, airports, airways,
restricted areas, obstructions and other pertinent data.
WSC. See weight-shift control.
Weight-Shift Control—Land (WSCL). WSC that takes off
and lands on land. This can be wheels or ski equipped.
Weight-Shift Control—Sea (WSCS). WSC that takes of the
water. This can be pontoons or a boat configuration.
Yaw. Rotation about the vertical axis of an aircraft.
Zulu time. A term used in aviation for Coordinated Universal
Time (UTC) which places the entire world on one time
standard.
I-1
Index
black-hole approach .....................................................12-8
bouncing during touchdown ......................................11-29
C
cables and hardware .......................................................3-7
camber ............................................................................2-1
carriage .........................................................................3-10
carriage inspection .......................................................5-18
carriage moments ............................................... 2-16, 2-17
center of gravity ...........................................................2-11
certifi cates and documents ...........................................5-15
checklist after entering fl ight deck ...............................5-23
checklist for taxi ...........................................................5-25
climbs and climbing turns ............................................6-12
collision avoidance .........................................................1-9
　
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