Figure 3-16.Walleye guided weapon (typical).
The weapons are grouped into four basic
Basically, the guidance section of the weapon and
series-Walleye I (small scale), Walleye I extended
range data link (ERDL), Walleye II (large scale), and
Walleye II ERDL. Note that the Walleye II and Walleye
II ERDL weapons are larger in diameter and length and
weigh more than the Walleye I weapon. The Walleye II
ERDL weapon also has larger wings. A Walleye
weapon representative of each basic series is discussed
in this chapter.
WALLEYE I. The Mk 21 Walleye I tactical
weapon consists of a guidance section, a warhead
section (including the fuze and fuze booster), a control
section, four wings, and four fins. The weapon has
provisions for 14- and 30-inch suspensions, and an
ejector foot pad that is used to adapt the weapons to
various types of aircraft bomb racks. The Walleye I
(series) weapons are in the 1,000-pound class weapon
To form a typical attack situation, the weapon, pilot,
and aircraft must perform as a complete weapons
system. The weapon uses aircraft electrical power (via
an umbilical cable that connects the weapon to the
aircraft) from the time electrical power is applied to the
aircraft until the aircraft reaches a speed of
approximately 180 knots. The automatic power
changeover circuit in the weapon then switches the
weapon to ram air turbine (RAT) generator power.
the aircraft system form a closed-circuit television
system. A television camera mounted in the nose of the
guidance section provides a picture of the area forward
of the aircraft and displays this information on a
television monitor located in the cockpit of the aircraft.
Additional circuits provide a cross-hair grid on the
pilots television monitor, which is a pair of vertical and
a pair of horizontal lines. This intersection of horizontal
and vertical cross hairs (the square in the middle) defines
the tracking area.
By looking at the video scene
displayed on the television, the pilot is able to boresight
the weapon and aircraft to acquire the target, initiate
lock-on, and confirm weapon tracking.
After boresighting the weapon, selecting the proper
fuze option, and achieving satisfactory lock-on, the pilot
initiates release and escapes the target area. The weapon
continues to track the target until it reaches the point of
The Walleye I Mk 27 practice weapon is identical
to the Mk 21 weapon except for the warhead and control
sections. The warhead is entirely inert, does not contain
a fuze or fuze booster, and has ballast to maintain
weapon CG (center of gravity) compatibility with the
Mk 21 weapon. This weapon is used for captive-flight
pilot training and for aircraft loading and ground
handling training purposes.