V-2 rocket

In the late 1920s, a young Wernher von Braun bought a copy of Hermann Oberth's book, Die Rakete zu den Planetenräumen (The Rocket into Interplanetary Spaces). Starting in 1930, he attended the Technical University of Berlin, where he assisted Oberth in liquid-fueled rocket motor tests. Von Braun was working on his doctorate when the Nazi Party gained power in Germany. An artillery captain, Walter Dornberger, arranged an Ordnance Department research grant for von Braun, who from then on worked next to Dornberger's existing solid-fuel rocket test site at Kummersdorf. Von Braun's thesis, Construction, Theoretical, and Experimental Solution to the Problem of the Liquid Propellant Rocket (dated 16 April 1934), was kept classified by the German Army and was not published until 1960.[8] By the end of 1934, his group had successfully launched two rockets that reached heights of 2.2 and 3.5 km (1.4 and 2.2 mi).

At the time, Germany was highly interested in American physicist Robert H. Goddard's research. Before 1939, German engineers and scientists occasionally contacted Goddard directly with technical questions. Von Braun used Goddard's plans from various journals and incorporated them into the building of the Aggregat (A) series of rockets, named for the German word for mechanism or mechanical system.[9]

Following successes at Kummersdorf with the first two Aggregate series rockets, Wernher von Braun and Walter Riedel began thinking of a much larger rocket in the summer of 1936,[10] based on a projected 25,000 kg (55,000 lb) thrust engine. In addition, Dornberger specified the military requirements needed to include a 1 ton payload, a range of 172 miles with a dispersion of 2 or 3 miles, and transportable using road vehicles.[11]^:50–51

Wernher von Braun at Peenemünde Army Research Center

Wind tunnel model of an A4 in the German Museum of Technology in Berlin

After the A-4 project was postponed due to unfavourable aerodynamic stability testing of the A-3 in July 1936,[12][13] von Braun specified the A-4 performance in 1937,[14] and, after an "extensive" series of test firings of the A-5 scale test model,[15] using a motor redesigned from the troublesome A-3 by Walter Thiel,[15] A-4 design and construction was ordered c. 1938/39.[16] During 28–30 September 1939, Der Tag der Weisheit (English: The Day of Wisdom) conference met at Peenemünde to initiate the funding of university research to solve rocket problems.[10]^:40

By late 1941, the Army Research Center at Peenemünde possessed the technologies essential to the success of the A-4. The four key technologies for the A-4 were large liquid-fuel rocket engines, supersonic aerodynamics, gyroscopic guidance and rudders in jet control.[3] At the time, Adolf Hitler was not particularly impressed by the V-2; he pointed out that it was merely an artillery shell with a longer range and much higher cost.[17]

In early September 1943, von Braun promised, the Long-Range Bombardment Commission[3]^:224 that the A-4 development was "practically complete/concluded",[13]^:135 but even by the middle of 1944, a complete A-4 parts list was still unavailable.[3]^:224 Hitler was sufficiently impressed by the enthusiasm of its developers, and needed a "wonder weapon" to maintain German morale,[17] so he authorized its deployment in large numbers.[18]

The V-2s were constructed at the Mittelwerk site by prisoners from Mittelbau-Dora, a concentration camp where 12,000–20,000 prisoners died during the war.[19][20][21]

In 1943 the Austrian resistance group around Heinrich Maier managed to send exact drawings of the V-2 rocket to the American Office of Strategic Services. Location sketches of V-rocket manufacturing facilities, such as those in Peenemünde, were also sent to Allied general staffs in order to enable Allied bombers to carry out air strikes. This information was particularly important for Operation Hydra. The group was gradually captured by the Gestapo and most of the members were executed.[22][23][24][25]

Layout of a V-2 rocket

The A-4 used a 75% ethanol/25% water mixture (B-Stoff) for fuel and liquid oxygen (LOX) (A-Stoff) for oxidizer.[26] The water reduced the flame temperature, acted as a coolant by turning to steam and augmented the thrust, tended to produce a smoother burn, and reduced thermal stress.[27]

Rudolf Hermann's supersonic wind tunnel was used to measure the A-4's aerodynamic characteristics and center of pressure, using a model of the A-4 within a 40 square centimeter chamber. Measurements were made using a Mach number 1.86 blowdown nozzle on 8 August 1940. Tests at Mach numbers 1.56 and 2.5 were made after 24 September 1940.[28]^:76–78

At launch the A-4 propelled itself for up to 65 seconds on its own power, and a program motor held the inclination at the specified angle until engine shutdown, after which the rocket continued on a ballistic free-fall trajectory. The rocket reached a height of 80 km (50 mi) after shutting off the engine.[29]

The fuel and oxidizer pumps were driven by a steam turbine, and the steam was produced by concentrated hydrogen peroxide (T-Stoff) with sodium permanganate (Z-Stoff) catalyst. Both the alcohol and oxygen tanks were an aluminium-magnesium alloy.[1]

The turbopump, rotating at 4000 rpm, forced the alcohol and oxygen into the combustion chamber at 33 gallons per second, where they were ignited by a spinning electrical igniter. Thrust increased to 8 tons during this preliminary stage, before increasing to 25 tons, lifting the 13.5 ton rocket. Combustion gases exited the chamber at 5,100 °F (2,820 °C), and a speed of 6500 feet per second. The oxygen to fuel mixture was 1.0:0.85 at 25 tons of thrust, but as ambient pressure decreased with flight altitude, thrust increased until it reached 29 tons.[11][30][31] The turbopump assembly contained two centrifugal pumps, one for the alcohol, and one for the oxygen, both connected to a common shaft. Hydrogen peroxide converted to steam, using a sodium permanganate catalyst powered the pump, which delivered 120 pounds of alcohol and 150 pounds of liquid oxygen per second to a combustion chamber at 210 psi.[28]

Dr. Thiel's development of the 25 ton rocket motor relied on pump feeding, rather than on the earlier pressure feeding. The motor used centrifugal injection, while using both regenerative cooling and film cooling. Film cooling admitted alcohol into the combustion chamber and exhaust nozzle under slight pressure through four rings of small perforations. The mushroom-shaped injection head was removed from the combustion chamber to a mixing chamber, the combustion chamber was made more spherical while being shortened from 6 to 1 foot in length, and the connection to the nozzle was made cone shaped. The resultant 1.5 ton chamber operated at a combustion pressure of 220 pounds per square inch. Thiel's 1.5 ton chamber was then scaled up to a 4.5 ton motor by arranging three injection heads above the combustion chamber. By 1939, eighteen injection heads in two concentric circles at the head of the 0.12-inch thick sheet-steel chamber, were used to make the 25 ton motor.[11]^:52–55[28]

The warhead was another source of troubles. The explosive employed was amatol 60/40 detonated by an electric contact fuze. Amatol had the advantage of stability, and the warhead was protected by a thick layer of glass wool, but even so it could still explode in the re-entry phase. The warhead weighed 975 kilograms (2,150 lb) and contained 910 kilograms (2,010 lb) of explosive. The warhead's percentage by weight that was explosive was 93%, a very high percentage when compared with other types of munition.

The protective layer was used for the fuel tanks as well and the A-4 did not have the tendency to form ice, which had plagued other early missiles (like the balloon tank-design SM-65 Atlas). The tanks held 4,173 kilograms (9,200 lb) of ethyl alcohol and 5,553 kilograms (12,242 lb) of oxygen.[32]

Captured V-2 on public display in Antwerp, 1945. Exhaust vanes and external rudders in tail section shown.

The V-2 was guided by four external rudders on the tail fins, and four internal graphite vanes in the jet stream at the exit of the motor. These 8 control surfaces were controlled by Helmut Hölzer's analog computer, the Mischgerät, via electrical-hydraulic servomotors, based on electrical signals from the gyros. The Siemens Vertikant LEV-3 guidance system consisted of two free gyroscopes (a horizontal for pitch and a vertical with two degrees of freedom for yaw and roll) for lateral stabilization, coupled with a PIGA accelerometer, or the Walter Wolman radio control system, to control engine cutoff at a specified velocity. Other gyroscopic systems used in the A-4 included Kreiselgeräte's SG-66 and SG-70. The V-2 was launched from a pre-surveyed location, so the distance and azimuth to the target were known. Fin 1 of the missile was aligned to the target azimuth.[33][28]^:rp

Some later V-2s used "guide beams", radio signals transmitted from the ground, to keep the missile on course, but the first models used a simple analog computer[34] that adjusted the azimuth for the rocket, and the flying distance was controlled by the timing of the engine cut-off, "Brennschluss", ground controlled by a Doppler system or by different types of on-board integrating accelerometers. Thus, range was a function of engine burn time, which ended when a specific velocity was achieved.[30][11]^:203–204[31] Just before engine cutoff, thrust was reduced to 8 tons, in an effort to avoid any water hammer problems a rapid cutoff could cause.[27]

Dr. Friedrich Kirchstein of Siemens of Berlin developed the V-2 radio control for motor-cut-off (German: Brennschluss).[13]^:28,124 For velocity measurement, Professor Wolman of Dresden created an alternative of his Doppler[35]^:18 tracking system in 1940–41, which used a ground signal transponded by the A-4 to measure the velocity of the missile.[3]^:103 By 9 February 1942, Peenemünde engineer Gerd deBeek had documented the radio interference area of a V-2 as 10,000 metres (33,000 feet) around the "Firing Point",[36] and the first successful A-4 flight on 3 October 1942, used radio control for Brennschluss.[12]^:12 Although Hitler commented on 22 September 1943 that "It is a great load off our minds that we have dispensed with the radio guiding-beam; now no opening remains for the British to interfere technically with the missile in flight",[13]^:138 about 20% of the operational V-2 launches were beam-guided.[12]^:12[11]^:232 The Operation Pinguin V-2 offensive began on 8 September 1944, when Lehr- und Versuchsbatterie No. 444[35]^:51–2 (English: Training and Testing Battery 444) launched a single rocket guided by a radio beam directed at Paris.[36]^:47 Wreckage of combat V-2s occasionally contained the transponder for velocity and fuel cutoff.[10]^:259–60

The painting of the operational V-2s was mostly a ragged-edged pattern with several variations, but at the end of the war a plain olive green rocket also appeared. During tests the rocket was painted in a characteristic black-and-white chessboard pattern, which aided in determining if the rocket was spinning around its longitudinal axis.

A U.S. Army cut-away of the V-2

The original German designation of the rocket was "V2",[7][37] unhyphenated – exactly as used for any Third Reich-era "second prototype" example of an RLM-registered German aircraft design – but U.S. publications such as Life magazine were using the hyphenated form "V-2" as early as December 1944.[38]

Testing

See also: List of V-2 test launches

For a description of a test explosion, see Test Stand VII.

The first successful test flight was on 3 October 1942, reaching an altitude of 84.5 kilometres (52.5 miles).[3] On that day Walter Dornberger declared in a speech at Peenemünde:

This third day of October, 1942, is the first of a new era in transportation, that of space travel...[12]¹⁷

A sectioned V-2 engine on display at the Deutsches Museum, Munich (2006).

Two test launches were recovered by the Allies: the Bäckebo rocket, the remnants of which landed in Sweden on 13 June 1944, and one recovered by the Polish resistance on 30 May 1944[39] from Blizna and transported to the UK during Operation Most III. The highest altitude reached during the war was 174.6 kilometres (108.5 miles) (20 June 1944).[3] Test launches of V-2 rockets were made at Peenemünde, Blizna and Tuchola Forest,[11]^:211 and after the war, at Cuxhaven by the British, White Sands Proving Grounds and Cape Canaveral by the U.S., and Kapustin Yar by the USSR.

Various design issues were identified and solved during V-2 development and testing:

• To reduce tank pressure and weight, high flow turbopumps were used to boost pressure.[3]^:35
• A short and lighter combustion chamber without burn-through was developed by using centrifugal injection nozzles, a mixing compartment, and a converging nozzle to the throat for homogeneous combustion.[12]^:51
• Film cooling was used to prevent burn-through at the nozzle throat.[12]^:52
• Relay contacts were made more durable to withstand vibration and prevent thrust cut-off just after lift-off.[12]^:52
• Ensuring that the fuel pipes had tension-free curves reduced the likelihood of explosions at 1,200–1,800 m (4,000–6,000 ft).[12]^:215,217
• Fins were shaped with clearance to prevent damage as the exhaust jet expanded with altitude.[12]^:56,118
• To control trajectory at liftoff and supersonic speeds, heat-resistant graphite vanes were used as rudders in the exhaust jet.[12]^:35,58

23 June 1943 RAF reconnaissance photo of V-2s at Test Stand VII

On 27 March 1942, Dornberger proposed production plans and the building of a launching site on the Channel coast. In December, Speer ordered Major Thom and Dr. Steinhoff to reconnoiter the site near Watten. Assembly rooms were established at Pennemünde and in the Friedrichshafen facilities of Zeppelin Works. In 1943, a third factory, Raxwerke, was added.[11]^:71–72,84

On 22 December 1942, Hitler signed the order for mass production, when Albert Speer assumed final technical data would be ready by July 1943. However, many issues still remained to be solved even by the autumn of 1943.[41]

On 8 January 1943, Dornberger and von Braun met with Speer. Speer stated, "As head of the Todt organisation I will take it on myself to start at once with the building of the launching site on the Channel coast," and established an A-4 production committee under Degenkolb.[11]^:72–77

On 26 May 1943, the Long-Range Bombardment Commission, chaired by AEG director Petersen, met at Peenemünde to review the V-1 and V-2 automatic long-range weapons. In attendance were Speer, Air Marshal Erhard Milch, Admiral Karl Dönitz, Col. General Friedrich Fromm, and Karl Saur. Both weapons had reached the stage of development, and the commission decided to recommend to Hitler that both weapons be put into mass production. As Dornberger observed, "The disadvantages of the one would be compensated by the other's advantages."[11]^{:83–84,87–92}

On 7 July 1943, Major General Dornberger, von Braun, and Dr. Steinhof briefed Hitler in his Wolf's Lair. Also in attendance were Speer, Wilhelm Keitel, and Alfred Jodl. The briefing included von Braun narrating a film showing the successful launch on 3 October 1942, with scale models of the Channel coast firing bunker, and supporting vehicles, including the Meillerwagen. Hitler then gave Pennemünde top priority in the German armaments program stating, "Why was it I could not believe in the success of your work? if we had had these rockets in 1939 we should never have had this war..." Hitler also wanted a second launch bunker built.[11]^:93–105

Saur planned to build 2000 rockets per month, between the existing three factories and the Nordhausen Mittelwerk factory being built. However, alcohol production was dependent upon the potato harvest.[11]^{:97,102–105}

A production line was nearly ready at Peenemünde when the Operation Hydra attack occurred. The main targets of the attack included the test stands, the development works, the Pre-Production Works, the settlement where the scientists and technicians lived, the Trassenheide camp, and the harbor sector. According to Dornberger, "Serious damage to the works, contrary to first impressions, was surprisingly small." Work resumed after a delay of four to six weeks, and because of camouflage to mimic complete destruction, there were no more raids over the next nine months. The raid resulted in 735 lives lost, with heavy losses at Trassenheide, while 178 were killed in the settlement, including Dr. Thiel, his family, and Chief Engineer Walther.[11]^:139–152 The Germans eventually moved production to the underground Mittelwerk in the Kohnstein where 5,200 V-2 rockets were built with the use of forced labour.[42]

A V-2 launched from Test Stand VII in summer 1943

Following Operation Crossbow bombing, initial plans for launching from the massive underground Watten, Wizernes and Sottevast bunkers or from fixed pads such as near the Château du Molay[43] were dropped in favour of mobile launching. Eight main storage dumps were planned and four had been completed by July 1944 (the one at Mery-sur-Oise was begun in August 1943 and completed by February 1944).[44] The missile could be launched practically anywhere, roads running through forests being a particular favourite. The system was so mobile and small that only one Meillerwagen was ever caught in action by Allied aircraft, during the Operation Bodenplatte attack on 1 January 1945[45] near Lochem by a USAAF 4th Fighter Group aircraft, although Raymond Baxter described flying over a site during a launch and his wingman firing at the missile without hitting it.

It was estimated that a sustained rate of 350 V-2s could be launched per week, with 100 per day at maximum effort, given sufficient supply of the rockets.[46]

One of the victims of a V-2 that struck Teniers Square, Antwerp, Belgium on 27 November 1944. A British military convoy was passing through the square at the time; 126 (including 26 Allied soldiers) were killed.[47]

The LXV Armeekorps z.b.V. formed during the last days of November 1943 in France commanded by General der Artillerie z.V. Erich Heinemann was responsible for the operational use of V-2.[48] Three launch battalions were formed in late 1943, Artillerie Abteilung 836 (Mot.), Grossborn, Artillerie Abteilung 485 (Mot.), Naugard, and Artillerie Abteilung 962 (Mot.). Combat operations commenced in Sept. 1944, when training Batterie 444 deployed. On 2 September 1944, the SS Werfer-Abteilung 500 was formed, and by October, the SS under the command of SS Lt. Gen Hans Kammler, took operational control of all units. He formed Gruppe Sud with Art. Abt. 836, Merzig, and Gruppe Nord with Art. Abt. 485 and Batterie 444, Burgsteinfurt and The Hague.[30]^:14–16[49]

After Hitler's 29 August 1944 declaration to begin V-2 attacks as soon as possible, the offensive began on 7 September 1944 when two were launched at Paris, but both crashed soon after launch. On 8 September a single rocket was launched at Paris, which caused modest damage near Porte d'Italie.[10]^:218,220,467 Two more launches by the 485th followed, including one from The Hague against London on the same day at 6:43 pm.[13]^:285 – the first landed at Staveley Road, Chiswick, killing 63-year-old Mrs. Ada Harrison, 3-year-old Rosemary Clarke, and Sapper Bernard Browning on leave from the Royal Engineers,[14]^:11 and one that hit Epping with no casualties. Upon hearing the double-crack of the supersonic rocket (London's first ever), Duncan Sandys and Reginald Victor Jones looked up from different parts of the city and exclaimed "That was a rocket!", and a short while after the double-crack, the sky was filled with the sound of a heavy body rushing through the air.[13]^:286

The British government initially attempted to conceal the cause of the explosions by blaming them on defective gas mains.[50] The public therefore began referring to the V-2s as "flying gas pipes".[51] The Germans themselves finally announced the V-2 on 8 November 1944 and only then, on 10 November 1944, did Winston Churchill inform Parliament, and the world, that England had been under rocket attack "for the last few weeks".[52]

In September 1944, control of the V-2 mission was taken over by the Waffen-SS and Division z.V.[53][54]

Positions of the German launch units changed a number of times. For example, Artillerie Init 444 arrived in the southwest Netherlands (in Zeeland) in September 1944. From a field near the village of Serooskerke, five V-2s were launched on 15 and 16 September, with one more successful and one failed launch on the 18th. That same date, a transport carrying a missile took a wrong turn and ended up in Serooskerke itself, giving a villager the opportunity to surreptitiously take some photographs of the weapon; these were smuggled to London by the Dutch Resistance.[55] After that the unit moved to the woods near Rijs, Gaasterland in the northwest Netherlands, to ensure that the technology did not fall into Allied hands. From Gaasterland V-2s were launched against Ipswich and Norwich from 25 September (London being out of range). Because of their inaccuracy, these V-2s did not hit their target cities. Shortly after that only London and Antwerp remained as designated targets as ordered by Adolf Hitler himself, Antwerp being targeted in the period of 12 to 20 October, after which time the unit moved to The Hague.

Ruined buildings at Whitechapel, London, left by the penultimate V-2 to strike the city on 27 March 1945; the rocket killed 134 people. The final V-2 to fall on London killed one person at Orpington later the same day.[56]

Over the following months about 3,172 V-2 rockets were fired at the following targets:[57]

Belgium, 1664: Antwerp (1610), Liège (27), Hasselt (13), Tournai (9), Mons (3), Diest (2)

United Kingdom, 1,402: London (1,358), Norwich (43),[13]^:289 Ipswich (1)

France, 76: Lille (25), Paris (22), Tourcoing (19), Arras (6), Cambrai (4)

Netherlands, 19: Maastricht (19)

Germany, 11: Remagen (11)

Antwerp, Belgium was a target for a large number of V-weapon attacks from October 1944 through to the virtual end of the war in March 1945, leaving 1,736 dead and 4,500 injured in greater Antwerp. Thousands of buildings were damaged or destroyed as the city was struck by 590 direct hits. The largest loss of life by a single rocket attack during the war came on 16 December 1944, when the roof of the crowded cinema Rex was struck, leaving 567 dead and 291 injured.[58]

An estimated 2,754 civilians were killed in London by V-2 attacks with another 6,523 injured,[59] which is two people killed per V-2 rocket. However, this understates the potential of the V-2, since many rockets were misdirected and exploded harmlessly. Accuracy increased over the course of the war, particularly for batteries where the Leitstrahl (radio guide beam) system was used.[60] Missile strikes that found targets could cause large numbers of deaths – 160 were killed and 108 seriously injured in one explosion at 12:26 pm on 25 November 1944, at a Woolworth's department store in New Cross, south-east London.[61] British intelligence sent false reports via their Double-Cross System implying that the rockets were over-shooting their London target by 10 to 20 miles (16 to 32 km). This tactic worked; more than half of the V-2s aimed at London landed outside the London Civil Defence Region.[62]^{:p. 459} Most landed on less-heavily populated areas in Kent due to erroneous recalibration. For the remainder of the war, British intelligence kept up the ruse by repeatedly sending bogus reports implying that the rockets were now striking the British capital with heavy loss of life.[63]

Final use

The extent of damage caused to a London residential area due to a single V-2 strike in January 1945

The final two rockets exploded on 27 March 1945. One of these was the last V-2 to kill a British civilian and the final civilian casualty of the war on British soil: Ivy Millichamp, aged 34, killed in her home in Kynaston Road, Orpington in Kent.[67][68] A scientific reconstruction carried out in 2010 demonstrated that the V-2 creates a crater 20 metres (66 feet) wide and 8 metres (26 feet) deep, ejecting approximately 3,000 tons of material into the air.[63]

The German V-weapons (V-1 and V-2) cost the equivalent of around US$40 billion (2015 dollars), which was 50 percent more than the Manhattan Project that produced the atomic bomb.[10]^:178 6,048 V-2s were built, at a cost of approximately 100,000 Reichsmark (GB£2,370,000 (2011)) each; 3,225 were launched. SS General Hans Kammler, who as an engineer had constructed several concentration camps including Auschwitz, had a reputation for brutality and had originated the idea of using concentration camp prisoners as slave laborers in the rocket program. More people died manufacturing the V-2 than were killed by its deployment.[73]

The V-2 consumed a third of Germany's fuel alcohol production and major portions of other critical technologies:[75] to distil the fuel alcohol for one V-2 launch required 30 tonnes of potatoes at a time when food was becoming scarce.[76] Due to a lack of explosives, some warheads were simply filled in with concrete, using the kinetic energy alone for destruction, and sometimes the warhead contained photographic propaganda of German citizens who had died in Allied bombings.[77]

The psychological effect of the V-2 was considerable, as the V-2, travelling faster than the speed of sound, gave no warning before impact (unlike bombing planes or the V-1 Flying Bomb, which made a characteristic buzzing sound). There was no effective defence and no risk of pilot and crew casualties. An example of the impression it made is in the reaction of American pilot and future nuclear strategist and Congressional aide William Liscum Borden, who in November 1944 while returning from a nighttime mission over Holland saw a V-2 in flight on its way to strike London:[78][79] "It resembled a meteor, streaming red sparks and whizzing past us as though the aircraft were motionless. I became convinced that it was only a matter of time until rockets would expose the United States to direct, transoceanic attack."[80]

With the war all but lost, regardless of the factory output of conventional weapons, the Nazis resorted to V-weapons as a tenuous last hope to influence the war militarily (hence Antwerp as V-2 target), as an extension of their desire to "punish" their foes and most importantly to give hope to their supporters with their miracle weapon.[17] The V-2 had no effect on the outcome of the war, but it led to the ICBMs of the Cold War, which in turn were used for space exploration.[81]

A submarine-towed launch platform was tested successfully, making it the prototype for submarine-launched ballistic missiles. The project codename was Prüfstand XII ("Test stand XII"), sometimes called the rocket U-boat. If deployed, it would have allowed a U-boat to launch V-2 missiles against United States cities, though only with considerable effort (and limited effect).[82] Hitler, in July 1944 and Speer, in January 1945, made speeches alluding to the scheme,[83] though Germany did not possess the capability to fulfill these threats. These schemes were met by the Americans with Operation Teardrop.

While interned after the war by the British at CSDIC camp 11, Dornberger was recorded saying that he had begged the Führer to stop the V-weapon propaganda, because nothing more could be expected from one ton of explosive. To this Hitler had replied that Dornberger might not expect more, but he (Hitler) certainly did.

According to decrypted messages from the Japanese embassy in Germany, twelve dismantled V-2 rockets were shipped to Japan.[84] These left Bordeaux in August 1944 on the transport U-boats U-219 and U-195, which reached Djakarta in December 1944. A civilian V-2 expert was a passenger on U-234, bound for Japan in May 1945 when the war ended in Europe. The fate of these V-2 rockets is unknown.

At the end of the war, a race began between the United States and the USSR to retrieve as many V-2 rockets and staff as possible.[85] Three hundred rail-car loads of V-2s and parts were captured and shipped to the United States and 126 of the principal designers, including Wernher von Braun and Walter Dornberger, were in American hands. Von Braun, his brother Magnus von Braun, and seven others decided to surrender to the United States military (Operation Paperclip) to ensure they were not captured by the advancing Soviets or shot dead by the Nazis to prevent their capture.[86]

After the Nazi defeat, German engineers were moved to the United States, the United Kingdom and the USSR, where they further developed the V-2 rocket for military and civilian purposes.[87] The V-2 rocket also laid the foundation for the liquid fuel missiles and space launchers used later.[88]

Britain

Operation Backfire V-2 rocket on Meillerwagen (SI Negative #76-2755).

In October 1945, Operation Backfire assembled a small number of V-2 missiles and launched three of them from a site in northern Germany. The engineers involved had already agreed to move to the US when the test firings were complete. The Backfire report remains the most extensive technical documentation of the rocket, including all support procedures, tailored vehicles and fuel composition.

In 1946, the British Interplanetary Society proposed an enlarged man-carrying version of the V-2, called Megaroc. It could have enabled sub-orbital spaceflight similar to, but at least a decade earlier than, the Mercury-Redstone flights of 1961.[89][90]

United States

Main article: V-2 sounding rocket

US test launch of a Bumper V-2.

Operation Paperclip recruited German engineers and Special Mission V-2 transported the captured V-2 parts to the United States. At the close of the Second World War, over 300 rail cars filled with V-2 engines, fuselages, propellant tanks, gyroscopes, and associated equipment were brought to the railyards in Las Cruces, New Mexico, so they could be placed on trucks and driven to the White Sands Proving Grounds, also in New Mexico.

In addition to V-2 hardware, the U.S. Government delivered German mechanization equations for the V-2 guidance, navigation, and control systems, as well as for advanced development concept vehicles, to U.S. defence contractors for analysis. In the 1950s some of these documents were useful to U.S. contractors in developing direction cosine matrix transformations and other inertial navigation architecture concepts that were applied to early U.S. programs such as the Atlas and Minuteman guidance systems as well as the Navy's Subs Inertial Navigation System.[91]

A committee was formed with military and civilian scientists to review payload proposals for the reassembled V-2 rockets.[92] This led to an eclectic array of experiments that flew on V-2s and paved the way for American manned space exploration. Devices were sent aloft to sample the air at all levels to determine atmospheric pressures and to see what gases were present. Other instruments measured the level of cosmic radiation.

The first photo of Earth from space was taken from a V-2 launched by US scientists on 24 October 1946.

Only 68 percent of the V-2 trials were considered successful.[93] A supposed V-2 launched on 29 May 1947 landed near Juarez, Mexico and was actually a Hermes B-1 vehicle.[94]

The U.S. Navy attempted to launch a German V-2 rocket at sea—one test launch from the aircraft carrier USS Midway was performed on 6 September 1947 as part of the Navy's Operation Sandy. The test launch was a partial success; the V-2 went off the pad but splashed down in the ocean only some 10 km (6 mi) from the carrier. The launch setup on the Midway's deck is notable in that it used foldaway arms to prevent the missile from falling over. The arms pulled away just after the engine ignited, releasing the missile. The setup may look similar to the R-7 launch procedure but in the case of the R-7 the trusses hold the full weight of the rocket, rather than just reacting to side forces.

The PGM-11 Redstone rocket is a direct descendant of the V-2.[95]

USSR

Main article: Soviet space program

R-1 rocket (V-2 rebuilt by Russia) on a Vidalwagen at Kapustin Yar

The USSR also captured a number of V-2s and staff, letting them stay in Germany for a time.[96] The first work contracts were signed in the middle of 1945. In October 1946 (as part of Operation Osoaviakhim) they were obliged to move to Branch 1 of NII-88 on Gorodomlya Island in Lake Seliger where Helmut Gröttrup headed up a group of 150 engineers.[97] In October 1947, a group of German scientists supported the USSR in launching rebuilt V-2s in Kapustin Yar. The German team was indirectly overseen by Sergei Korolev, the "chief designer" of the Soviet rocketry program.

The first Soviet missile was the R-1, a duplicate of the V-2 completely manufactured in Russia, which was first launched in October 1948. From 1947 until the end of 1950, the German team elaborated concepts and improvements for extended payload and range under the projects G-1, G-2 and G-4. The German team had to remain on Gorodomlya island until as late as 1952 and 1953. In parallel, Soviet work was focused on larger missiles, the R-2 and R-5, based on further developing the V-2 technology with using ideas of the German concept studies.[98] Details of Soviet achievements were unknown to the German team and completely underestimated by Western intelligence until, in November 1957, the Sputnik 1 satellite was successfully launched to orbit by the Sputnik rocket based on R-7, the world's first intercontinental ballistic missile.[99]

In the autumn of 1945, the group led by M. Tikhonravov K. and N. G. Chernyshov at NII-4 rocket artillery institute of the USSR Academy of Sciences developed on their own initiative the first stratospheric rocket project. VR-190 called for vertical flight of two pilots to an altitude of 200 km using captured German V-2 rockets.[100]

V-2 rocket located at the Australian War Memorial Treloar Centre Annex

A rusty V-2 engine in the original underground production facilities at the Dora-Mittelbau concentration camp memorial site.

V-2 on display in Musée de l'Armée, Paris.

At least 20 V-2s still existed in 2014.

United Kingdom

The propulsion unit from a V-2 that broke up in air on display (with exhaust-exit pointed up) Norfolk and Suffolk Aviation Museum

• One at the Science Museum, London.[108]
• One, on loan from Cranfield University, at the Imperial War Museum, London.[109]
• The RAF Museum has two rockets, one of which is displayed at its Cosford site. The Museum also owns a Meillerwagen, a Vidalwagen, a Strabo crane, and a firing table with towing dolly.[110]
• One at the Royal Engineers Museum in Chatham, Kent.
• A propulsion unit (minus injectors) is in Norfolk and Suffolk Aviation Museum near Bungay
• A complete turbo-pump is at Solway Aviation Museum, Carlisle Airport as part of the Blue Streak Rocket exhibition.
• The venturi segment of one discovered in April 2012 was donated to the Harwich Sailing Club after they found it buried in a mudflat.[111]
• Fuel combustion chamber recovered from the sea near Clacton at the East Essex Aviation Museum, St Oysth
• A gyroscope unit is on display at the National Space Centre in Leicester.[112]
• A turbo pump unit on display at the National Space Centre in Leicester.[113]
• A steam generating chamber on display at the National Space Centre in Leicester.[114]

• V-1 flying bomb
• V-3 cannon

Look up v-2 rocket in Wiktionary, the free dictionary.

Wikimedia Commons has media related to V-2 missiles.

• History of Peenemünde and the discovery of the German missile development by the Allies
• '"Chute Saves Rockets Secrets", September 1947, Popular Science article on US use of V-2 for scientific research
• Reconstruction, restoration & refurbishment of a V-2 rocket, spherical panoramas of the process and milestones.
• Hermann Ludewig Collection, The University of Alabama in Huntsville Archives and Special Collections Files of Hermann Ludewig, Deputy of Design Chief and later Chief of Acceptance and Inspection on the V-2 program