Weapons
Preparation
PREPARATION
Being able to drop ordnance onto a target depends largely on factors present at the target, factors
which vary from day to day. Because of this variability, you are expected to prepare the following
items for each flight brief.
DETERMINING DELIVERY DATA
The T-45C NATOPS manual contains delivery charts for MK 76 bombs (example shown in Figure 1)
and 2.75" Folding Fin Aircraft Rocket (FFAR) rockets. These charts are used to find the correct
sight settings and release attitudes for each specific pattern. Twenty-degree bomb delivery data has
been interpolated from these charts and is available on page 24. Target elevation must be added to
the release altitude to find the correct release MSL altitude.
T-45 DELIVERY DATA
MK 76 MOD 5 PRACTICE BOMB
450 KTAS
RELEASE RELEASE
TIME
TRAJECTORY
ANGLE
PARALLAX
DOWN
SLANT
SIGHT
FLIGHT
ALTITUDE
OF
RANGE
RANGE
ANGLE
DROP
OF
PATH
FALL
TRAVEL
ATTACK
(DEG)
(FT)
(SEC)
(FT)
(FT)
(MIL)
(MIL)
(MIL)
(MIL)
0
9
90
98
3063
2956
4.2
800
-10
0
9
98
107
3344
3220
4.6
900
0
9
106
115
3613
3472
5.0
1000
0
9
114
122
3872
3712
5.3
1100
0
9
121
130
4121
3943
5.7
1200
-30
0
7
119
126
5006
4008
6.7
3000
-45
0
4
115
119
6382
3968
8.2
5000
1. SINGLE WEAPON DELIVERY AT SEA LEVEL TARGET.
2. RELEASING THIS DATA DOES NOT CONSTITUTE A CLEARANCE.
Figure 1: WEAPONS DELIVERY TABLE
COMPUTING OFFSET AIMPOINT
To compute an offset aimpoint, you must know the magnitude and direction of the wind at release
altitude (reported or forecast), and the time of fall of the weapon (see Figure 1). For each flight, you
must compute a separate offset aimpoint for each type of run you will be making. The direction of
the offset aimpoint is very simple: it is always directly into the wind. The offset distance (in feet) is
given by the following formula:
D = 1.7 X T X W
In this formula, T is the time of fall of the weapon in seconds, W is the speed of the wind at release
altitude in knots, and 1.7 is the factor that converts knots into feet per second. For example,
suppose that the wind is from the north at 12 knots and the weapon time of fall is 7 seconds. Using
the formula, D = 1.7 X 7 X 12 = 142.8 feet. So, your offset final aimpoint will be about 140 feet north
of the target. It is possible to compute an offset aimpoint in mils instead of feet, especially for use on
a non-raked target, but this method is not used in the Training Command. Therefore, you will be
expected to compute your offset aimpoints in feet rather than mils.
Page 3
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