Preparation
Weapons
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 kts, and 1.7 is the factor that converts kts into feet per second. For example, suppose that
the wind is from the north at 12 kts and the weapon's time of fall is 7 seconds. Using the formula, D =
1.7 X 7 X 12 = 142.8 ft. So, your offset final aimpoint will be about 140 ft 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.
RELEASE AIRSPEED/MACH NUMBER
Release airspeed is a true airspeed. The head-up display (HUD) in the T-45A has a true airspeed
readout, but as a backup, you need an indicated airspeed or mach number, whichever is easier to read
on your aircraft instruments. The HUD has an indicated airspeed and a mach readout, but a failure
affecting true airspeed would probably affect these readouts. Instrument panel indicated airspeed/mach
is a good backup for the HUD. If you want to use mach, you will have to compute it using the NATOPS
table.
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