Time of bomb release
RESTRICTED
In Fig. 68. the three relationships upon which
time of bomb release depends are shown.
The rate
quadrant does not drive.
it is moved
from zero
tangent
function counter clockwise simpiy by rota-
ting the ate knob, and when moved counter clock-
wise it w!!:
assume a position stationary, when
knob action
ceases) closer to
the oncoming
telescope quarant.
The ielescope quadrant is
moved
from zerc sighting ancie to maximum sight-
ing angle by moving the telescode quadrant counter
clockwise.
The counter clockwise movement of the
telescope cuadrant is accomplished by rotating
either the displacement or search knob.
The tele-
code motor wi:! drive
the telescope quadrant
only
in a clock*ise direction,
i.e. toward the
quadrant or toward zero.
Causes of
Range
Errors.
A. Causes
of
Improper
Positioning
of Rate
Quadrant.
Roller not zeroed, l.e. roller above
or
disc center with zero
rate and zero trail.
After
trail has been
set in,
roller wil! rest higher (if
above
center) than it should upon the disc.
rate mechanism then takes the
roiler up the rest of
the distance
to point of synchronization.
If the
roller were above center of the disc
with zero value for trail and
rate).
the displacement of
the roller by
the rate mechanism will be less than
it should be and wil! therefore not
bring the rate quadrant downward to-
ward the oncoming telescope quadrant
as far as it should, and therefore
a later release
will not strike the target;
there
will be an "over".
If the roller
were below the center of the disc
zero ve lue for trail and rate),
the displacement of the roller by
the rate mechanism would have to be
moreto place the roller at the point
of synchronization and thereby pos-
ition the rate quadrant at a great-
rate
rate
below
the
The
results.
The
bomb
(with
211