The Arado Ar 234 Blitz (English: lightning) is a jet-poweredbomber designed and produced by the German aircraft manufacturer Arado. It was the world's first operational turbojet-powered bomber, seeing service during the final years of the Second World War.
Development of the Ar 234 can be traced back to the latter half of 1940 and the request to tender from the Ministry of Aviation to produce a jet-powered high-speed reconnaissance aircraft. Arado was the only respondent with their E.370 design. While its range was beneath that of the Ministry's specification, an initial order for two prototypes was promptly issued to the company, designated Ar 234. While both of the prototypes had been mostly completed prior to the end of 1941, the Junkers Jumo 004 turbojet engines were not available prior to February 1943. Due to engine unreliability, the maiden flight of the Ar 234 V1 was delayed until 30 July 1943. In addition to the original reconnaissance-orientated Ar 234A, the fast bomber Ar 234B model was developed in response to a request by the Ministry of Aviation. Due to a lack of internal space in the relatively slender fuselage, bombloads of up to 1,500kg (3,300lb) had to be carried on external racks rather than in internal bomb bays.
The Ar 234 was produced only in small numbers, despite plans for production of 500 per month by late 1945. This was partly due to a lack of available jet engines and other critical materials, for which the aircraft had to compete with other types, such as the Messerschmitt Me 262. Several models were proposed, with alternative engines, cockpit improvements, and adaptations for other roles, including as a night fighter. In late 1944, aerial reconnaissance missions over enemy territory commenced. The Ar 234 was almost entirely used to perform such reconnaissance missions and it was in this capacity that it became the last Luftwaffe aircraft to overfly the United Kingdom during the war, in April 1945.[1] In its capacity as a bomber, the most prominent use of the Ar 234 was the repeated attempts to destroy the Ludendorff Bridge at Remagen between 7 and 17 March 1945. Many airframes were destroyed or captured on the ground due to a lack of serviceable engines or fuel.
Design and development
Background
During the closing months of 1940, the Nazi GermanMinistry of Aviation offered a tender for a jet-powered high-speed reconnaissance aircraft with a range of 2,156km (1,340mi).[2] Arado was the only company to respond, offering their E.370 project, led by Professor Walter Blume.[3][4] The design was of a high-wing mostly conventional-looking aircraft that was powered by a pair of Junkers Jumo 004turbojet engines, one being located underneath each wing.[citation needed]
Arado estimated that the E.370 would possess a maximum speed of 780km/h (480mph) at 6,000m (20,000ft), an operating altitude of 11,000m (36,000ft) and a range of 1,995km (1,240mi). While the range was short of the Ministry's specification, it decided to order a pair of prototypes, which were designated as the Ar 234. These were largely complete before the end of 1941, but the Jumo 004 engines were not ready until February 1943.[3][2] When they did arrive, Junkers considered the engines too unreliable for in-flight use and were only cleared for ground tests. Months later, flight-ready engines were finally delivered and on 30 July 1943, the Ar 234 V1 performed its first flight from Rheine airfield.[5][6]
The second prototype, V2, crashed on 2 October 1943 at Rheine near Münster after suffering a fire in its port wing, the failure of both engines, and instrumentation failures. The aircraft dived into the ground from 1,200m (3,900ft), killing the pilot.[7][8] That same year, the third prototype, V3, was displayed to Adolf Hitler at Insterberg, who was enthusiastic about the aircraft and authorised Arado to obtain factory personnel, raw materials, and the funds necessary to build two hundred by the end of 1944.[9] The eight prototype aircraft were fitted with the trolley-and-skid landing gear intended for the never produced Ar 234A version.[6]
Differences between the pair of four-engined Ar 234 prototype aircraft
The sixth and eighth in the series were powered by four BMW 003 jet engines instead of two Jumo 004s; the sixth had the four engines in individual nacelles,[10] while the eighth had the engines in "twinned" nacelles underneath each wing. A 1942 engineering drawing of the E 370 showed a 1,430L (310impgal; 380USgal) forward tank, a 830L (180impgal; 220USgal) mid-fuselage tank, and an rear tank with a 1,540L (340impgal; 410USgal) capacity.[11] These were the first four-engined jet aircraft to fly. The twin-Jumo 004 powered Ar 234 V7 prototype was the first jet aircraft used for a reconnaissance mission, on 2 August 1944.[12]
Landing gear design
The projected weight for the aircraft was approximately 8 tonnes (7.9 long tons; 8.8 short tons). To reduce weight and maximize the internal fuel, Arado did not use retractable landing gear.[2] Instead, the aircraft was to take off from a jettisonable tricycle gear-style trolley,[13][6] referred to as a nosewheel takeoff-carriage in English, as described in an Ar 234A Typenblatt factory drawing for the V8 prototype, and land on three retractable skids, one under the central section of the fuselage and one under each engine nacelle. The main skid, beneath the fuselage, was originally intended to fully retract, and was originally shown in a 1942-dated engineering drawing, under the E 370 airframe factory development designation, as intended to be made from a three-sided channel-section component, featuring a set of nine triple-beaded wooden rollers within the channel-section main skid.[14] However, this landing gear did not allow aircraft to move after the landing run, which would have left aircraft scattered over an airfield, unable to taxi off the runway. Erich Sommer said that landing the skid-equipped prototypes on a wet grass airstrip "was like greased lightning" and "like [landing on] soap", due to the complete lack of braking capability.[15][16]
At the request of the Ministry of Aviation, Arado also produced a pair of prototypes configured as fast bombers, as the Ar 234B. On 12 March 1944, the first of these, Ar 234 V9, performed its first flight. It was the first to feature a fully retractable tricycle landing gear, with the main gear retracting forward into the mid-fuselage, and the nose gear retracted rearwards.[17][18]
Restored Arado Ar 234 B-2 bomber
The Ar 234's slender fuselage was largely filled with fuel tanks, leaving no room for an internal bomb bay, which was carried on external racks. The forward-set cockpit did not provide the pilot with any visibility to the rear, thus the rear firing guns it was fitted with were aimed through a periscope, mounted on the cockpit roof. This periscope could also be flipped forwards for dive-bombing however, its usefulness was impaired by the scope's image being flipped upside down.[19] The defensive fixed rear gun system was found to be useless by the pilots, and was omitted in the Ar 234B.[20] The aircraft was widened slightly at mid-fuselage and the central fuel tank was omitted to fit in the main landing gear, while enlarged forward (1,800L (400impgal; 480USgal)) and aft (2,000L (440impgal; 530USgal)) fuel tanks compensated for its removal.[21]
During flight testing, while carrying its maximum bombload of three SC 500 bombs, the Ar 234 V9 could reach 672km/h (418mph) at 5,000m (16,000ft),[22][23] faster than any other Luftwaffe bomber at the time. The normal bomb load consisted of a pair of 500kg (1,100lb) bombs suspended from the engines or one large 1,000kg (2,200lb) bomb semi-recessed in the underside of the fuselage, while the maximum bombload was 1,500kg (3,300lb). It could also carry the heavier BT 1400 (1,510kg (3,330lb) unpowered bomb-torpedo), although the ground clearance was limited. If this munition was deployed, the aircraft's fuel capacity was noticeably reduced while rocket assistance was needed for takeoff.[citation needed] The pilot would engage the autopilot while using the bomb sight, which was interfaced with the autopilot to adjust the aircraft's flight path directly.[24]
Production lines were being set up while the 20 B-0 pre-production aircraft were being delivered, by the end of June. Production was slow, as Arado was to maintain production to compensate for other factories bombed during the USAAF's "Big Week",(20-25 February 1944),[20] in addition to an ongoing license-construction of the Heinkel He 177 heavy bomber.[25] Between mid-1944 and the end of the conflict, only 210 aircraft were built.[3] During February 1945, production switched to the C variant. German plans were for production to reach 500 per month by November 1945.[citation needed]
Ar 234B-2/N night fighter modification
In addition, some Ar 234 B-2 airframes were modified to serve as night fighters.[26] Designated Ar 234B-2/N and code named Nachtigall (Nightingale), these were fitted with FuG 218 "Neptun" VHF-band radar, with a reduced-dipole length version of the standard Hirschgeweih eight-dipole element, VHF-band transceiving AI radar antenna system, and carried a pair of forward-firing 20mm MG 151/20 autocannon within a Magirusbombe conformal gun pod on the rear fuselage hardpoint. The radar system was operated by a second crew member in a cramped compartment in the rear. Two of these served with Kommando Bonow, a Luftflotte Reich experimental test unit. Operations began in March 1945, but the aircraft was unsuitable for night fighting and no kills were made.[citation needed]
Ar 234C
Two-view silhouette of basic Ar 234C design
The Ar 234C was equipped with four lighter (625kg (1,378lb) apiece) BMW 003A engines mounted in a pair of twin-engine nacelles based on those from the eighth prototype.[27] The primary reason for this switch was to free up Junkers Jumo 004s for the Me 262, but it also improved takeoff power to nearly (31,300N (7,040lbf)). An improved cockpit, with a slightly bulged outline in the upper contour, and integrating a swept-back fairing for the periscope, and a simplified window design with 13 glazed panels reduced to 8. The BMW jet engines improved top speed by about 20% over the B series airframes.[citation needed]
The C-1 was intended for reconnaissance, the C-2 for bombing, and the C-3 for bombing, ground attack (using anti-personnel bombs) or night fighting (with two additional 20mm MG 151/20s in a forward firing ventral pack).[28]
During October 1944, the prototype Ar 234 V19 performed its first flight.[29] Although an operational test squadron was being prepared, only 14 C-series airframes were completed by the end of the war, with fewer than half having engines. Some were found at the end of the war sitting in the open, complete but for empty engine nacelles.[lower-alpha 1]. Flight testing of the new sub-type hadn't started yet when Germany surrendered. Three basic variants of the C-series were planned, with several more laid out as detailed proposals. Some of these would have had a pair of the higher thrust, but 950kg (2,090lb) heavier Heinkel HeS 011 jet engines, while others were to have swept or "crescent"-type wings.[citation needed]
Ar 234D
The D model was intended to be a two-seat aircraft based on the B-series fuselage, but with an enlarged cockpit using fewer glazing panels than the C version, powered by a pair of more powerful Heinkel HeS 011 turbojet engines. The HeS 011 powerplant never reached quantity production, but only 10[28] examples had been started
Ar 234P
The P model was intended to be a two-seat night fighter version with a variant of the D-series cockpit, differing in powerplant options and several options of radar. Several were in the planning stage, but none were produced.[citation needed]
Operational history
By 1944, the Luftwaffe's bombing capability had been severely reduced from attrition across multiple fronts,[30] and despite the advance offered by the pending arrival of production Ar 234s, there was a shortage of experienced pilots. The first unit-level type conversion orders were issued to III/KG 76 in May 1944 and personnel had to be pulled from the front lines and brought to central Germany for aircraft and engine familiarisation,[31] which was facilitated with two-seat Messerschmitt Me 262s.[32]
Challenges were encountered getting the Ar 234 operational, including poor quality of worksmanship, and severe shortages of certain resources, such as fuel.[33] The reliability of the Jumo 004 engines would worsen over time, a trend attributed to using ill-suited fuels.[34] The engines suffered from frequent flameouts and had to be overhauled or replaced after roughly ten hours of operation, although as ground crews became more skilled, the time needed to swap engines was reduced.[35] The aircraft's lengthy takeoff runs were responsible for several accidents and attempts at resolution included improvements to pilot training and the use of jettisonable liquid fuel Starthilfe rocket assisted takeoff units, mounted under each outer wing.[36] Accidents would often be fatal due to the lack of an ejection seat, the pilot instead having to exit via a highly impractical hatch in the floor.[34]
During August 1944, several of Ar 234 prototypes - including six surviving Ar 234A-series prototypes were dispatched on aerial reconnaissance missions. The seventh prototype would perform the first reconnaissance mission over the United Kingdom by a Luftwaffe jet.[37] These reconnaissance flights helped assess the potential for an Allied naval invasion of the Netherlands.[38]Allied piston-engine fighters proved unable to intercept them, being incapable of matching their speed and altitude.[39]
During the autumn of 1944, the first Ar 234Bs began entering service. Early missions included attacks in the Low Countries, at the Antwerp docks and a Brussels railway station.[40] The type was used directly against Allied units during the Battle of the Bulge, and in January 1945, Ar 234s attacked artillery positions to the north of Bastogne.[41][42] One month later, the Allies were able to capture a crashed Ar 234 after it had been forced down by a Republic P-47 Thunderbolt.[24] The type also saw action in Northern Italy.[43]
Perhaps the most notable use of the Ar 234 in the bomber role was the attempt to destroy the Ludendorff Bridge at Remagen.[44] Between 7 March, when it was captured by the Allies, and 17 March, when it finally collapsed, the bridge was continually attacked by III/KG 76 Ar 234s carrying 1,000kg (2,200lb) bombs. Most attacks missed the bridge, and heavy losses were experienced from ground-based anti-aircraft guns due to the low altitude these attacks were made from.[45][46]
By 10 April 1945, 38 operational Ar 234s were reportedly on strength, including 24 reconnaissance aircraft, 12 bombers, and two night-fighters.[45] However, most of these sat waiting for fuel and qualified personnel.
The Ar 234 continued to fly combat missions until the surrender of Germany on 8 May 1945.[45] Several were recorded as having been lost, often destroyed by anti-aircraft guns, or "bounced" by Allied fighters either during takeoff or on landing when the jets were flying slow and straight, and were most vulnerable. This technique had already been used against Messerschmitt Me 262 jet. Numerous examples would be captured by the Allies.[45][47]
Draft proposal submitted to the Reichsluftfahrtministerium (RLM) for a fast jet reconnaissance bomber.
Ar 234 V1 to V5
Initial prototypes of the Ar 234A with skid landing gear, take-off tricycle gear trolley with trio of retractable landing skids, and two Jumo 004 engines.
Ar 234 V6 & V8
Prototypes for four-engined designs for the Ar 234, meant to use the alternative choice of the lower-thrust BMW 003 turbojet engines while retaining the A model skid/trolley undercarriage. The V6 was fitted with the quartet of BMW 003s in individual nacelles, unlike the V8 prototype which had the BMW jet engines in a pair of "twinned" nacelles, and essentially "prototyped" what would become the four-engined Ar 234C's engine installation.
Ar 234 V7
Development aircraft for the Ar 234B production aircraft, retaining the A-series' intended skid undercarriage, and saw active service.
Ar 234 V9 to V11
Representative prototypes of the Ar 234B production aircraft, with the V9 being the first airframe with retractable tricycle undercarriage.
Ar 234 V13 & V20
A pair of B-series prototypes fitted with four BMW 109-003 engines intended for the C-series aircraft, using the V8 prototype's "twinned" nacelle design, but without retractable wing-skids.
Ar 234 V15
A single B-series airframe fitted with 2 x BMW 003 engines for engine development testing, and rumored to have been considered for new wing planform tests.
Ar 234 V21 to V30
C-series development aircraft. V26 and V30 had experimental thick section wooden and thin section metal laminar flow wings.
Ar 234 V16
Intended to be fitted with an experimental crescent wing with sweep back lessening towards the tips, evolved by Rüdiger Kosin and Walther Lehmann. The wing was constructed but was destroyed before it could be fitted.
Ar 234 A
The first proposed production reconnaissance bomber fitted with skid undercarriage and take-off tricycle gear trolley, built only as the series of eight trolley-and-skid undercarriage V1 through V8 prototypes.
Ar 234 B-0
20 pre-production aircraft.
Ar 234 B-1
Reconnaissance version, equipped with two Rb 50/30 or Rb 75/30 cameras. All reconnaissance variants were converted from B-2 aircraft with Rüstsatz b.
Ar 234 B-1 Berlin N
Two-engined aircraft, this was a wind tunnel test aircraft based on Ar 234 B-1 with FuG 244 Berlin N radar[disputed–discuss] installed on top. The purpose of this plane was to be an early warning jet and also a fighter control jet.[49][50]
Ar 234 B-2
Bomber version, with a maximum bombload of 1,500kg (3,307lb).
Ar 234 B-2/N
Night fighter version, two aircraft converted from B-2.
Ar 234 C-1
Four-engined aircraft – all C-series Ar 234s powered with a quartet of BMW 003 jet engines – as installed on the Ar 234 V8 prototype, otherwise similar to the Ar 234 B-1.
Ar 234 C-2
Four-engined aircraft similar to the Ar 234 B-2.
Ar 234 C-3
Multi-purpose version, armed with two 20mm MG 151/20 cannons beneath the nose.
Ar 234 C-3/N
Proposed two-seat night fighter version, armed with two forward-firing 20mm MG 151/20 and two 30mm (1.18in) MK 108 cannons, fitted with a mid-VHF band FuG 218 Neptun Vradar.
Ar 234 C-4
Armed reconnaissance version, fitted with two cameras, armed with four 20mm MG 151/20 cannon.
Ar 234 C-5
Proposed version with side-by-side seating for the crew. The 31st prototype was converted into this variant.[51][pageneeded]
Ar 234 C-5 Berlin N
Proposed C-5 with a FuG 244 Berlin-N rotating radar dish on top of the plane, for early warning and fighter control role [50][pageneeded]
Ar 234 C-6
Proposed two-seat reconnaissance aircraft. The 32nd prototype was converted into this variant.[51][pageneeded]
Ar 234 C-7
Night fighter version, with side-by-side seating for the crew, fitted with an enhanced FuG 245 Bremen O cavity magnetron-based centimetric (30GHz) radar.
Ar 234 C-8
Proposed single-seat bomber version, powered by two 1,080kg (2,380lb) Jumo 004D turbojet engines.
Ar 234 D-1
Proposed reconnaissance version. Not built.
Ar 234 D-2
Proposed bomber version. Not built.
Ar 234 P-1
Two-seater with four BMW 003A-1 engines; one 20mm MG 151/20 and one 30mm (1.18in) MK 108.
Ar 234 P-2
Also a two-seater, with redesigned cockpit protected by a 13mm (0.51in) armour plate.
Ar 234 P-3
HeS 011A powered P-2, but with two cannon.
Ar 234P-4
as P-3 but with Jumo 004D engines.
Ar 234P-5
Three-seat version with HeS 011A engines, one 20mm MG 151/20 and four 30mm (1.18in) MK 108 cannon.
Ar 234 R
Rocket-powered short range high-altitude reconnaissance version[52] It had a rocket engine in its tail, while the turbojets had been discarded. It would be towed by a He 177 to 8km altitude after which it would propel itself to 17km altitude over the target after which it would glide back unpowered. Project only.
140312 on display at the Steven F. Udvar-Hazy Center in 2007
Only one Ar 234 survives today, a B-2 bomber variant with manufacturer's serial number 140312. It was one of nine Ar 234s surrendered to British forces at Sola Airfield near Stavanger, Norway. The aircraft had been operating with 8. Staffel III./Kampfgeschwader 76 (later reorganised as Einsatzstaffel) during the final weeks of the war, having operated previously with the 8th squadron,[clarification needed] carrying the full-four-character Geschwaderkennung military code "F1+GS" on the fuselage sides, with the wing code "F1" painted in a much reduced size for sanctioned,[by whom?] late-war "low-visibility" requirements.[citation needed][further explanation needed]
The aircraft was flown from Sola to Cherbourg in France on 24 June 1945 where it joined 34 other German aircraft to be shipped to the U.S. aboard the British aircraft carrier HMSReaper. Reaper departed from Cherbourg on 20 July and arrived at Newark, New Jersey eight days later. Upon arrival two of the Ar 234s were reassembled (including 140312) and flown by USAAF pilots to Freeman Army Airfield, Indiana for testing and evaluation. 140312 was assigned the foreign equipment number FE-1010. The fate of the second Ar 234 flown to Freeman Field remains a mystery. One of the remaining two was reassembled by the United States Navy at Naval Air Station Patuxent River, Maryland, for testing, but was found to be in unflyable condition and scrapped.[55]
After receiving new engines, radio and oxygen equipment, 140312 was transferred to Wright Field near Dayton, Ohio and delivered to the Accelerated Service Test Maintenance Squadron of the Flight Test Division in July 1946. Flight testing was completed on 16 October 1946 though the aircraft remained at Wright Field until 1947. It was then transferred to Orchard Place Airport in Park Ridge, Illinois, and remained there until 1 May 1949 when it and several other aircraft stored at the airport were transferred to the Smithsonian Institution. During the early 1950s, the Ar 234 was moved to the Smithsonian's Paul Garber Restoration Facility at Suitland, Maryland for storage and eventual restoration.[55]
The Smithsonian began restoring 140312 in 1984 and finished in February 1989. All paint had been stripped from the aircraft before the Smithsonian received it, so the aircraft was painted with the markings of an aircraft of 8./KG 76,[clarification needed] the first operational unit to fly the "Blitz". The final Luftwaffe pilot who flew 140312 prior to Germany's surrender in World War II, Willi Kriessmann, was reunited with the aircraft in 1990; Kriessmann also donated his flight logs to the Smithsonian around that time.[56] The restored aircraft was first displayed at the Smithsonian's main museum building in 1993 as part of a display titled "Wonder Weapon? The Arado Ar 234".
In 2005, 140312 became one of the first aircraft moved to the new Steven F. Udvar-Hazy Center near Dulles International Airport. Today, 140312 is displayed next to the last surviving Dornier Do 335, one of the other aircraft that accompanied it on its voyage across the Atlantic Ocean aboard the Reaper.[55] 140312 is displayed with a pair of StarthilfeRATO units mounted under its wings. These may be the only surviving examples to be mounted on an aircraft design that actually used them during the conflict.[citation needed]
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References
Notes
↑ Only about 500 BMW 003 jet engines were built,[citation needed] most of which were assigned to Heinkel He 162Spatz emergency fighters
↑ Sengfelder, Günther (1993). German Aircraft Landing Gear. Atglen, PA USA: Schiffer Publishing. pp.44–45. ISBN0-88740-470-7. Skizze - Längschnitt E 370 - Fahrwerk - captioned "The preliminary design of the Ar 234 featured a very unique landing gear arrangement".
↑ Wings of the Luftwaffe – Arado Ar-234. Event occurs at 17:10.
Boyne, Walter J. (1982). The Aircraft Treasures of Silver Hill: The Behind-The-Scenes Workshop of Our Nation's Air Museums. New York, US: Rawson Associates. ISBN978-0-89256-216-9.
Boyne, Walter J. (1994). Clash of Wings. New York, US: Simon & Schuster. ISBN0-684-83915-6.
Brown, Eric (2006). Wings on My Sleeve: The World's Greatest Test Pilot Tells His Story. London, UK: Orion Books. ISBN0-297-84565-9.
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Price, Alfred (2008). "Arado Ar 234". International Air Power Review. 24. Westport, Connecticut, US: AIRTime Publishing Inc. ISSN1473-9917.
Sengfelder, Günther (1993). German Aircraft Landing Gear. Atglen, PA USA: Schiffer Publishing. ISBN0-88740-470-7.
Smith, J. Richard; Creek, Eddie J. (1984). Arado Ar 234B (Monogram Close-Up 23). Boylston, Massachusetts, US: Monogram Aviation Publications. ISBN0-914144-23-5.
Smith, J. Richard; Creek, Eddie J. (1992). Arado Ar 234 Blitz (Monogram Monarch Series No. 1). Boylston, Massachusetts, US: Monogram Aviation Publications. ISBN0-914144-51-0.
Smith, J. Richard; Creek, Eddie J. (2006). Military Aircraft in Detail: Arado Ar 234A. Hinckley, Leicestershire, UK: Midland. ISBN1-85780-225-X.
Smith, J. Richard and Creek, Eddie J. (2022) Arado Ar 234 Blitz The World's First Jet Bomber. Manchester, UK: Crecy, ISBN9781906537609.
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