Cradle differential lever
RESTRICTED
M. Cradle
Differ-
entiai
Lever
Fig. 35
N. Cross
Trail
Mech-
an i sm
Fig. 35
cardan
through the telescope gudgeon bearing and
is stabiiized transversely by the cradle connect-
ina rod from the gyro casing.
This connecting rod
keeps the
cradle always parallei to
the gyro
except as modified by the cross trail correction.
The optical system consists
of a one-piece-
refracting telescope of 1.5 power.
This telescope
requires no maintenance
the field and if any-
thing goes wrong with
it it must be returned to
the depot for repairs.
Mounted on the rear of the cradle is the
cradle differential
lever, to which are
connected
two connecting
the cradle connecting rod
(gyro connecting rod)
from the gyro casing
the cross
connecting rod (C.
T. link)
cradle differential lever
the cross trail clamp
The cradle connecting rod tends to main-
tain the cradle
vertical axis parallel to the gyro
verticai axis in
transverse direction.
trail connecting rod
tilts the
cradle ver-
tical axis transversely with
respect to the ver-
gyro as
required by the amount of cross
trail correction.
The cross trail mechanism of the M-3 consists
of the following:
knob, yoke, eccen-
tric disc,
eccentric stud, sight stem,
trail carriage, cross
dove tail,
trail clamp lever,
cross trail clamp lever turret head screw,
trail connecting
-od, cradle differential lever,
telescope and
telescope cradle.
The purpose of the cross
trail mechanism is
to tilt the telescope through
an angle that will
subtend cross trail distance on
the ground.
when the cross trail knob is rotated counter-
clockwise the yoke moves the eccentric disc back
from
the center of
the dove tail
a distance pro-
portional to trail. The dove tail is a part of
the sight stem.
The eccentric disc fits over the
dove
tail
and
slides fore and aft on it. The dove
must always
be parallel to the fore and aft
axis of
stabilizer and the stabilizer must be
fore and aft axis of the airplane.
eccentric disc moves aft, the eccentric
stud, riding in
the slot of the cross trail car-
riage, will
move the cross trail carriage in
trans-
lation
transverse direction either to
right or left.
Any transverse movement of the
cross trail carriage will tilt the telescope. If
77