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PF = Patrol Escorts, or Frigates.

Ten "River" class anti-submarine ships (originally called "corvettes" and later "frigates"), then on order in a Canadian shipyard for the British Royal Navy, were transferred to the U.S. Navy in February 1942. These vessels were originally classified as corvettes and numbered in the "gunboat" (PG) series by the USN, and accordingly assigned hull numbers PG-101 through PG-110. The first two were placed in commission as such in December 1942, and the remaining eight were returned to the Royal Navy under "Lend-Lease". A hundred similar ships, modified to American specifications, were ordered from U.S. shipyards under Maritime Commission contracts. These were initially assigned hull numbers PG-111 through PG-210.

On 15 April 1943, the U.S. Navy changed the classification of the first two Canadian-built ships, and of all those planned for construction in the United States, to "patrol escort", or "frigate", with numbers assigned in a newly-established PF series. PG-101 and PG-102, already in commission, became PF-1 and PF-2. The rest became PF-3 through PF-102, of which PF-3 through PF-71, PF-93, PF-94 and PF-99 through PF-102 were commissioned for U.S. Navy service, generally with crews provided by the U.S. Coast Guard. Four more (PF-95 through PF-98) were cancelled before being laid down. Twenty-one (PF-72 through PF-92) were turned over to Great Britain while building, with only PF-72 ever having a U.S. Navy name assigned. Twenty-three PFs were loaned to the Soviet Navy in 1945, following USN service, and several others were briefly employed by the U.S. Coast Guard in 1946.

The U.S. Navy regarded these rather "low-tech" ships as a strictly wartime expedient. In 1946-1947 nearly all of them were disposed of by sale to other nations' navies and civilian users or as scrap. With the exception of one wrecked in 1948, those loaned to the Soviets were returned in 1949 and laid up pending disposal. Returned to service during the Korean War, some recommissioned as U.S. Navy ships before all were transferred to South Korea, Japan, Thailand and Colombia in 1950-1953. A few of the Korean frigates remained in the U.S. Naval Vessel Register for nearly two more decades, though this was essentially a legal formality.

PF-103 class Patrol Escort Vessel

The Cold War begat another six ships with "PF" numbers, all built for foreign navies to a basically Italian design. Four (PF-103 through PF-106) went to Iran in 1964 and 1969. PF-107 and PF-108 were delivered to Thailand in 1971 and 1974. The "PF" designation enjoyed a short-lived, and probably final, U.S. Navy reappearance with the initial hull number assignments of what became the Oliver Hazard Perry class guided-missile frigates. Planned as PF-109 through PF-112, the first ship was actually laid down under that designation shortly before they became FFG-7 through FFG-10 in mid-1975. Their numerous sisters were FFGs from the beginning.





Displacement: 885 long tons (899 t) standard 1,172 long tons (1,191 t) full load
Length: 275 ft (83.8 m)
Beam: 33 ft (10.1 m)
Draft: 14 ft 1 in (4.3 m) (sonar dome)
Propulsion: 2× Fairbanks-Morse 38TD8-1/8-9 diesel engines, 2 shafts 5,250 hp (3,910 kW)
Speed: 20 kn (23 mph; 37 km/h)
Range: 2,400 nmi (2,800 mi; 4,400 km) at 18 knots (21 mph; 33 km/h)
Complement: 15 officers, 120 enlisted

Bayandor class

The Bayandor class comprise four Iranian Patrol Frigates originally built for the US Navy as the PF-103 class . These Patrol Frigates were built in Texas under the MAP (Mutual Assistance Programme), wherein ships were built from US Navy funding and transferred immediately upon completion to allied navies.Two half-sisters serve in the Royal Thai navy.

In 1964-1965 first two ships transferred to Iran Navy. F-25 Bayandor PF-103 and F-26 Naghdi PF-104

Weapons and sensors

-1xAN/SPS-6C 2D air search radar,
-1xRaytheon 1650 navigational radar
-1xSQS-17A hull-mounted Sonar
-2xsingle 3 inch/50 calibre Mk 34 automatic anti-aircraft guns
-1x twin Bofors 40mm/L60 gun,1xHedgehog anti-submarine mortar
-2xMk6 K-Gun Depth Charge Gun and 1xMK9 Depth Charge Rack






In 1968-1969 last two ships transferred to Iran Navy, the bridge have a big nose and ??(i don't know the name of 2 antennas). F-27 Milanian(PF-105) and F-28 Kahnamoie(PF-106) war loss during the Iran-Iraq war



i can't found the pictures of PF-105 and PF-106 with iran navy flag

Other versions status work in progress. I will update after finish.

-Bayandor class refit 1982 during the Iran-Iraq war with ZU-23 Anti-Aircraft Twin Autocannon. i can't found this version pictures and do you have ZU-23 part ?

-Bayandor class refit 1990 with Oerlikon 20mm

-FF Naghdi Refit 2011 with Fajr-27 76mm Dual Purpose Gun and C-802 anti-ship cruise missiles

-FF Bayandor Refit 2013 with Fajr-27 76mm Dual Purpose Gun new version and C-802 anti-ship cruise missiles

-Tapi Class Royal Thail Navy (PF-107 and PF-108)

-Tapi Class Refit 1983

Wow! A fantastic work, and I'm looking forward to see further updates to this thread!

Agreed, fantastic work. You're doing great work on these smaller frigate-type vessels. Can't wait to see the others as this thread develops.

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Another one of those nearly forgotten and not very "sexy" series of ships. Excellent work.

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Would you please not eat my gun...

EXCELLENT stuff! - Nice work Superboy

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Excellent work, well done!

I adjoin the other comments, exelent, exelent. Indeed cannot wait for seeing the Thai versions as well.

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Excellent work!