{"id":28621109,"date":"2026-10-18T21:40:00","date_gmt":"2026-10-18T19:40:00","guid":{"rendered":"https:\/\/migflug.com\/afterburner\/airspeed-as39-fleet-shadower-royal-navy-night-shadowing-aircraft\/"},"modified":"2026-10-18T21:40:20","modified_gmt":"2026-10-18T19:40:20","slug":"airspeed-as39-fleet-shadower-royal-navy-night-shadowing-aircraft","status":"publish","type":"post","link":"https:\/\/migflug.com\/afterburner\/airspeed-as39-fleet-shadower-royal-navy-night-shadowing-aircraft\/","title":{"rendered":"Airspeed AS.39 Fleet Shadower: Britain&#8217;s Four-Engined Night Stalker"},"content":{"rendered":"<style>.et_pb_title_container h1.entry-title { padding-top: 40px !important; }<\/style>\r\n<!-- mfsh:top -->\r\n\r\n<style>\r\n.mfsh-trigger{display:inline-flex;align-items:center;gap:10px;height:44px;padding:0 18px;margin:0 0 26px;border:2px solid 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Somewhere below, an enemy battle squadron is steaming hard, blacked out. Above it, at little more than 40 knots, a strange four-engined monoplane drifts along at 1,500 feet, its crew peering into the dark and quietly radioing the fleet's position back to the Admiralty.<\/p>\r\n<p>That was the plan behind the Airspeed AS.39 Fleet Shadower, which made its first flight on 17 October 1940, 86 years ago this week. It was built to be slow, quiet and patient, and to operate from an aircraft carrier. It was also obsolete almost before its wheels left the ground.<\/p>\r\n<p>Only one was ever completed. Four months after it first flew, the Royal Navy cancelled the whole programme and ordered the aircraft scrapped. The reason was not a design flaw but a new invention: radar.<\/p>\r\n\r\n<div style=\"background:#f4f6f9;border-left:4px solid #5C91FF;padding:18px 22px;margin:22px 0 26px\"><p style=\"margin:0 0 8px;font-weight:700;color:#0d1117\">Quick Facts<\/p><ul style=\"margin:0;padding-left:18px\"><li style=\"margin:4px 0\"><strong>Type:<\/strong> Carrier-capable night fleet-shadowing aircraft<\/li><li style=\"margin:4px 0\"><strong>Requirement:<\/strong> Operational Requirement OR.52, Specification S.23\/37<\/li><li style=\"margin:4px 0\"><strong>Engines:<\/strong> Four Pobjoy Niagara V seven-cylinder radials<\/li><li style=\"margin:4px 0\"><strong>Crew:<\/strong> Three: pilot, observer, radio operator<\/li><li style=\"margin:4px 0\"><strong>First flight:<\/strong> 17 October 1940<\/li><li style=\"margin:4px 0\"><strong>Maximum speed:<\/strong> 126 mph at 5,000 ft<\/li><li style=\"margin:4px 0\"><strong>Stall speed:<\/strong> 33 mph<\/li><li style=\"margin:4px 0\"><strong>Built:<\/strong> One completed, second unfinished<\/li><li style=\"margin:4px 0\"><strong>Cancelled:<\/strong> 17 February 1941; both airframes scrapped<\/li><\/ul><\/div>\r\n\r\n<h2 style=\"padding-top:22px\">A Requirement to Fly Slowly<\/h2>\r\n<p>In the late 1930s the Royal Navy worried about losing contact with enemy capital ships after dark. Its answer was Operational Requirement OR.52, written up as Specification S.23\/37: an aircraft that could find a hostile fleet and then simply stay with it through the night.<\/p>\r\n<p>The numbers were unusual. The specification asked for a speed of just 38 knots at 1,500 feet, held for not less than six hours. The aircraft had to be quiet at cruising speed, give the observer a good view, and operate from a carrier, which meant folding wings for the hangar deck.<\/p>\r\n<p>Five companies showed interest: Percival, Short Brothers, Fairey Aviation, General Aircraft and Airspeed. General Aircraft and Airspeed were each contracted to build two prototypes. Airspeed's contract was dated 10 August 1938.<\/p>\r\n\r\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" src=\"https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/10\/general-aircraft-gal38-fleet-shadower-prototype.jpg\" alt=\"General Aircraft GAL.38 Fleet Shadower prototype on the ground with four Pobjoy engines and RAF roundels\" style=\"width:100%;height:auto;max-width:100%;display:block\"><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">The rival General Aircraft GAL.38, built to the same S.23\/37 specification. It shared the AS.39's high wing, fixed undercarriage and four small Pobjoy engines. Photo: UK Government, via Wikimedia Commons \/ Public domain<\/figcaption><\/figure>\r\n\r\n<h2 style=\"padding-top:22px\">Four Tiny Engines and a Glass Nose<\/h2>\r\n<p>Airspeed's answer was a high-wing, strut-braced monoplane with wooden wings and tail and an all-metal monocoque fuselage. It sat on fixed, divided main landing gear with a tailwheel. The wingspan was 55 ft 4 in.<\/p>\r\n<p>The crew of three was stacked inside the fuselage. The observer sat in the nose behind windows on three sides. The pilot's compartment was raised so that there was a passage back to the radio operator's station.<\/p>\r\n<p>Power came from four Pobjoy Niagara V seven-cylinder radials, small engines more at home on light aircraft. Spreading them across the wing was deliberate: their propwash blew over the wing and generated extra lift at low speed. The listed stall speed was just 33 mph.<\/p>\r\n\r\n<div style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;margin:24px 0\"><iframe class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" src=\"https:\/\/www.youtube.com\/embed\/S67Yybt-lTo\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\" allowfullscreen><\/iframe><\/div>\r\n\r\n<p style=\"font-size:13px;color:#777;text-align:center;font-style:italic\">Rex's Hangar walks through both Fleet Shadower designs, the Airspeed AS.39 and the General Aircraft GAL.38, and why neither entered service.<\/p>\r\n<h2 style=\"padding-top:22px\">17 October 1940: A Troubled First Flight<\/h2>\r\n<p>The first flight slipped because the Niagara V engines suffered from vibration problems. When the single completed AS.39 finally took to the air on 17 October 1940, Britain was already a year into the war.<\/p>\r\n<p>The prototype was not a happy aircraft. It showed stability problems and poor stall handling, and the low power of its four engines made both worse. With all four running it could reach 126 mph at 5,000 feet, cruise at 113 mph and stay up for six hours.<\/p>\r\n<p>Airspeed was asked to look at re-engining the design with two Armstrong Whitworth Cheetah XI radials and adding rear-facing machine guns. The second prototype was still unfinished when, on 17 February 1941, the Navy cancelled the Fleet Shadower programme. Airspeed was told to scrap both airframes.<\/p>\r\n\r\n<div style=\"background:#f8f9fa;border-left:4px solid #5C91FF;padding:20px 22px;margin:18px 0 24px;font-size:16px;line-height:1.7\"><div><em>&ldquo;among the most bizarre carrier aircraft ever attempted&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>Norman Polmar<\/strong> &mdash; naval historian, on the two Fleet Shadowers, as quoted by Robert Beckhusen in Trench Art (2025)<\/div><\/div><\/div>\r\n\r\n<h2 style=\"padding-top:22px\">The Rival From General Aircraft<\/h2>\r\n<p>General Aircraft built its GAL.38 to the same requirement, and the two designs looked like cousins. Because of development problems with the Niagara V, the GAL.38 first flew on 13 May 1940 with lower-powered Niagara III engines, five months before the Airspeed machine.<\/p>\r\n<p>Its propwash over full-span flaps gave a minimum speed of 39 mph. It too had stability problems, though not as bad as the AS.39's. Rebuilt with Niagara V engines and a single large fin in place of its original three, it flew again in June 1941.<\/p>\r\n<p>Test flying continued until September 1941, with the incomplete second airframe used for spares. In March 1942 General Aircraft was instructed to scrap the prototype as well. Neither Fleet Shadower ever reached a squadron of the <a href=\"https:\/\/migflug.com\/air-forces\/fleet-air-arm\/\">Fleet Air Arm<\/a>.<\/p>\r\n\r\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" src=\"https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/10\/gal38-fleet-shadower-three-view-drawing.png\" alt=\"Three-view line drawing of the General Aircraft GAL.38 Fleet Shadower showing four wing-mounted engines and a single tail fin\" style=\"width:100%;height:auto;max-width:100%;display:block\"><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">A 1947 three-view drawing of the GAL.38 in its later single-fin form. No comparable public-domain drawing of the Airspeed AS.39 could be found. Drawing: Les Ailes, 25 January 1947, via Wikimedia Commons \/ Public domain<\/figcaption><\/figure>\r\n\r\n<h2 style=\"padding-top:22px\">Killed by Radar<\/h2>\r\n<p>Why did the Navy give up on the idea so quickly? Wikipedia and the British Aviation Resource Center give the same answer: the requirement had been made obsolete by the introduction of radar on long-range patrol aircraft such as the <a href=\"https:\/\/migflug.com\/aircraft\/b-24-liberator\/\">Liberator<\/a> I.<\/p>\r\n<p>Air-to-Surface Vessel radar, ASV for short, grew out of an accident. In 1937 a team testing an experimental air-to-air set noticed returns from the docks and cranes at Harwich. Follow-up trials in <a href=\"https:\/\/migflug.com\/aircraft\/avro-anson\/\">Avro Anson<\/a> aircraft found shipping, and on 4 September 1937 the system picked up Royal Navy ships on manoeuvres in almost complete overcast.<\/p>\r\n\r\n<div style=\"background:#f8f9fa;border-left:4px solid #5C91FF;padding:20px 22px;margin:18px 0 24px;font-size:16px;line-height:1.7\"><div><em>&ldquo;This, had they known, was the writing on the wall for the German Submarine Service.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>Albert Percival Rowe<\/strong> &mdash; Tizard Committee, on the 1937 ASV trials, as quoted in Wikipedia's history of ASV radar<\/div><\/div><\/div>\r\n\r\n<p>Production ASV sets entered operational service in early 1940, the first radar to be fitted to an aircraft in a combat setting. An improved Mark II followed from late 1940. A radar-equipped patrol aircraft did not need to fly slowly or quietly over a fleet. It could find ships at night and through cloud, from a distance, and stay out of gun range while doing it.<\/p>\r\n<p>Robert Beckhusen, writing in Trench Art, adds a second reason. By 1940 the main threat at sea was the U-boat rather than the surface battle fleet, and land-based maritime patrol bombers fitted with radar far exceeded the Fleet Shadowers' range and spotting ability.<\/p>\r\n\r\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" src=\"https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/10\/raf-liberator-i-am910-asv-radar-1941.jpg\" alt=\"RAF Liberator Mark I AM910 converted for anti-submarine work with ASV radar aerials on top of the rear fuselage\" style=\"width:100%;height:auto;max-width:100%;display:block\"><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">Liberator Mark I AM910 after conversion for anti-submarine patrol at Prestwick in 1941. The row of masts along the rear fuselage are ASV radar aerials, the technology that made the Fleet Shadower redundant. Photo: Royal Air Force official photographer, IWM ATP 9767C, via Wikimedia Commons \/ Public domain<\/figcaption><\/figure>\r\n\r\n<h2 style=\"padding-top:22px\">What the Fleet Shadower Tells Us<\/h2>\r\n<p>The Fleet Shadower was not a foolish idea. Carrier aircraft of the period, such as the <a href=\"https:\/\/migflug.com\/aircraft\/fairey-swordfish\/\">Fairey Swordfish<\/a>, were expected to find and track ships by eye, and keeping contact through a night was a real problem. The specification solved it in the only way 1937 technology allowed: put trained eyes over the target and keep them there.<\/p>\r\n<p>What changed was the sensor. Once a radar set could see through darkness and cloud, the airframe no longer had to be built around the observer's eyeballs. That shift from airframe to sensor has shaped maritime patrol aircraft ever since.<\/p>\r\n\r\n<div style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;margin:24px 0\"><iframe class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" src=\"https:\/\/www.youtube.com\/embed\/kf8o5pfXEEo\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\" allowfullscreen><\/iframe><\/div>\r\n\r\n<p style=\"font-size:13px;color:#777;text-align:center;font-style:italic\">A wartime training film explaining ASV radar to technical personnel, largely through animated diagrams. Footage: Huntley Film Archives.<\/p>\r\n<p>The AS.39 left no survivors and few photographs. Its legacy is a lesson in timing: a carefully engineered answer to the 1937 problem that arrived in the air in late 1940, just as a box of electronics made the question irrelevant.<\/p>\r\n<p><em>Sources: Wikipedia (Airspeed Fleet Shadower; General Aircraft Fleet Shadower; Air-to-surface-vessel radar), British Aviation Resource Center (Warbirds Resource Group), Trench Art (Robert Beckhusen), Aeroplane Monthly via Aviadejavu<\/em><\/p>\r\n<!-- mfsh:bottom -->\r\n\r\n<button type=\"button\" class=\"mfsh-trigger mfsh-bottom\" data-mfsh-placement=\"bottom\" aria-haspopup=\"dialog\"><svg><use href=\"#mfsh-i-share\"\/><\/svg>Share this story<\/button>\r\n\r\n<!-- \/mfsh:bottom -->\r\n\r\n<style>.mfq{margin:34px 0 8px}.mfq h2{font:26px\/1.3 \"Gilroy semiBold\",Helvetica,Arial,sans-serif;color:#0d1117;padding-top:22px;margin:0 0 6px}.mfq .qa details{border-top:1px solid #5C91FF;margin:0;padding:0}.mfq .qa details:last-of-type{border-bottom:1px solid #e2e7ee}.mfq .qa summary{cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:16px;padding:22px 26px;font:18px\/1.7 \"Gilroy semiBold\",Helvetica,Arial,sans-serif;color:#0d1117}.mfq .qa summary::-webkit-details-marker{display:none}.mfq .qa summary::after{content:\"+\";font:24px Helvetica,sans-serif;color:#3568e0;flex:0 0 auto}.mfq .qa details[open] summary::after{content:\"\\2013\"}.mfq .qa details:hover summary{color:#3568e0}.mfq .qa .a{font:16px\/1.7 \"Gilroy regular\",Helvetica,Arial,sans-serif;color:#454e5e;padding:0 26px 24px}.mfq .qa .a a{color:#3568e0}@media(max-width:680px){.mfq .qa summary{padding:18px 14px;font-size:17px}.mfq .qa .a{padding:0 14px 20px}}<\/style>\r\n\r\n\r\n<section class=\"mfq\"><h2>Frequently Asked Questions<\/h2><div class=\"qa\"><details open><summary>What was the Airspeed AS.39 Fleet Shadower?<\/summary><div class=\"a\">The Airspeed AS.39 Fleet Shadower was a British prototype built to Royal Navy Specification S.23\/37 for an aircraft that could shadow enemy fleets at night. It was a slow, carrier-capable high-wing monoplane with folding wings, a crew of three and four small Pobjoy Niagara V engines. Only one was completed.<\/div><\/details><details><summary>When did the Airspeed AS.39 Fleet Shadower first fly?<\/summary><div class=\"a\">The Airspeed AS.39 Fleet Shadower made its first flight on 17 October 1940. The flight had been delayed by vibration problems with its Pobjoy Niagara V engines. Testing revealed stability problems and poor stall handling, made worse by the low power of its four engines.<\/div><\/details><details><summary>Why was the Airspeed Fleet Shadower cancelled?<\/summary><div class=\"a\">The Royal Navy cancelled the Fleet Shadower programme on 17 February 1941. The requirement had been made obsolete by radar fitted to long-range patrol aircraft such as the Liberator I, which could find ships at night and through cloud. Airspeed was told to scrap both AS.39 airframes.<\/div><\/details><details><summary>How fast was the Airspeed AS.39 Fleet Shadower?<\/summary><div class=\"a\">The Airspeed AS.39 Fleet Shadower had a maximum speed of 126 mph at 5,000 feet and cruised at 113 mph. More important for its mission was low-speed flight: its stall speed was just 33 mph, and the specification called for 38 knots at 1,500 feet for at least six hours.<\/div><\/details><details><summary>How many Airspeed AS.39 Fleet Shadowers were built?<\/summary><div class=\"a\">Airspeed was contracted for two AS.39 prototypes, but only one was completed and flown. The second was still unfinished when the Royal Navy cancelled the programme on 17 February 1941, and the company was asked to scrap both aircraft. No example survives today.<\/div><\/details><details><summary>What was the General Aircraft GAL.38 Fleet Shadower?<\/summary><div class=\"a\">The General Aircraft GAL.38 was the rival to the Airspeed AS.39, built to the same Specification S.23\/37 with four Pobjoy engines and a high wing. It first flew on 13 May 1940, flew again in June 1941 with a single fin, tested until September 1941 and was ordered scrapped in March 1942.<\/div><\/details><\/div><\/section>\r\n\r\n\r\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What was the Airspeed AS.39 Fleet Shadower?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The Airspeed AS.39 Fleet Shadower was a British prototype built to Royal Navy Specification S.23\/37 for an aircraft that could shadow enemy fleets at night. 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Airspeed was told to scrap both AS.39 airframes.\"}},{\"@type\":\"Question\",\"name\":\"How fast was the Airspeed AS.39 Fleet Shadower?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The Airspeed AS.39 Fleet Shadower had a maximum speed of 126 mph at 5,000 feet and cruised at 113 mph. More important for its mission was low-speed flight: its stall speed was just 33 mph, and the specification called for 38 knots at 1,500 feet for at least six hours.\"}},{\"@type\":\"Question\",\"name\":\"How many Airspeed AS.39 Fleet Shadowers were built?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Airspeed was contracted for two AS.39 prototypes, but only one was completed and flown. The second was still unfinished when the Royal Navy cancelled the programme on 17 February 1941, and the company was asked to scrap both aircraft. 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It first flew on 13 May 1940, flew again in June 1941 with a single fin, tested until September 1941 and was ordered scrapped in March 1942.\"}}]}<\/script><div style=\"background:#f0f4ff;border-left:4px solid #5C91FF;padding:16px 20px;margin:32px 0 8px\"><p style=\"margin:0 0 8px;font-weight:600;color:#333\">Related Posts<\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/channel-dash-esmonde-swordfish-operation-cerberus-1942\/\">The Channel Dash: Six Swordfish Against a Battle Fleet<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/why-carrier-aircraft-fold-their-wings-sto-wing\/\">Why Carrier Jets Fold Their Wings, and What It Costs Them<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/fairey-firefly-fleet-air-arm-two-seat-carrier-fighter\/\">Fairey Firefly: Two Seats, a Griffon and a Very Long War<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/f6d-missileer-fleet-defense-cancelled\/\">The Fighter Built Never to Dogfight<\/a><\/p><\/div>\r\n","protected":false},"excerpt":{"rendered":"<p>Share this story Picture a moonless night in the North Sea. Somewhere below, an enemy battle squadron is steaming hard, blacked out. Above it, at little more than 40 knots, a strange four-engined monoplane drifts along at 1,500 feet, its crew peering into the dark and quietly radioing the fleet&#8217;s position back to the Admiralty. [&hellip;]<\/p>\n","protected":false},"author":27,"featured_media":28614431,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"editor_notices":[],"footnotes":""},"categories":[666,664],"tags":[],"class_list":["post-28621109","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-history-and-legends","category-military-aviation"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Airspeed AS.39 Fleet Shadower: Night Stalker | MiGFlug<\/title>\n<meta name=\"description\" content=\"The Airspeed AS.39 Fleet Shadower flew on 17 October 1940 to stalk enemy fleets at night. 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