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should immediately release from the aerotow.
COMMON ERRORS
• Failure to take corrective action at the first
indication of a slack line.
• Use of improper procedure to correct slack
line, causing excessive stress on tow rope,
towplane, and glider.
BOXING THE WAKE
Boxing the wake is a performance maneuver designed
to demonstrate a pilot’s ability to accurately maneuver
the glider around the towplane’s wake during aerotow.
[Figure 7-12]
Boxing the wake requires flying a rectangular pattern
around the towplane’s wake. Before starting the
maneuver, the glider should descend through the wake
to the center low tow position as a signal to the towpilot
that the maneuver is about to begin. The pilot uses
coordinated control inputs to move the glider out to one
side of the wake and holds that lower corner of the rectangle
momentarily with rudder pressure. Applying
back pressure to the control stick starts a vertical
ascent, then rudder pressure is used to maintain equal
Glider, having risen too high above towplane,
dives down on towplane, inducing slack towline.
Figure 7-11. Diving on towplane.
7-11
distance from the wake. The pilot holds the wings level
with the ailerons to parallel the towplane’s wings.
When the glider has attained high corner position, the
pilot momentarily maintains this position.
As the maneuver continues, the pilot reduces the rudder
pressure and uses coordinated flight controls to
bank the glider to fly along the top side of the box. The
glider should proceed to the opposite corner using
aileron and rudder pressure, as appropriate. The pilot
maintains this position momentarily with rudder pressure,
then begins a vertical descent by applying forward
pressure to the control stick. Rudder pressure is
used to maintain glider position at an equal distance
from the wake. The pilot holds the wings level with the
ailerons to parallel the towplane’s wings. When the
glider has attained low corner position, the pilot
momentarily maintains this position. The pilot releases
the rudder pressure and, using coordinated flight controls,
banks the glider to fly along the bottom side of
the box until reaching the original center low tow position.
From center low tow position, the pilot maneuvers
the glider through the wake to the center high tow
position, completing the maneuver.
COMMON ERRORS
• Performing an excessively large rectangle
around the wake.
• Improper control coordination and procedure
• Abrupt or rapid changes of position.
Upper Left Corner
Lower Left Corner
Upper Right Corner
Lower Right Corner
Normal Low
Tow Position
Normal High
Tow Position
Tow Ring
Automatic back
release. Check
before every
launch.
If pulling the towline release handle fails to release the towline, cycle release handle and try again several times.
If handle still fails to release, fly over winch/auto and allow the back release to function.
Figure 7-13.Testing the towhook.
Figure 7-12. Boxing the wake.
7-12
GROUND LAUNCH TAKEOFF
When ground launching, it is essential to use a tow
hook that has an automatic back-release feature. This
protects the glider if the pilot is unable to release the
towline during the launch. The failure of the tow release
could cause the glider to be pulled to the ground as it
flies over the launching vehicle or winch. Since the
back-release feature of the tow hook is so important, it
should be tested prior to every flight. [Figure 7-13]
GROUND LAUNCH SIGNALS
PRE-LAUNCH SIGNALS FOR GROUND
LAUNCHES (WINCH/AUTOMOBILE)
Pre-launch visual signals for a ground launch operation
allow the glider pilot, the glider wing runner, the
safety officer, and the launch crew to communicate
over considerable distances. When ground launching
with an automobile, the glider and launch automobile
may be 1,000 or more feet apart. When launching with
a winch, at the beginning of the launch the glider may
be 4,000 feet or more from the winch. Because of the
great distances involved, members of the ground
launch crew use colored flags or large paddles to
enhance visibility as shown in Figure 7-14.
When complex information must be relayed over great
distances, visual pre-launch signals can be augmented
with direct voice communications between crewmember
stations. Hard-wired ground telephones, two-way
radios, or wireless telephones can be used to communicate
between stations, adding protection against premature
　
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