The Norden Bomb Sight manual

(9) Whole

Range

(10) Trail

(1I) Actual

Range

(12) Actual

Range Angle

(Dropping

Angle)

(13) Sight-

ing Angle

(14) Cross

Trail

(15) Drift

Angle

(16) Trail

Angle

"whole

Range is the distance that the

air-

plane would travel during the time of fall of the

bomb,

or from the time

of release to the time of

impact (provided

the airplane maintains its speed

course).

This distance may be computed by

multiplying

the ground speed by the time of fall.

Trail is the linear distance measured from a

point vertically beneath

the airplane at the in-

stant of impact to the point of the impact.

resistance to the forward and downward motion of

the bomb is the cause of trail.

Actual Range is the linear distance measured

along the ground from

& point vertically beneath

airplane at the time of release to the point

of impact.

This distance may be computed by sub-

tracting trail distance from whole range.

The angle between

the line of sight to the

target and the true vertical at the

instant of

release. Will subtend actual range distance upon

the ground.

The angle between the line of sight to the

traget,

ground

a any

vertical

the plane to the

instant.

At the time of release it

is equal to the Dropping or Actual range angle.

The distance a

side of the

and the fact

behind the

to tact at the

bomb falls to the

downwind

ground track due to the

drift angle

bomb always trails directly

airplane which dropped it.

Cross trail

is equal to the product of the trail in feet and

the sine of the drift angle.

The angle between the plane's heading and the

ground track.

*Trail

Angle" is the angle formed at the in-

stant of bomb impact by a line vertically beneath

the plane to the ground

and a line from

the plane

to the

point

of

impact

(at the instant of bomb

impact).