Tag Archives: Avro Lancaster B Mk.I

9 January 1941

BT308, the Avro Lancaster prototype, at RAF Ringway, 9 January 1941. (Avro Heritage Museum)
Captain Harry Albert (“Sam”) Brown, O.B.E. (Photograph courtesy of Neil Corbett, Test & Research Pilots, Flight Test Engineers)

9 January 1941: Test pilot Captain Harry Albert (“Sam”) Brown, O.B.E., (1896–1953) makes the first flight of the Avro Lancaster prototype, BT308, at RAF Ringway, Cheshire, England, south of Manchester.

Throughout World War II, 7,377 of these long range heavy bombers were produced for the Royal Air Force. The majority were powered by Rolls-Royce or Packard Merlin V-12 engines—the same engines that powered the Supermarine Spitfire and North American P-51 Mustang fighters.

The bomber was designed by Roy Chadwick, F.R.S.A., F.R.Ae.S., the Chief Designer and Engineer of A. V. Roe & Company Limited, based on the earlier twin-engine Avro Manchester Mk.I. Because of this, it was originally designated as the Manchester Mk.III, before being re-named Lancaster. Chadwick was appointed Commander of the Most Excellent Order of the British Empire, 2 June 1943, for his work.

The first prototype, BT308, was unarmed and had three small vertical fins.

Avro 683 Lancaster prototype BT308, shortly after the first flight at Manchester, 9 January 1941. (A.V.Roe via R.A.Scholefield) Photograph used with permission.
Avro 683 Lancaster prototype BT308, shortly after the first flight at RAF Ringway, Manchester, England, 9 January 1941. (A.V.Roe via R.A.Scholefield) Photograph is from The R.A. Scholefield Collection and is used with permission.

With the second prototype, DG595, the small center vertical fin was deleted and two larger fins were used at the outboard ends of a longer horizontal tailplane. DG595 was also equipped with power gun turrets at the nose, dorsal and ventral positions, and at the tail.

Avro Lancaster DG595, the second protoype of the Royal Air Force four-engine heavy bomber. This armed prototype has the twin-tail arrangement of the production aircraft. (Unattributed)
Avro Lancaster DG595, the second protoype of the Royal Air Force four-engine long range heavy bomber. This armed prototype has the twin-tail arrangement of the production aircraft. (Test & Research Pilots, Flight Test Engineers)
Air Ministry clearance form for Avro 638 Lancaster BT308. Shown on page 1 are the aircraft's engine type and serial numbers.
Air Ministry clearance form for Avro 683 Lancaster BT308. Shown on page 1 are the aircraft’s engine type and serial numbers.
Air Ministry test flight clearance form, Page 2.
Air Ministry test flight clearance form, Page 2. This form is signed by the airplane’s designer, Roy Chadwick, 5 January 1941.

The first production model, Lancaster Mk.I, was operated by a crew of seven: pilot, flight engineer, navigator/bombardier, radio operator and three gunners. It was a large, all-metal, mid-wing monoplane with retractable landing gear. It was 68 feet, 11 inches (21.001 meters) long with a wingspan of 102 feet, 0 inches (31.090) meters and an overall height of 19 feet, 6 inches (5.944 meters). The Mk.I had an empty weight of 36,900 pounds (16,738 kilograms) and its maximum takeoff weight was 68,000 pounds (30,909 kilograms).

BT308 and early production Lancasters were equipped with four liquid-cooled, supercharged, 1,648.96-cubic-inch-displacement (27.01 liter), Roll-Royce Merlin XX single overhead camshaft (SOHC) 60° V-12 engines, which were rated at 1,480 horsepower at 3,000 r.p.m. to 6,000 feet (1,829 meters). The Merlins drove three-bladed de Havilland Hydromatic quick-feathering, constant-speed airscrews (propellers), which had a diameter of 13 feet, 0 inches (3.962 meters), through a 0.420:1 gear reduction.

DG595 was used for performance testing at the Aeroplane and Armament Experimental Establishment (A&AEE) at Boscombe Down. The Mark I had a maximum economic cruise speed of 267 miles per hour (430 kilometers per hour) at 20,800 feet (6,340 meters), and a maximum speed of 286 miles per hour (460 kilometers per hour) at 20,000 feet (6,096 meters) at a gross weight of 45,300 pounds (20,548 kilograms).¹ Its service ceiling was 20,000 feet (6,096 meters) at 64,500 pounds (29,257 kilograms). It had a range of  2,530 miles (4,072 kilometers) with a 7,000 pound (3,175 kilogram) bomb load.

The Lancaster was designed to carry a 14,000 pound (6,350 kilogram) bomb load, but modified bombers carried the 22,000 pound (9,979 kilogram) Grand Slam bomb. For defense, the standard Lancaster had eight Browning .303-caliber Mark II machine guns in three power-operated turrets, with a total of 14,000 rounds of ammunition.

According to the Royal Air Force, “Almost half all Lancasters delivered during the war (3,345 of 7,373) were lost on operations with the loss of over 21,000 crew members.”

Only two airworthy Avro Lancasters are in existence.

The Royal Air Force Battle of Britain Memorial Flight Avro Lancaster Mk.I, PA474. This airplane was built in 1945 by Vickers Armstongs Ltd. at Broughton, Wales, United Kingdom. (Battle of Britain Memorial Flight)
The Canadian Warplane Heritage Museum’s Avro Lancaster Mk.X FM213, flies formation with an Royal Canadian Air Force CF-188 Hornet. The bomber is marked VR A and nicknamed “Vera.” FM213 was built by Victory Aircraft Ltd., Malton, Ontario, Canada. (Canadian Warplane Heritage Museum)

¹ Speeds shown are True Air Speed (T.A.S.)

© 2019, Bryan R. Swopes

12 November 1944

Tirpitz
KMS Tirpitz anchored in Bogen Bay, Ofotfjord, near Narvik, Norway, circa 1943–1944. (U.S. Navy Historical Center)

12 November 1944: No. 9 Squadron and No. 617 Squadron (Dambusters), Royal Air Force, sent a force of 32 Avro Lancaster long range heavy bombers to attack the 49,948 metric-ton-displacement Kriegsmarine battleship KMS Tirpitz at Tromsø Fjord, Norway. The attack was filmed by a photo aircraft of No. 463 Squadron, Royal Australian Air Force.

The Lancasters were armed with 12,030 pound (5,457 kilogram) Tallboy bombs. They bombed from altitudes from 12,000 to 16,000 feet (3,658–4,877 meters). Two of the bombs hit the battleship, one was a very near miss and another three also were close enough that they probably contributed to the overall damage. Many other Tallboys landed within the torpedo nets that surrounded the ship and cratered the seabed, removing the sandy bottom which had been built up under Tirpitz‘ hull to prevent her from sinking. Tirpitz immediately began to list and was then rocked by an internal explosion. It capsized and sank to the sea bed. As many as 1,204 sailors were killed.

KMS Tirpitz under attack, 12 November 1944. The battleship is visible to the left of the bomb splashes and is firing its main guns at the bombers. (Unattributed)
KMS Tirpitz under attack, 12 November 1944. The battleship is visible to the right of the bomb splashes and is firing its main guns at the bombers. (Unattributed)

Tirpitz was a Bismarck-class battleship armed with a main battery of eight 38-centimeter (15-inch/52-caliber) guns in four turrets. These guns had a maximum range of 22.7 miles (36.5 kilometers) when firing a 1,800 pound (816 kilogram) projectile. The German Navy did not use its heavy warships to directly engage the British fleet, but instead to raid the Atlantic convoys.  The merchant ships with their destroyer escorts were defenseless against a battleship or battle cruiser. Allied forces expended tremendous effort and resources to contain or destroy Tirpitz throughout the war.

A Royal Air Force Avro Lancaster being "bombed up" with a 12,000 pound Tallboy earth-penetrating bomb.
A Royal Air Force Avro Lancaster being “bombed up” with a 12,030 pound (5,456.7 kilogram) Tallboy earth-penetrating bomb. (Royal Air Force)

The Avro Lancaster was a four-engine long range heavy bomber. It wasn’t as fast as the American B-17 Flying Fortress, but was capable of flying longer distances with a heavier bomb load. It was operated by a crew of seven: Pilot, flight engineer, navigator, radio operator, bomb aimer/nose gunner, top gunner and tail gunner. The “Lanc” was 69 feet, 4 inches (21.133 meters) long, with a wingspan of 102 feet (31.090 meters) and had an overall height of 20 feet, 6 inches (6.248 meters). It had a maximum takeoff weight (MTOW) of 72,000 pounds (32,657 kilograms) when carrying a 22,000 pound (9,979 kilogram) Grand Slam bomb.

The Lancaster was powered by four liquid-cooled, supercharged, 1,648.96-cubic-inch-displacement (27.01 liter), Rolls Royce Merlin XX or Packard V-1650 single overhead camshaft (SOHC) 60° V-12 engines, which were rated at 1,480 horsepower at 3,000 r.p.m. to 6,000 feet (1,829 meters). They turned three-bladed de Havilland Hydromatic constant-speed propellers which had a diameter of 13 feet (3.962 meters) through a 0.420:1 gear reduction.

These Merlin engines, the same as those powering Supermarine Spitfire, Hawker Hurricane and North American P-51 Mustang fighters, gave the Lancaster a maximum speed of 282 miles per hour (456 kilometers per hour) at 13,000 feet (3,962 meters) at a weight of 63,000 pounds (28,576 kilometers per hour). The service ceiling was 21,400 feet (6,523 meters) and maximum range was 2,530 miles (4,073 kilometers).

Defensive armament for a standard Lancaster consisted of eight Browning Mark II .303-caliber machine guns in three power turrets, nose, dorsal and tail. Modified bombers deleted various combinations of guns to reduce weight.

The Tallboy (Bomb, Medium Capacity, 12,000 lb) was a special demolition bomb designed to be dropped from high altitude, reach supersonic speeds, then penetrate as far as 90 feet (27 meters) into the ground before detonating. It was built of a specially hardened steel casing filled with 5,200 pounds (2,358 kilograms) of Torpex explosive. The bomb was designed by Barnes Wallis, who had also designed the special bomb used by the Dambusters in their famous 1943 attack on the Ruhr Valley hydroelectric dams, as well as the Grand Slam, a 22,000-pound (10,000 kilogram) scaled-up version of the Tallboy. The Tallboy and Grand Slam bombs were very successfully used against U-boat pens and heavily fortified underground rocket facilities.

A flight of three Avro Lancaster bombers of No. 617 Squadron, Royal Air Force, photographed 8 May 1945. The airplane closest to the camera, marked KC-B, is a Lancaster B Mk.I. The other two are Lancaster B Mk.I Specials modified to carry the 22,000 pound Grand Slam bomb. They are identified by the "YZ" fuselage codes. Photograph from the collection of Mrs. Cresswell, © IWM MH-30796.
A flight of three Avro Lancaster bombers of No. 617 Squadron, Royal Air Force, photographed 8 May 1945. The airplane closest to the camera, marked KC-B, is a Lancaster B Mk.I. The other two are Lancaster B Mk.I Specials modified to carry the 22,000 pound Grand Slam bomb. They are identified by the “YZ” fuselage codes. Photograph from the collection of Mrs. Cresswell, © IWM MH-30796.

© 2016, Bryan R. Swopes

Victoria Cross, Acting Squadron Leader John Dering Nettleton, Royal Air Force

Squadron Leader John Dering Nettleton, V.C., Royal Air Force. Imperial War Museum CH 5669)

Operation Margin: Just over a month after the first combat missions flown by the new Avro Lancaster B Mk.I very long range heavy bomber, Acting Squadron Squadron Leader John Dering Nettleton, RAF, commanding No. 44 (Rhodesia) Squadron, lead one of two formations of six Lancasters from RAF Waddington and RAF Woohall Spa, in Lincolnshire, England, on a very low altitude daylight penetration of enemy territory to attack the Maschinenfabrik Augsburg-Nürnberg AG (MAN) diesel engine factory at Augsburg, Bavaria, in the south of Germany. The factory was a source of diesel engines for Nazi Germany’s U-boat fleet. It was a target of high military importance, and the daylight attack was very dangerous.

Each Lancaster carried four 1,000 pound (454 kilogram) bombs. The two formations (the other was from No. 97 Squadron) crossed the English Channel at an altitude of just 50 feet (15 meters) in an effort to evade detection by enemy radar.

During the flight across France and into Germany, Nettleton’s flight was under almost constant attack by enemy fighters. Only two 44 Squadron Lancasters made it to the target and dropped their bombs, but one of those was almost immediately shot own. Only Nettleton’s bomber, Lancaster B. Mk.I R5508, KM B, survived to return to England.

The other flight, led by Squadron Leader John Sherwood, flew a different route and all six arrived at Augsburg. After bombing the factory, Sherwood’s Lancaster was hit by antiaircraft fire, caught fire, crashed and exploded. Only Sherwood survived. Another was hit but was able to drop its bombs on the target before crashing. Another Lanc was badly damaged, but dropped its bombs and made it away.

Of the twelve Lancasters that had set out, just five returned. All were damaged, one of them beyond repair.

Of the 85 airmen on the mission, 49 were listed as missing in action.

Seventeen 1,000 pound bombs had made direct hits on the factory, but only twelve detonated. Though the target suffered significant damage, production of U-boat engines continued.

Post-strike photograph of the MAN factory at Augsburg, Germany, 18 April 1942. (Royal Air Force)

Squadron Leader Nettleton was awarded the Victoria Cross. Flight Lieutenant David Jackson Penman, DFC, of No. 97 Squadron was awarded the Distinguished Service Order. Flt Lt Brian R. W. Hallows, Acting Flt Lt Charles S. C. McClure, Acting Flying Officer Ernest W. Rodley, Pilot Officer Patrick A. Deverill DFM, Plt Off Patrick A Dorehill, Plt Off Gilbert C. Hooey, Plt Off Edward L. Ifould, and Plt Off Desmond O. Sands were awarded the Distinguished Flying Cross. Flight Sergeant Frank H. Harrison, Flt Sgt Brian G. Lough, Flt Sgt Leonard H. Mutter, Sergeant Charles F. Churchill, Sgt Thomas H. Goacher, Sgt Donald N. Huntley, Sgt Ronald P. Irons, Sgt Kenneth O. Mackay, Sgt Douglas L. Overton, and Sgt John T. Radcliffe were awarded the Distinguished Flying Medal.

“Lancaster B Mark I, L7578 ‘KM-B’, of No.97 Squadron RAF, piloted by Squadron Leader J D Nettleton of No. 44 Squadron RAF, flying at low-level over the Lincolnshire countryside during a Squadron practice for the low-level attack on the M.A.N. diesel engineering works at Augsburg, which took place on 17 April 1942. 97 Squadron lent L7578 temporarily to 44 Squadron, who repainted the aircraft with Nettleton’s unit code-letters. Nettleton actually flew R5508 on the operation, for the leadership of which he was awarded the Victoria Cross. L7578 did not participate in the raid and was returned to 97 Squadron at Woodhall Spa.” (Imperial War Museum HU 91969)
“The Acting Commanding Officer of No. 44 Squadron RAF, Squadron Leader J D Nettleton (sitting, second from left) and his crew, photographed on their return to Waddington, Lincolnshire, after leading the low-level daylight attack on the M.A.N. diesel engineering works at Augsburg on 17 April 1942. For his courage and leadership during the raid Nettleton was gazetted for the award of the Victoria Cross on 28 April. He later commanded No. 44 Squadron, but was killed on 13 July 1943 while returning from a raid on Turin.” Imperial War Museum HU 92988)

John Dering Nettleton was born 28 June 1917 at Nongoma, Zululand, Union of South Africa. He was the son of John Hennah Nettleton and Ethel Maud Barker Nettleton, and the grandson of Admiral Alfred Thomas Dering Nettleton, Royal Navy. Nettleton was educated at the Western Province Preparatory School, an Anglican Church school in Claremont, a suburb of Cape Town.

S.A.T.S General Botha at Simon’s Town Harbor, Western Cape, South Africa. (Leaves From My Logbook)

In 1930, at the age of 13, Nettleton went aboard the South African training ship, S.A.T.S. General Botha (formerly, H.M.S. Thames) as a cadet. After graduating three years later, he served as third officer of the 6,919 ton merchant ship, S.S. Mattawin.

Elder Dempster Lines’ S.S. Mattawin at Cape Town. (Andrey Nelogov)

He was appointed a midshipman, Royal Naval Volunteer Reserve (South African Division), 3 September 1935. He rose to the rank of lieutenant, RNVR.

Following his time at sea, Nettleton returned to Cape Town where he became an apprentice civil engineer.

Nettleton sailed with his mother, Mrs. Nettleton, from Durban, South Africa, aboard the Union-Castle Mail Steamship Company liner, S.S. Winchester Castle, arriving at Southampton, England, 11 April 1938.

The S.S. Winchester Castle at Cape Town, South Africa, circa 1938.

While in England, Nettleton joined the Royal Air Force, and began flight training at the No. 8 Elementary and Reserve Flying Training Squadron at Reading. He was given a Short Service Commission as a Pilot Officer in the Royal Air Force, 14 December 1938 ¹ and reported to No. 12 FTS at RAF Grantham in Lincolnshire, but within two weeks was reassigned to No. 11 FTS at RAF Shawbury, in Shropshire. He graduated 22 July 1939.

Nettleton was appointed an Acting Pilot Officer (41452) on probation, with effect 3 September 1939—the same day that the United Kingdom and France declared war on Germany, following that country’s invasion of Poland.² He was assigned to No. 207 Squadron, an operational training unit for the Fairey Battle, a single-engine light bomber powered by a Rolls-Royce Merlin engine, based at RAF Cottesmore in the East Midlands of England.

Fairey Battle (Aircraft of the Fighting Powers Vol.I)

Pilot Officer Nettleton was soon reassigned to No. 98 Squadron at RAF Hucknall, Nottinghamshire, which was also equipped with the Battle. In November 1939, he returned to Cottesmore for transition training to the Handley Page HP.52 Hamden twin-engine medium bomber, with No. 185 Squadron.

Handley Page HP.52 Hamden (Tangmere Military Aviation Museum)

Pilot Officer Nettleton was promoted to the rank of Flying Officer, 3 September 1940.³

This Day in Aviation was unable to confirm the date of Nettleton’s promotion to Flight Lieutenant, but Wikipedia states that it occurred in February 1941.

On 26 June 1941, Flight Lieutenant Nettleton joined No. 44 (Rhodesia) Squadron at RAF Waddington in Lincolnshire. This squadron was the first to completely convert to the Avro Lancaster, with the first “Lanc” arriving on Christmas Eve, 24 December 1941.

Flight Lieutenant Nettleton was promoted to Acting Squadron Leader, 17 July 1941.

Flight Officer Nettleton was promoted to Flight Lieutenant (War Substantive), 3 September 1941.⁴

Squadron Leader Nettleton, Royal Air Force Volunteer Reserve, was Mentioned in Despatches, 24 September 1941.⁵

On 11 June 1942, Squadron Leader (acting) J.D. Nettleton, VC, was Mentioned in Despatches.⁶

Squadron Leader John Dering Nettleton married Section Officer Betty Isobel Havelock, Women’s Auxiliary Air Force, of Paignton, Devon, at Lincoln, Lincolnshire, England, 1 July 1942. They would have one son, John Dering Nettleton, born 19 February 1944.

Squadron Leader Nettleton was next posted to No. 44 Conversion Flight. In November 1942, he was assigned to No. 1661 Heavy Conversion Unit, also at RAF Waddington.

Squadron Leader Nettleton was promoted to Wing Commander (acting), 4 January 1943, and returned to combat operations with No. 44 Squadron.

Squadron Leader Nettleton was promoted to the rank of Wing Commander (War Substantive), Reserve of Air Force Officers, 2 June 1943.⁷

At 10:23 p.m., 12 July 1943, Wing Commander Nettleton took off from RAF Dunholm Lodge, Lincolnshire, in Lancaster KM Z (ED331), as on 295 Lancasters sent to attack Turin, Italy. ED331 never returned. The bodies of Nettleton and his crew, Flt Lt Dennis Cramp, Flt Lt Ian Milne Wood, Fg Off Fred irving Calcutt, Fg Off Kenneth Stanly Juniper, Fg Off Arthur Ronald Ludlow, Plt Off John Edward Money, and Flt Sgt Dennis Ernest Arthur Seager, were never recovered.

Wing Commander Nettleton was just 26 years old. His name is listed on Panel 118 of the Runnymede Memorial at Englefield Green, Surrey.

Avro Lancaster B Mk.I R5727 over Montreal, Canada, 1942. (Royal Air Force)

The Avro Lancaster made its first flight 9 January 1941, and flew its first combat mission (with No. 44 Squadron) on 3 March 1942. The Lancaster B Mk.I was operated by a crew of seven: pilot, flight engineer, navigator/bombardier, radio operator and three gunners.  It was a large, all-metal, mid-wing monoplane with retractable landing gear. It was 68 feet, 11 inches (21.001 meters) long with a wingspan of 102 feet, 0 inches (31.090) meters and an overall height of 19 feet, 6 inches (5.944 meters). The Mk.I had an empty weight of 36,900 pounds (16,738 kilograms) and its maximum takeoff weight was 68,000 pounds (30,909 kilograms)

Early production Lancasters were equipped with four liquid-cooled, supercharged, 1,648.96-cubic-inch-displacement (27.01 liter), Roll-Royce Merlin XX single overhead camshaft (SOHC) 60° V-12 engines, which were rated at 1,480 horsepower at 3,000 r.p.m. to 6,000 feet (1,829 meters). The Merlins drove three-bladed, 13 feet, 0 inch (3.962 meters), de Havilland Hydromatic quick-feathering, constant-speed airscrews (propellers), through a 0.420:1 gear reduction.

The Mark I had a maximum economic cruise speed of 267 miles per hour (430 kilometers per hour) at 20,800 feet (6,340 meters), and a maximum speed of 286 miles per hour (460 kilometers per hour) at 20,000 feet (6,096 meters) at a gross weight of 45,300 pounds (20,548 kilograms). Its service ceiling was 20,000 feet (6,096 meters) at 64,500 pounds (29,257 kilograms). It had a range of  2,530 miles (4,072 kilometers) with a 7,000 pound (3,175 kilogram) bomb load.

The Lancaster was designed to carry a 14,000 pound (6,350 kilogram) bomb load, but modified bombers carried the 22,000 pound (9,979 kilogram) Grand Slam bomb.

For defense, the standard Lancaster had eight Browning .303-caliber Mark II machine guns in three power-operated turrets, with a total of 14,000 rounds of ammunition.

According to the Royal Air Force, “Almost half all Lancasters delivered during the war (3,345 of 7,373) were lost on operations with the loss of over 21,000 crew members.”

Only two airworthy Avro Lancasters are in existence.

Canadian Warplane Heritage Museum’s Victory Aircraft-built Lancaster B Mk.X, FM213, civil registration C-GVRA, shown with markings KB726, VR A. (Canadian Warplane Heritage Museum)

 

 

 

 

 

 

 

 

 

¹ National Library of Scotland, UK, British Air Force Lists 1919–1945

² The London Gazette, Issue 34705,10 October 1939, Page 6796

³ The London Gazette, Supplement 34989, 12 November 1940, Page 6494

⁴ The London Gazette, Number 35309, 14 October 1941, Page 5968

The London Gazette, Number 35284, 24 September 1941, Page 5572

The London Gazette, Number 35586, 11 June 1942, Page 2519

⁷ The London Gazette, Supplement 36113, 30 July 1943, Page 3443

© 2023, Bryan R. Swopes