(above full draft waterline)

Top of .50 caliber gun tub - 11 foot 6 inches

Top of the radar mast - 16 foot 9 inches

- FOREPEAK
     The forepeak was used as a storage area and access to this compartment was through the forepeak hatch located just forward of the pilothouse and in the main deck.
- CREW QUARTERS
     The crew quarters contained berthing for three personnel, storage area for personal equipment and a head.   Access to the crew quarters was through either the escape hatch located on the forward main deck or the ladder down from the deckhouse.
- PILOTHOUSE
    The pilothouse was equipped with the necessary controls and indicators to operate the propulsion engines, ac diesel generator, two .50 caliber machine guns (located in the gun tub mounted in the aft center overhead), electrical systems and to navigate the PCF.   Access to the compartment was through either port or starboard hatches to the main deck or the ladder up from the deckhouse.   Nine fixed windows were mounted in this compartment.   A CO2 fire extinguisher was located in the pilothouse.
- DECKHOUSE
     The deckhouse contained berthing for two personnel; galley area with griddle, refrigerator and reefer, sink; radio/radar area with three radios; small arms locker; storage cabinets and two CO2 fire extinguishers.   Access to the deckhouse was through the main deck hatch on the aft end of the deckhouse, the ladder down from the pilothouse or the ladder up from the crew quarters.   Four operable windows, two on each side, and a single, fixed window in the aft main deck hatch, were mounted in this compartment.
- STOWAGE COMPARTMENT
     The stowage compartment contained ammunition storage, the forward fuel tank and the two engine control units.   The remaining space was utilized for storage. Access to the compartment was through the bilge hatch located in the deckhouse, under the ladder going up to the pilothouse. Three access hatches were provided in the deckhouse, one for the forward fuel tank and two for the ammunition boxes.
- ENGINE ROOM
     The engine room housed the two propulsion engines, ac diesel generator, 2-24v battery sets, storage access for service manuals and tools, exhaust systems for the engines and generator, a five-gallon lube oil can, piping necessary for the bilge system, engine and generator seawater cooling systems, fuel system, 24v dc source of power switch and the ac source of power switch. Access to the engine room was through two hinged hatches on the main deck just aft of the deckhouse.
- LAZARETTE
     The lazarette housed the two aft fuel tanks, fresh water tank, steering gear, rudder tillers and two five-gallon lube oil cans.   Access to the lazarette was through an access hatch located on the aft port corner of the aft deck.   Two soft-patch hatches, on the aft deck, were provided for access to the fuel tanks.

The hull and superstructure were of all-welded, 1/4 inch aluminum alloy construction.

All deck plating, bulkheads, and other structural members were 5086-H321 aluminum alloy for both sheets and plates.  All extrusions were made using 5086-H311 aluminum alloy.

Four magnesium anodes were located on the stern, below the water line, and provided the means for reducing underwater electrolytic corrosion.

Vietnam : deck gray with varying amounts of black added, white mortar box lid and a large white star, in a blue circle, on the pilot house roof

Riverine: dull green with black camouflage patterns - authorized in May 1970

- 6.0kw Onan, model 6MDJB-3R, 120 volt, 50 amp, AC generator, water cooled, used on the later boats and retrofitted to the early boats during major overhauls (this allowed the use of all AC electrical equipment at one time)

AN/URC-58 SingleSideBand radio, 2 to 15 Mhz, could operate on upper sideband, lower sideband, AM or CW.   Output was 100 watts.   This was the PCFs primary communications equipment and was used to guard the M/T reporting net (S-3) for long range - boat to base communications.  This radio normally operated on 120 volts DC power but could be operated on 24 volt DC if necessary.  PCFs 17 and above, had a remote speaker and microphone installed in the pilothouse.

AN/PRC-10/25 FM, 30.00 to 79.95 Mhz portable field radio (used by off boat inspection parties and to coordinate with other units ashore).

AN/PRC-41 UHF portable radio (surface to air communications).  Installed on all boats between March and May 1969, prompted by aircraft sinking of PCF-19 in June 1968.

AN/URC-4 Survival/Emergency radio

PSYOPS warfare amplified loud-hailer system, AN/UIH-5, included both a microphone and tape recorder, range of approximately 1800 yards, and were installed during 1967, in concert with the removal of the top mounted searchlights.

Hand held observers magnetic compass

6 inch portable search light - visible at 4 mile range, when used from the guntub

Spotlight - used to illuminate targets at 250 to 300 yards range, mounted on pilothouse roof and controlled from inside the pilothouse by the boat driver

     - High Explosive w/Point Detonate fuse - 80 rounds

     - White Phosphorus w/Point Detonate fuse - 15 rounds

     - Proximity (Variable Time) fuse - 8 per boat

- various crew member weapons, to include: M-60 machine guns, M-79 grenade launchers with (illumination, high explosive, flechette and 00 buckshot) rounds, M-14 and or M-16 rifles, 12 gauge Ithaca riot gun, .38 caliber or .45 caliber pistols, various types of hand grenades (fragmentation, concussion - M3A1, thermite and red, yellow and green smoke), very pistols (flare gun) and at times, some C-4 explosive.

In May 1968, action was taken to provide protection for mount 51 and the fantail of the PCF.  Flack jackets were initially draped over the fantail lifelines and air crewman armor was installed around mount 51.  In May 1969, 25 sets of fantail armor protection (3/8" thick, fiberglass/ceramic armor, Bonded Woven Roving), was installed on PCFs involved in riverine operations.

There were no fuel transfer pumps.  PCFs 1 -16 engines could draw fuel from their own tank or the centerline tank.  PCFs 17 and higher could draw fuel from any tank.

@1000rpm - 9.8 knots - 10 gallons per hour - 780 nautical miles - 80 hours endurance

@1200rpm - 11.2 knots - 18 gallons per hour - 600 nautical miles - 44 hours endurance

@1400rpm - 13.6 knots - 20 gallons per hour - 540 nautical miles - 40 hours endurance

@1600rpm - 17.6 knots - 28 gallons per hour - 400 nautical miles - 28.5 hours endurance

@1800rpm - 20.5 knots - 50 gallons per hour - 320 nautical miles - 16 hours endurance

@2000rpm - 23.5 knots - 75 gallons per hour - 250 nautical miles - 10.7 hours endurance

Actual engine RPM versus speed data varied widely from boat to boat depending on the type of fuel used, loading of the boats, and calibration of the remote engine tachometers.  

The height of the sea significantly curtailed the speed capabilities of the PCF.

This effect varied with the course of the PCF relative to the direction of the seas.

Average estimates of the most limiting conditions on a PCF, heading directly into the seas, without violent pounding, are listed below:

0'-2' seas, 0-12 knot wind, 1850 max RPM, 21.0 knot speed, 21.0 knot speed over all

3'-4' seas, 12-15 knot wind, 1200 max RPM, 11.2 knot speed, 10.5 knot speed over all

5'-6' seas, 15-18 knot wind, 600 max RPM, 6.3 knot speed, 4.5 knot speed over all

Note:

All deck plating, bulkheads, and other structural members were 5086-H321 aluminum alloy for both sheets and plates.  All extrusions were made using 5086-H311 aluminum alloy.

Two magnesium anodes were located on the stern, below the water line, and provided the means for reducing underwater electrolytic corrosion.

Bow height was raised by one (1) foot and the pilothouse was moved aft by approximately three (3) feet, from the Mark I construction plans design