6101. General.-During wartime there will be two conditions of readiness of the armament: Ready condition and fully ready condition. The armament may be in the ready condition when boats are under repair, secured, moored to a dock or on training runs when action with the enemy is not probable. On any occasion where action with the enemy is probable, the armament will be in the fully ready condition and partially or fully manned, depending on the circumstances and on the mission on which engaged. In placing the armament in the fully ready condition extreme care must be exercised inside the harbors or other areas where own or friendly vessels may be endangered by accidental discharge of weapons.
6102. Battle stations.
GENERAL QUARTER-CONDITION 1
Boat captain-Conn: Wheel or throttle.
Executive officer-Throttle or wheel.
GM-Oerlikon gun.
Tm-Stand by torpedoes or depth charges.
QM-Ammunition passer for .50-caliber guns.
RM-Radio.
MM-Engine room. MM-Starboard .50-caliber guns.
MM-Port .50-caliber guns.
Sea-Loader for Oerlikon-gun.
NOTE.-The above may and should be changed to utilize special aptitude or training of any man.
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CONDITION 2
Station
Watch 1
Watch 2
Conn
Captain
Executive Officer.
Communications and navigation
RM
QM.
Wheel, torpedoes
TM
GM.
.50-caliber guns
SC
MM.
.50-caliber guns
Sea
Engine room
M M
M M.
6103. Torpedoes-Ready condition.
1. Preliminary and final adjustments.
2. Charged to between 2,000-2,800 lb. per sq. in.
3. Warhead attached, exploder and booster in.
4. Two brass stop pins in place.
5. Tubes trained in, not secured.
6. Firing keys in commanding officer's key locker.
7. Impulse charges in provided stowage.
8. Director mounted and cover on.
9. Canvas muzzle bags on tubes.
6104. Torpedoes-Fully ready condition.
1. Tubes trained out and secured in that position.
2. Current on firing circuit.
3. Impulse charges loaded, firing pin on "safe".
4. Firing keys inserted.
WHEN ACTION IS IMMINENT
1. Shift firing pin to firing position.
2. Men standing by tubes with mallets for percussion fire.
6105. .20-mm. gun-Ready condition.
1. Gun oiled and ready to fire mechanically, uncocked.
2. Gun cover on and not secured except in wet weather.
3. Magazine filled and in ready boxes. Extra magazines filled and on board.
6106. .20-mm. gun-Fully ready condition.
1. Gun cocked; should be uncocked for a few minutes every four hours when weather permits.
2. If weather is wet, cover over magazine and breech mechanism, not over muzzle.
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3. Safety on until ready to commence firing.
4. Magazine in place.
5. If weather permits gun manned continuously. If not gun secured pointing up.
6107. .50-caliber gun-Ready condition.
1. Guns clean and well oiled.
2. Oil buffers filled.
3. Head space set.
4. One thousand rounds up in each turret well cleaned and free from corrosion; not led up to gun.
5. Spare magazines loaded and at hand in tank room.
6. Waterproof cover on and secured only in wet weather. Normally off during daylight. Covers on, not secured at night.
6108. .50-caliber gun-Fully ready condition.
1. Lead belt up to gun, half load, put on safety.
2. If weather is wet, keep muzzle bags on guns, cover over turret.
3. Guns manned, trained on bow or probable target bearing.
6109. .45-caliber submachine gun-Ready condition.
1. Gun well oiled, cleaned and adjusted for firing.
2. Gun secured to port inside bulkhead of lower control station.
3. All magazines loaded and secured close to guns.
4. Magazines never to be installed until ready to open fire.
1. Removed from stowage and in hands of gunner.
2. Magazine at hand, ready to be loaded.
3. Gun cocked; safety on.
6111. Depth charges-Ready condition.
1. Pistols, extenders, detonators, and boosters installed.
2. Knobbed safety forks in place, not wired to rack.
3. Plain safety caps on.
4. Depth setting "safe".
5. White lines painted at 50 feet, 100 feet, 200 feet, 300 feet setting.
6. Depth charge howler operative.
7. Safety fork and toggle pin tripping gear in place.
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8. Knobbed safety cap with lanyard attached will be kept on each boat, ready for installation.
6112. Depth charges-Fully ready condition.
1. Replace plain safety caps with knobbed safety caps secured to racks. Do not wire safety forks to racks.
2. Depth settings are set as directed by boat captain after clearing port.
6113. F. S. generator-Ready condition.
1. Generator filled.
2. CO2 bottle charged.
3. Toggle pin in place on releasing handle, safety fork on toggle pin.
4. Releasing arm lashed with fish line to smoke tank ring.
6114. F. S. generator-Fully ready condition.
1. Same as "Ready".
CHAPTER 1. (B)
6115. .20-mm. gun data.
1. Rate of fire (not adjustable)-450 rounds/minute.
Muzzle velocity-2,725 feet/second.
2. Maximum depression, 5°. Maximum elevation, 87°.
Range 4,734 yards.
Maximum ordinate 3,840 feet 3,020 yards from gun.
Time of flight 31.74 seconds.
6. 50 percent zones.
Range
Length
Breadth
Height
Drift
Yards
Yards
Yard
Feet
Yards
500
30
1
1
1
1,000
30
1
1
2
1,500
30
1
1
4
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7. Superelevation.
Range
Angle of superelevation
Angle of elevation of line of sight
0
30
45
60
Yards
500
0°13'
0°11'
0° 9'
0° 6'
1,000
0°42'
0°36'
0°30'
0°21'
1,500
1°31'
1°19'
1° 4'
0°46'
It should be noted from the above that the Oerlikon characteristic makes for greater accuracy at high angles of fire.
8. Life of barrel.-The amount of life that a barrel will give, depends on how hot the barrel becomes during firing.
Five magazines, containing 60 rounds each, or a total of 300 rounds can be fired continuously without harm to the barrel.
Nine magazines, of 60 rounds each, or a total of 540 rounds, will cause serious wear if fired continuously.
If short pauses occur between the firing of each magazine, the wear will remain small, even after several thousand rounds.
During any prolonged firing, the barrel should be kept as cool as possible, either by frequent changes with the spare barrel, or by dousing the barrel with water.
6116. .50-caliber B. A. gun data (air cooled).
1. Rate of fire-500-650 rounds/minute-adjustable.
Muzzle velocity-(78 feet from muzzle).
4. Number of rounds first burst and subsequent bursts. An initial burst of 75 rounds may be fired, after which 20 rounds a minute may be fired. After waiting 15 minutes without firing, another 75 round burst may be fired. If an initial burst of only 25 rounds is fired, 25 rounds a minute may be fired continuously. The above rate of fire prevents overheating the gun, impairing its accuracy, and reducing its life. However, in combat the gun may and should be fired without regard to this.
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CHAPTER 2. MISCELLANEOUS DATA
A. Fuel Consumption and Cruising Radius
6201: One engine operation.
TABLE 1.-Fuel consumption and cruising radius, one engine,
Admiral, (29/30) wheels
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6202. Two engine operation.
TABLE 2.-Fuel consumption and cruising radius, two engines,
Admiral, (29/30) wheels
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6203. Three engine operation.
TABLE 3.-Fuel consumption and cruising radius, three engines,
Admiral, (29/30) wheels
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6204. Composite table of all combinations.
TABLE 4.-Gasoline consumption with Admiral (29-30) wheels -77'