Tag Archives: S-2 tracker

Say hi to Lulu

Official caption: “Navy’s Atomic Depth Bomb Lulu. Lulu, is the nickname for the Navy’s atomic bomb displayed in the bomb bay of an S2F Tracker, while turning in flight, at Long Island, New York. Lulu is designed for fast accurate strikes against submarines by nearly all types of Navy aircraft. Its kill radius covers vast areas, giving enemy submarines a small chance of escape. The S2F, an anti-submarine warfare aircraft, also carries impressive underwing armament including four conventional acoustical-homing torpedoes and two high-velocity air rockets (HVARs). The photograph was released on December 30, 1960.”


Two “Lulu” atomic depth bombs in the bomb bay of an S-2 Tracker, photograph released January 4, 1961. USN 710854

Lulu was better known to the Navy as the Mk 101 Lulu. According to the Atomic Archive, it “was a small implosion-type nuclear depth bomb. The Lulu exploded at a depth and time that allowed the delivery aircraft to escape.”

Lulu carried the 11-kiloton W34 tactical nuclear warhead– which was also used on the Mark 45 ASTOR torpedo, and the Mark 105 Hotpoint nuclear bomb. When assembled, Lulu was just over 7-feet long, and weighed 1,200 pounds. It replaced the earlier Mark 90 “Betty,” a device some three feet longer that carried the 32-Kt Mark 7 warhead and was withdrawn from service by 1960.

“The Lulu atomic depth bomb is the Navy’s deterrent against the control of the seas posed by the huge Communist submarine fleet. Lulu is designed for fast, accurate delivery from nearly all types of U.S. Navy planes. Examining Lulu is Robert J. Goss, a project engineer at the Naval Ordnance Laboratory, Silver Spring, Maryland, where the weapon was conceived. The nuclear warhead was designed and developed by the Atomic Energy Commission.” January 17, 1961. USN 710853

“Explosion of Underwater Nuclear Device, October 1957. The Navy’s new atomic depth bomb “Lulu” was designed to be dropped from a US Navy plane on an enemy submarine lurking beneath the surface. The vast waterspout shown, reaching hundreds of feet into the air, dominates the horizon and dwarfs the instrumentation on ships and barges. Navy experts consider the new “Lulu” weapon a major element in the US defense against the menace of an enemy’s huge submarine fleet. “Lulu” was conceived and developed by the Naval Ordnance Laboratory, Silver Spring, Maryland, in collaboration with the Navy’s Bureau of Ordnance.” 80-G-709977

Besides Trackers and SP-5A/SP-5B Marlin flying boats, it was tested on tactical fixed-wing aircraft, such as the Skyraider. 

Lulu nuclear depth charge mounted aboard a Douglas AD Skyraider during tests, circa 1960. USN 1052478

Lulu was also rated for use by ASW helicopters.

Navy’s Atomic Depth Bomb “Lulu” on an HSS-1 (Sikorsky H-34 Seabat/Seahorse) Anti-Submarine Helicopter at Long Island, New York, December 1960. 330-PSA-1-61-1

The Mk101 Lulu was fielded from 1958 through 1971 and, once it was withdrawn, the only ASW nukes left in the fleet were W44/W55-tipped ASROC/SUBROCs that continued to serve until 1989, at which point the Cold War was declared over and peace ensued.

Warship Wednesday, June 2, 2021: Flattop of the Americas

Here at LSOZI, we take off every Wednesday for a look at the old steam/diesel navies of the 1833-1954 period and will profile a different ship each week. These ships have a life, a tale all their own, which sometimes takes them to the strangest places. – Christopher Eger

Warship Wednesday, June 2, 2021: Flattop of the Americas

Library and Archives Canada 4950939/WO-A057319

Here we see an incredible original color photo of the Colossus-class light aircraft carrier HMCS Warrior, Canada’s first flattop, at sunset circa 1946. She would fly three different flags across her short career and get close enough to an H-Bomb to almost touch the sun.

British birth

Warrior was one of 16 planned 1942 Design Light Fleet Carriers for the RN. This series, broken up into Colossus and Majestic-class sub-variants, were nifty 19,500-ton, 695-foot-long carriers that the U.S. Navy would have classified at the time as a CVL or light carrier. They were slower than the fast fleet carriers at just 25-knots with all four 3-drum Admiralty boilers were lit and glowing red, but they had long legs (over 14,000 miles at cruising speed) which allowed them to cross the Atlantic escorting convoys, travel to the Pacific to retake lost colonies or remain on station in the South Atlantic or the Indian Ocean for weeks.

The classes’ 1946 Jane’s entry under the RN’s section. Note that Warrior is missing. 

Capable of carrying up to 44 piston engine aircraft of the time, these carriers had enough punch to make it count.

The thing is, only seven of these carriers were completed before the end of World War II and even those came in during the last months and weeks. They effectively saw no service. Laid down beginning in 1942, most of the ships were launched but when the war ended, construction was canceled. Two were completed as a peculiar RN invention of a “maintenance carrier,” intended just to repair and ferry but not operate aircraft. Some were immediately transferred to expanding Commonwealth fleets. Suddenly, the Australians, Canadians, and Indians became carrier operators. The Dutch (then Argentines) and Brazilians soon followed. Class leader Colossus was sold to France as Arromanches.

HMS WARRIOR (FL 21271) At a buoy. Copyright: © IWM. Original Source: http://www.iwm.org.uk/collections/item/object/205121624

Speaking of being sold off, Warrior was ordered, originally as HMS Brave, on 7 August 1942 from Harland and Wolff (builders of the Titanic) at their yard in Belfast. Launched on 20 May 1944, just two weeks before D-Day, she was the last of the Colossus class to finish construction in WWII on 2 April 1945, just as Berlin was falling. Intended for use in the Pacific, she was made available to Ottawa on a “try it before you buy it basis” while Japan was still in the war.

Oh, Canada

The Canadians were not entirely neophytes to carrier operations, having used a couple of Ruler/Bouge-class escort or “Jeep” carriers (the RN-flagged HMS Nabob and HMS Puncher) during the war already. Outfitting four squadrons (803, 825, 826, and 883 for the RCN), she would soon be ready to fly Supermarine Seafires (later replaced by Hawker Sea Fury) fighters, and Fairey Firefly IV strike aircraft (later replaced by TBM Avengers). Commissioned as HMCS Warrior on 24 January 1946, she was the largest warship Canada operated up until that time, having previously just had cruisers and escorts.

She arrived at Halifax in March 1946 and, had Japan not surrendered six months prior, would have likely gotten in on Operation Coronet, the planned and likely very bloody Allied invasion of Honshu, where the British Pacific Fleet was scheduled to play a big part. After all, her sisters HMS Colossus, Glory, Venerable, and Vengeance had already joined the BPF in Sydney in 1945.

Instead, Warrior never went to war under a Canadian flag.

HMCS Warrior, broadside view taken from shore, 14:30 hours, 23 Aug. 1946. LAC 3198949

Warrior underway, circa 1946. Original color. LAC 4950938/WO-A057319

The batsman on HMCS Warrior, signaling aircraft to land on the flight deck, circa 1946-48. Original color. LAC 4950874/WO-A057319

R.C.N. PR434. Vickers “Seafire” Mk15. R/R Griffon 6. 803 SQD. H.M.C.S. Warrior 30 August 1946 LAC

HMCS-Uganda (C66) as seen from the Canadian aircraft carrier HMCS Warrior circa 1946, note the Fairey Firefly and Maple Leaf insignias. LAC-MIKAN-No 4821077

Fairey Firefly on the deck of HMCS Warrior, circa 1946-48. Original color. WO-A057319

Crowded hangar deck of Canadian aircraft carrier HMCS Warrior

Warrior passing under the Lions’ Gate Bridge in Vancouver 10 February 1947. Photo by Jack Lindsey/City of Vancouver Archives CVA 1184-3461

HMS Warrior (R-31) passing under the Lion’s Gate Bridge, Vancouver. Feb 9, 1947. Jack Lindsey/City of Vancouver Archives

Deck Landing Control Officer (DLCO) signaling Hawker Sea Fury to take off, on an RCN aircraft carrier, circa 1947-57. Original color. LAC 4950873/WO-A057319

RCN 881 Anti-Submarine Squadron Grumman Avenger in flight LAC 4951377

Canada’s first proper flattop was returned to the Royal Navy on 23 March 1948 at Portsmouth, replaced by the Majestic-class near-sister HMCS Magnificent.

London Calling

Upon her return to Britain, Warrior was used as a trial ship for flexible deck experiments and then was laid up. Reactivated for Korea, she was used as a transport carrier to haul troops and aircraft to the epic battle for the Peninsula, arriving there in August 1950. 



HMS Warrior off Gibraltar MOD 45139702

HMS Warrior (R31), USS Des Moines (CA-134), and HMS Gambia (48) at Malta, circa in 1951. IWM A32043

Same, IWM A32044

After a refit with new commo gear and radars, she would embark Sea Furies and Fireflies for a West Pac cruise in 1954, where she would have the White Duster in both South Africa and Hong Kong.



During this cruise, she served as a “floating nursery,” clocking in to carry refugees from newly independent North Vietnam down to the Republic of Vietnam.

THE FRENCH INDOCHINA WAR, VIETNAM 1945 – 1954 (A 33001) The aircraft carrier HMS WARRIOR evacuates 1,455 refugees from Haiphong, North Vietnam to Saigon during Operation PASSAGE TO FREEDOM, 4 September 1954. Rice and other food are issued to refugees in the forward lift well. Copyright: © IWM. Original Source: http://www.iwm.org.uk/collections/item/object/205187799

As above. Note the spare wings on her hangar deck bulkheads. IWM A 33003

HMS WARRIOR VISITS SOUTH AFRICA. ON 11 NOVEMBER 1954, ONBOARD THE LIGHT FLEET CARRIER AT PORT ELIZABETH, SOUTH AFRICA. (A 33059) A section of the large crowd of South Africans who visited HMS WARRIOR at Port Elizabeth. More than 10,000 visitors went aboard on one afternoon. Here some are looking at A Sea Fury on the WARRIOR’s deck. Copyright: © IWM. Original Source: http://www.iwm.org.uk/collections/item/object/205163735

Given another refit to add an angled deck– the Brits were the first to use such a novelty, she would embark both helicopters and fixed-wing aircraft on occasion. This included another trip to the Pacific where she would standby of the Grapple X test at Christmas Island– the first British hydrogen bomb.

Grapple test as seen from HMS Warrior via Histarmar. The carrier would be very close to three separate bombs during the tests. 

There, her Avengers, Vampires, and HAR3/4 Whirlwinds would collect fallout samples the old-fashioned way, by flying through it.

Royal Navy aircraft carrier HMS Warrior (R31). The photo was taken circa 1957, as Warrior wears the deck code “J” which had been assigned to HMS Eagle (R05) from 1951 to late 1956. Eagle then received the new deck code “E”, whereas deck code “J” was assigned to the newly refitted Warrior. NNAM No. 1996.488.037.025

Same, different view, NNAM 1996.488.037.024


HMS Warrior on speed trials in 1957, note her “J” deck designator. 

On her way back from the Grapple tests, Warrior stopped off in Argentina, then a British ally, for a very special set of tours. You see, the carrier was surplus to RN needs and was very much for sale.

Back to the Americas

Sold to Argentina, HMS/HMCS Warrior was renamed ARA Independencia (V-1) on 6 August 1958 while at Portsmouth undergoing refit. Leaving for her new homeland, she arrived in December and wasn’t officially commissioned until mid-1959 with the first Argentine carrier landing in history taking place on her deck in June.

Her initial airwing would be made up of Korean War-era F4U-5L Corsairs complete with wing-mounted radars, a few navalized SNJ-5Cs Texans, the occasional T-28A Trojan, and, after 1962, a handful of early S-2A Trackers.

Archivo Fotográfico Portaaviones “Independencia” 27 de mayo de 1960 Archivo General de la Nación Dpto. Doc. Fotográficos.

Argentina carrier ARA Independencia with Corsairs on deck, colorized by Diego Mar of Postales Navales

Aviacion Naval Argentina F4U-5 Corsair carrier

F4U-5NL Vought Corsairs of the Aviacion Naval Argentina, circa 1962, original color. The country operated 26 F4U-5/N/5NL Corsairs from 1956 to 1968, primarily flying from Independencia

Archivo Fotografico ARA INDEPENDENCIA Puerto de Buenos Aires Julio/60 Fotografia Archivo General de la Nación Dpto. Doc. Fotográficos. Buenos Aires. Argentina. Note the white-painted F4U-5 Corsairs on deck

In August 1963, an ex-U.S. Navy F9F-2B Panther flown by Capt. Justiniano Martínez Achával became the first jet to land on an Argentine carrier when it was trapped on Independencia. However, it had to be craned off as her catapults were not thought to be powerful enough to launch it safely.

At least one of the country’s two F9F-8T Cougar trainers was photographed aboard as well.

First aircraft carrier of Argentina ARA Independencia (V-1) and Vickers G-class destroyer ARA Misiones (E-11) via Histamar, circa 1965

Argentina carrier ARA Independencia y ARA Punta Médanos Foto By N del Sr Adolfo Jorge Soto‎ Buques de guerra colorised by Diego Mar Postales Navales

Argentinian light carrier ARA Independencia -ex-HMS Warrior, a Colossus class carrier) operated “navalized” T-6 Texan (SNJ), a unique force. The USN used them but in the Great Lakes in the training carriers USS Sable & USS Wolverine.

With the delivery of the more modern Colossus-class sister HNLMS Karel Doorman (ex-HMS Venerable) from Holland in 1968– which could launch Panthers and Cougars and would later carry A-4 Skyhawks– the Argentines commissioned the new flattop as ARA 25 de Mayo (V-2) on 12 March 1969 and Independencia’s days were numbered. Laid up, she was sold on 17 March 1971 and scrapped.

Today, little of Warrior remains, with her bell still washed up in Canada at the Shearwater Aviation Museum in Nova Scotia.

HMCS Warrior’s bell at Shearwater Aviation Museum via Wiki Commons

There are, also, assorted scale models of her aircraft, including those flown by the FAA, RCN, and Armada.

The last of her class in the Royal Navy, Triumph, was kept around as a repair ship until 1975 then scrapped. The final vessel of her class sent to the breakers, the third-hand ex-HMS/HMAS Vengeance/ex-NAeL Minas Gerais, was sold for scrap by the Brazilian owners in 2004, torched to man-portable pieces on the beach at Alang.

There is one, more somber legacy of Warrior as well. Members of her Grapple crew, many of which have long-term generational health issues, are often represented by the British Nuclear Test Veterans Association. 

George Baulch on the deck of HMS Warrior after the first explosion. “One of his daughters was born with severe learning disabilities, which Mr. Baulch blames on the radiation. She died in her 30s of unexplained reasons.”


Warrior’s 1946 Entry in Janes

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The Stoof delivered

People forget that the kinda dopey-looking Grumman S-2 Tracker ASW aircraft, known by the VS-squadron members that operated them as “Stoofs,” could carry a staggering amount of ordinance.

They could tote a 4,800-pound payload in the internal bomb bay and on six under-wing hardpoints and still operate from WWII-sized aircraft carriers. This included not only a wide array of torpedos, depth charges, and naval mines, but also rockets, dumb bombs, and other assorted party favors. By comparison, the Army’s North American B-25 Mitchell medium bombers that bombed Toyko with Doolittle in 1942 could only carry 3,600-pounds of bombs.

S-2 Tracker of VS-32 at Quonset Point, RI late 1960’s. Note the lineup.

Grumman S-2E Tracker Anti-Submarine Warfare aircraft (Bureau # 152339), of Anti-Submarine Squadron 37 (VS-37) from USS Ticonderoga (CVS-14) In flight over the Chocolate Mountain Weapons Testing Range, Yuma, Arizona in June 1970. This plane carries a four-rocket pod of Zuni 5-inch Folding-Fin Aircraft Rockets below its port wing. Photo USN 1148263

Argentine S-2 tracker belly showing off LAU-68 Folding Fin Aerial Rocket (FFAR) launchers designed for launching ballistic 2.75 MK-4 Mighty Mouse rockets and practice bombs

Argentine S-2 tracker belly showing off LAU-68 (FFAR) launchers designed for launching ballistic 2.75 MK-4 Mighty Mouse rockets. Practice bombs are also visible on her wings

Not bad for what is commonly just thought of as a “support aircraft” during the Cold War.