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|  MIL-W-15805F(SHIPS)
when energized. Readily replaceable gears shall
3.4.4.4 Wind direction mechanism. - The wind
direction mechanism shall be a subassembly con-
provide for a chart speed of 6 inches per hour.
sisting of a synchro receiver driving the pen, and
3.4.4.14 Drive roll.- The drive roll shall have
miscellaneous parts and adjustments as required.
three sets of chart drive pens around the roll with
3.4.4.5 Accuracy. - The static error at all posi-
center to center spacing of the sets 5.125 inches
ions of the pen shall not exceed plus or minus 4-
0.010 inch. The drive roll shall be driven through
degrees.
a friction slip clutch, and shall have an adjusting
wheel on the right.
3.4.4.6 Synchro - The synchro shall be a torque
transmitter conforming to type 1 F of MIL-S-2335.
3.4.4.15 Chart drive motor. - The chart drive
The synchro shall be mounted by its mounting flange
motor shall be a synchronous motor operated at 1
with a positive clamping arrangement allowing ad-
revolution per minute when energized from a 60-
justment of not less than 360 degrees. The synchro
cycle power source. Its torque shall be not less
mount shall allow the synchro to be replaced without
than 30 inch-ounces, when operated from 120 volts.
loosening or removing the wind direction mechanism
3.4.4.16 Reroll spool. - The reroll spool shall
from the case. The synchro shall be coupled to the
open drive through a gear reduction. The synchro
have a slot for starting the roll. The rerolled
hall have a zero adjustment with a range of 26.5
chart shall be readily removable from the chart
plus or minus 5 degrees.
drive mechanism.
3.4.4.7 Chart scale. - The scale for the wind
3.4.4.17 Reroll motor. - A reroll motor shall
direction mechanism shall have an associated scale
be provided. The reroll motor shall be de-energized
calibrated 0 to 360 to 180 degrees in 10-degree in-
automatically when the reroll spool is removed.
crrements. Major calibration marks shall be at
multiples of 30 degrees, and 90-degree intervals,
3.4.4.18 Chart - The chart shall be 10 3/4
inches wide by 100 feet long. The chart shall be
3.4.4.8 Wind speed mechanism. - The wind
printed on white paper and shall have two sets of
peed mechanism shall be a subassembly consisting
red or orange calibrations, wind direction on the
of synchro receiver driving the pen, a pen reposi-
left, and wind speed on the right. The calibrations
tioner, and miscellaneous parts and adjustments as
shall match the scales, and shall be numbered at
required.
intervaIs of 6 inches. The direction calibration
shall be 4.513 inches wide, and the speed calibration
3.4.4.9 Accuracy. - The error of the wind speed
shall be 4.500 inches wide. The two sets of calibra-
mechanism shall not exceed that shown in 3.3.2.
tions shall be separated by 0.375 inch 0.010 inch.
There shall be three rows of drive holes, a row of
3.4.4.10 Response - The response of the wind
round holes on the centerline of the chart, and a
peed recorder shall be within the limits shown in
row of holes, elongated in the width direction, near
.3.2.
each edge. The distance between centerlines of
the holes shall be 5.15 inches and 0.5 inch.
3.4.4.11 Chart scale. - The chart scale for the
wind speed mechanism shall have an associated scale
3.4.4.19 Time calibration. - The chart calibra-
calibrated from 0 to 100 knots in 2-knot increments.
tion shall have red arc lines corresponding to the
Major calibration marks shall be at multiples of 10
pen arcs at 0.5-inch intervals on the length of the
nets, and identifying numbers at intervals of 20
chart. Every sixth arc shall be heavier, and shall
nets.
be identified with time in l-hour increments in the
12-hour system. The chart shall have the remain-
3.4.4.12 Chart drive mechanism. - The chart
ing lengths marked in feet at l-foot intervals.
rive mechanism shall be a subassembly consisting
f a chart supply bin, a chart drive roll driven by a
3.4.5 Crosswind-headwind computer. - The
synchronous motor, a reroll spool driven by a stalled
crosswind computer shall be manufactured in ac -
reduction motor, and mechanical parts and electrical
cordance with Drawing 3331266. The crosswind
arts as required. Not less than 6 inches of the
computer shall be contained in a dripproof enclosure
latest recorded chart shall be visible. The chart
designed for bulkhead mounting the mechanisms
rive mechanism shall accept ships standard 115-
necessary to convert the output signals from the
volt, 60-cycle power.
wind direction and speed transmitter into two d.c.
voltages proportioned to the headwind and crosswind
3.4.4.13 Chart speeds. - The chart drive mech-
components of the relative wind for both straight
anism shall advance the chart at 3 inches per hour
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