page_title: CAM ship
section_title: Origin
hierarchical_section_title: CAM ship / Origin
caption_attribution_description: A Royal Air Force Hawker Hurricane Mk IA on the catapult of a CAM (Catapult Armed Merchant) Ship at Greenock, Syotland (UK). The first RAF trial CAM launch was from SS Empire Rainbow at Greenock on the River Clyde on 31 May 1941, the Hurricane landed at Abbotsinch.
context_page_description: CAM ships were World War II-era British merchant ships used in convoys as an emergency stop-gap until sufficient escort carriers became available. CAM ship is an acronym for catapult aircraft merchant ship.
  They were equipped with a rocket-propelled catapult launching a single Hawker Hurricane, dubbed a "Hurricat" or "Catafighter" to destroy or drive away an attacking bomber. Normally the Hurricane fighter would be lost when the pilot then bailed out or ditched in the ocean near the convoy. CAM ships continued to carry their normal cargoes after conversion.
  The concept was developed and tested by the five fighter catapult ships, commissioned as warships and commanded and crewed by the Royal Navy – but the CAM ships were merchant vessels, commanded and crewed by the Merchant Navy.
context_section_description: The German Luftwaffe had Focke-Wulf Fw 200 Condor aircraft with a range of nearly 2,000 nautical miles (3,700 km – 2,300 miles). After the Fall of France, these aircraft could operate from western France against British merchant ships in the Atlantic. Flying from Bordeaux–Mérignac Airport, Fw 200s of I/KG40 could reach the convoy lanes west of Britain while staying outside the range of British land-based fighters. The Royal Navy had no aircraft carriers available to provide close air cover for the convoys. The Fw 200s could shadow convoys, directing U-boat attacks on them, or drop bombs on convoy ships, without opposition and to deadly effect.
  To counter this threat, the Admiralty developed the fighter catapult ship –  a converted freighter, manned by a naval crew, carrying a single Hawker Hurricane fighter. When an enemy bomber was sighted, the fighter would be launched into the air with rockets, and fly up to destroy or drive away the bomber. Being large and slow, the Fw 200 became a rather vulnerable target. After the combat, the fighter pilot would bail out or ditch in the ocean near the convoy, and be picked up if all went well.
  The Admiralty had already experimented with this system. They ordered 50 rocket-propelled aircraft catapults to be fitted to merchant ships. The planes were Hurricane Mark Is, converted to Sea Hurricane IAs.
  The pilots for these aircraft were drawn from the Royal Air Force (RAF). The RAF formed the Merchant Ship Fighter Unit (MSFU) on 5 May 1941 in RAF Speke by the River Mersey in Liverpool.  Wing Commander E.S. Moulton-Barrett commanded the unit providing training for volunteer pilots, fighter direction officers (FDOs), and airmen. After training, MSFU crews were posted to Liverpool, Glasgow, or Avonmouth where they assisted in loading their Hurricanes onto the catapults. Each team consisted of one pilot for Atlantic runs (or two pilots for voyages to Russia, Gibraltar, or the Mediterranean Sea), with one fitter, one rigger, one radio-telephone operator, one FDO, and a seaman torpedoman who worked on the catapult as an electrician.
  MSFU crews signed ship's articles as civilian crew members under the authority of the civilian ship's master. The ship's chief engineer became responsible for the catapult, and the first mate acted as catapult duty officer (CDO), responsible for firing the catapult when directed. The single Hurricane fighter was launched only when enemy aircraft were sighted and agreement was reached using hand and flag signals between the pilot, CDO, and ship's master.
  The first four or five ships were taken into Royal Navy service as "auxiliary fighter catapult ships", and later conversions were officially named CAMs manned by merchant crews. The first CAM ship, Michael E, was sponsored by the Royal Navy while the RAF MSFUs were working up. After a trial launch off Belfast, Michael E sailed with convoy OB 327 on 28 May 1941. She was sunk by U-108 on 2 June.
  The first RAF trial CAM launch was from Empire Rainbow, at Greenock on the River Clyde on 31 May 1941; the Hurricane landed at Abbotsinch. Six CAM ships joined convoys in June 1941. When a CAM ship arrived at its destination, the pilot usually launched and landed at a nearby airfield to get in as much flight time as possible before his return trip. Pilots were rotated out of CAM assignments after two round-trip voyages to avoid the deterioration of flying skills from the lack of flying time during the assignment.
  CAM sailings were initially limited to North American convoys with aircraft maintenance performed by the Royal Canadian Air Force at Dartmouth, Nova Scotia. CAM ships sailed on Gibraltar and Freetown convoys beginning in September 1941, after an aircraft maintenance unit was established at the RAF base at North Front, Gibraltar. No CAM aircraft were provided during January and February 1942 after it proved impossible to maintain the catapult-mounted aircraft in flying order during the North Atlantic winter. CAM sailings resumed on 6 March 1942 on North Atlantic convoys and in April on the Arctic Russian convoys with
caption: A Hurricane IA before launch during trials at Greenock, in 1941
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