Comments by "Sar Jim" (@sarjim4381) on "Flower class - Guide 124" video.
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The USN officially received nine Flower class corvettes from Canadian dockyards and ten directly from RN service in 1942 and early 1943, all to fill in dire shortages of convoy escorts across the Atlantic and from the Caribbean to New York and Canada. The British built ships served as transatlantic convoy escorts through early 1944. Eight Canadian built vessels actually served in the USN while one, USS Beacon, assigned to the USN and commissioned as a USN ship, never actively serving. She was transferred the RN as the HMS Dittany in May, 1943.
These modified Flowers were classed as patrol gunboats in USN service, a role the Canadian built ships actually performed. All eight vessels escorted coastal convoys up and down the US coast, to and from the Caribbean and sometimes as far north as Newfoundland.
The British built ships were taken in hand as soon as they could get to a US dockyard. The British 4" was replaced with US 4"/50 and the aft Vickers 2 pdr pom pom or twin Lewis guns replaced with a 3"/50. The other Lewis guns were either replaced or augmented with 20mm Oerlikons. The Canadian built ships came with a standard armament of two 3"/50 and 2-4 20mm guns.
The USS Pert, maintaining the USN tradition of placing a gun everywhere there was an empty space, had, in addition to the 3" guns, at least seven 20mm, three twin Lewis gun, and a single Browning M2 .50 caliber machine gun mounted on top of the bridge. There was a good reason for all these gun, beyond the enjoyment US sailors took firing guns. Coastal convoys were often attacked by U-boats running on the surface. Because the PGs retained their British Type 271 radar, the rest of the war up to about 1944, they were able to detect submarines up to 3,500 yards, or about 2 miles. This was often more than the U-boat lookouts could see in the typical haze and fog of the coast, especially at night. Once detected, the PG would call for flank speed and charge the U-boat with guns blazing, the hail of fire forcing the U-boat to dive with alacrity. Once it was down, the PG would track the sub with its ASDIC (also British) and hold it down until faster escorts could arrive to attack it. The PG would then sprint back to the convoy and take up the escort role again. U-boats attacked East Coast convoys in wolf packs, and each PG would often have to perform their cavalry charge attacks five or six times during a single escort voyage. The little PG/Flower class corvettes were roundly hated by US sailors for the rolling Drach mentioned, lack of berthing accommodations, and the constant wetness of the ship. Since the ships were built with North Atlantic duty in mind, one can only imagine the torture of being below decks in tropical waters. Nevertheless, the plucky little ships plugged a hole in US escort capabilities during the first two years of the US war, and their presence saved many a merchant ship and the lives of many merchant sailors.
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