The Norden Bomb Sight manual

DEFLECTION AND RANGE ERRORS

It has been stated that if the bombsight were

accurately calibrated and the bombardier properly

synchronized that the bomb would hit

the target.

However, unless the above is true there will exist

bombing

errors.

Some of the bombing errors most

freguently encountered are caused by

incorrect

calibration and setting in of bombing data.

deflection and range errors given below

are

all the possible errors but those most

frequentiy encountered.

DEFLECTION

ERRORS

A. Definit-

ions

Where the bomb strikes to either side of the

collision course,

the bombing errer, to that ex-

tent, is a deflection error

"right" or "left".

Where the bomb strikes to

either side of a line

perpendicular to the collision course and which

intersects the target, the bombing error,

to that

extent, is

error lover"

or sunder"

A

bombing error which is a combination of a deflect-

ion error and

a range error is called a circular

error.

8. Causes of

Deflect-

ion Errors

Normally deflection errors are attributable

to a tilt

the optics which is incorrect (either

tco great

or too small) for the given conditions.

However, defleciion errors may occur either because

the equipment

is so faulty it is impossible

"set up"

the proper course or else because the

operator's technique is so faulty that he cannot

"kill drift".

C.

Prereguis-

ites For

A thorough understanding should be had of

the construction

and operation of the cross

mechanism.

Any transverse movement of the cross

Standing of trail carriage in relation to the bombsight case

will cause a tilt of the

telescope cradle.

ion Errors

The transverse movement of the cross

carriage,

in relation to the bombsight case, will

occur when the

azimuth heading of the sight and

in

to

Deflect-

trail