Rate quadrant adjustment
RESTRICTED
3. Rough
Field
Check
C. Gyro,
Cardan and
Telescope
Assembly.
Telescope
and Cradle
Oiling.
A. Set rate quadrant at zero, and if ground speed
drum
indicator does
not point at zero,
screw
and reposition
it to zero.
1. If gears are unmeshed at drums, spring will
unwind.
This spring is merely
for the
purpose of
of taking up slack in the gear train.
back
takinout,
It is wound
about l ll2 turns at zero rate and ground
speed.
1. Check for zero roller.
2.
Divide the sight constant (M3 is 4580 and M6
is 5300 by the Actual Time of fall to get disc
speed).
3.
Set disc speed into the sight using a tacho-
meter.
Zero the trail arm.
5. Position the rate quadrant to set up any drop-
ping angle.
Place
the telescope quadrant behind the rate
quadrant indices and turn on telescope motor and
clutch
1. Start "stop" watch when
the indices of the
telescope and
rate
quadrants coincide.
8.
Then
check the time it takes the telescope
quadrant to reach zero on the scale.
9.
This time should
equal the Actual. Time of
Fall set in to the sight to within one-tenth sec-
ond.
10.
Repeat this procedure with rate quadrant in
two or three positions.
11.
In event
the actual time of fall does not
check, look
for the following difficulties:
(a) motor not driving constantiy.
(e) Tolse astifie nob brakes.
Oiling.
Check cradle gudgeon bearings for free-
dom of action.
clean,
If bearings are dirty, remove,
oil and replace.
Keep light film of oil on cross trail link
pin and also on gyro connecting rod pivot
pin.
C.
Cleaning.
a. Keep
sector gear and integral shaft
pinion free of dirt.
!oosen
6.
7.
Start
"stop"
watch
when
(c)
loose
altitude
knob
brakes.
Telescope
A.
B.
Divot
161