The Norden Bomb Sight manual

stabiiizer change in

relation to each other.

Thus

if the plane turns

azimuth independently of

the sight, or the sight is turned independently

the plane, the cross trail carriage (and optics)

will move.

The construction and operation of the

knob assembly and how

fore and aft hair is

stabilized

in azimuth should be understood. The

stabilizer gyro through the bombsicht clutch

Stab 2ed sector 120 m

sta-

The

with the turn worm

(a part of the course knob assembly), and

imparts

its stabilization to the turn

Since

the

turn worm is an

integrall part of the bombsight

case, the entire bombsight is stabilized in azi-

muth.

there is the relationship

between three distinct azimuth headings that

First there is the azimuth head-

ing of the longitudinal axis of the plane. Second

there

is the actual line of flight of the plane.

This latter is also the ground track.

The angle

these two azimuth headings is of course

the drift angle. Third

there is the azimuth head-

ings of the fore and aft hair, i.e. azimuth

head-

ing of the line of sight. If

azimuth

heading

of the line of sight is not exactly

same as

that of the line of

flight, then drift is still

present and before a course can be set up and HELD

necessary to "kill drift"

In every case

the azimuth heading of

both the line of sight and

the line of flight must be the same or parallel.

Causes

of De-

flection

Errors:

A. Dove-

tail

Misal-

igned

The dovetail is misaligned when its fore and

aft axis is not parallel to the

fore and aft axis

With zero drift the transverse

axis of the bombsight case will be at 900 to the

fore and 'aft axis of the stabilizer.

Naturally

with

zero drift reading,

there should be no tilt

in the optics.

With the

trail setting in the C.T.

in

of

the

bilizes

stabilized

sector

in

stabilized

sector

is

meshed

As

regards

should

be

known.

between

the

the

it

is

of

the

stabilizer.