Dropping angle
RESTRICTED
Tan
LA
opposite divided by the
adjacent side.
See
pg.
105
Angle A is the dropping angle, the actual
range angle and sighting angle. Only at the time
of bomb release are the dropping angle, sighting
angle and actual range angle equal.
it a bombing problem is preset into the sight,
the
following
information must
be known.
Altitude
Type of
Bomb
Calibrated Indicated Air Speed
Trail
Velocity of Closing
If the actual time of fall is 20 seconds and
the velocity of closing
is 300 feet per second,
whole range is 6000
In other words, the
plane would travel 6000 feet from the time of
release to tre
time of bomb impact, provided the
airplane continued to fly the same
course and at
the same speed after bomb release.
All bombs wii: trail the plane a certain dis-
above bomb had 70 mils trail or
420 feet,
actual range would then be 5580 feet, or
whole range minus trail.
Actual range is the
tance, measured horizontally along the ground on
the collision course that the bomb will travel on
its flight through
the air.
If the angle which will subtend 5580 feet is
determined, the equation would be
Tan
LA
5580 =
6000
• 9300
scouted not trice approximately lue
computed.
That value
55'.
If all the data is correct,
then
if the tele-
scope
quadrants
positioned at the
droppina ancle of 420
55 and the bomb released
107