Encyclopedia Astronautica
A5



ya5mw.jpg
A5
Credit: © Mark Wade
German test vehicle. Subscale test model of A4 (V-2). Replaced the A3 in this role after its unsuccessful test series. The A5 used the same powerplant as the A3, but had the aerodynamic form of the A4 and a new control system. 25 all-up versions were flown, some several times.

The recovery sysem consisted of a drogue and main parachute. Many others with no propulsion system or using a monopropellant system were built for air-drop tests. The A5 was flown from 1938 to 1942, and was essential in refining the aerodynamics and other technology for the A4. Propellants Lox/75% alcohol.

to a: 8.8 km. Launch data is: complete.

Status: Retired 1942.
Gross mass: 900 kg (1,980 lb).
Height: 5.82 m (19.09 ft).
Diameter: 0.78 m (2.55 ft).
Thrust: 15.00 kN (3,372 lbf).
First Launch: 1939.10.01.
Number: 1 .

More... - Chronology...


Associated Countries
See also
  • A4 The V-2, known as the A4 to its developers, was the basis for most of the rocketry that exists in the world today. It was ineffective as a weapon of war, but represented a quantum leap in technology. The A1, A2, A3, and A5 were steps in the development of the missile. Later versions - the A6 through A12 - were planned to take the Third Reich to the planets. More...

Associated Manufacturers and Agencies
  • Von Braun American manufacturer of rockets and spacecraft. Von Braun, USA. More...

Bibliography
  • Emme, Eugene M, Aeronautics and Astronautics: An American Chronology of Science and Technology in the Exploration of Space 1915-1960, NASA, 1961. Web Address when accessed: here.
  • Michels, Juergen and Przybilski, Olaf, Peenemuende und seine Erben in Ost und West, Bernard & Graefe, Bonn, 1997.
  • Dornberger, Walter, Peenemuende, Moewig, Berlin 1985..

Associated Launch Sites
  • Peenemuende First launch site in the world, used for development of the V-1, A-4/V-2, Wasserfall, and other missiles. Among many major facilities, engine test stands were built that were capable of accommodating planned engines for the A-10 intercontinental missile. 296 known launches were made from the site between 1937 and 1945. More...

A5 Chronology


Spring 1938 - . Launch Site: Peenemuende. LV Family: V-2. Launch Vehicle: A3; A5.
  • A5 delivered to Peenemuende. - . Nation: Germany. The first A5 drop test model is delivered to Peenemuende just weeks after the third A3 test. Production is planned at a rate of 10 per month to define the A4 aerodynamic configuration. Objective of the first tests is to break the sound barrier - in the wind tunnel no configuration of fins had managed to go through the barrier without disintegrating. The only test possibility was to drop the model from a great height, and let gravity accelerate it to supersonic speeds. The model weighs 250 kg and is 1.6 m long and 20 cm in diameter.

Summer 1938 - . Launch Site: Peenemuende. Launch Vehicle: A5.
  • A5 launches from Greifswalder Oie - . Nation: Germany. Apogee: 12 km (7 mi). In the summer of 1938 the decision is made to go ahead with four A5 tests from Greifswalder Oie without the stabilising system or a parachute. The first missile ascended into a low wind, and reached 8 km altitude, nearing but not exceeding the sound barrier. Maximum altitude reached in the test series is 12 km.

September 1939 - . Launch Site: Peenemuende. LV Family: V-2. Launch Vehicle: A5.
  • First A5 drop test. - . Nation: Germany. The model is dropped from a He-111 bomber from 7000 m. It breaks through the sound barrier at 1000 m altitude at a speed of 360 m/s. The stabilising fins keep the maximum oscillation of the model to within 5 degrees from vertical. The drogue ring parachute then deployed to decelerate the model to 100 m/s, followed by the main parachute which slows it to 5 m/s when it impacts in the ocean.

September 1938 - . Launch Site: Peenemuende. LV Family: V-2. Launch Vehicle: A5.
  • A5 stabilisation system tests - . Nation: Germany. In order to test the A4's stabilisation system, Walter, Kiel, is subcontracted to build a large number of model A5's. Like the drop test models, these are 20 cm and 1.6 m long. However they weigh only 47 kg gross lift-off mass, with a 27 kg empty mass. The rocket engine burns 85% hydrogen peroxide monopropellant using a calcium permanganate catalyst. The engine produces 120 kgf for 15 seconds, and has an exhaust velocity of 1000 m/s. The design objective is a low cost, reliable, and simple rocket, which will allow a large number of trail-and-error test launches to be made within a tight budget. The fins developed for the A4 as a result of these tests were shorter and wider than those of the A3. They owed nothing to aircraft wing designs of the times, which couldn't withstand supersonic speeds. But they were still too affected by the wind, tending to set the rocket on a rotation around its long axis during ascent.

October 1939 - . Launch Site: Peenemuende. Launch Vehicle: A5. Failed Stage: 1.
  • A-5 development rockets with gyroscopic controls and parachutes - . Nation: Germany. Related Persons: von Braun. Apogee: 7.00 km (4.30 mi). New test series at Greifswalder Oie. The island had changed a lot, with massive new concrete installations. Three A3's were flown with a new Siemens control system. The first was launched vertically, reaching 7 km at 45 seconds into the flight at the time of engine cut-off. Both the drogue and main parachutes functioned correctly, and the rocket splashed down in the harbour and was recovered a half hour later by a motor boat (the rocket could float for up to two hours before water entering the empty propellant tanks would sink it).

October 1939 - . Launch Site: Peenemuende. LV Family: V-2. Launch Vehicle: A5.
  • Second functional A5 launch. - . Nation: Germany. Apogee: 7.00 km (4.30 mi). Summary: This was a vertical launch, replicating the first launch of the series, and was again recovered successfully..

October 1939 - . Launch Site: Peenemuende. LV Family: V-2. Launch Vehicle: A5.
  • Third functional A5 launch. - . Nation: Germany. Apogee: 4.00 km (2.40 mi). Range: 6.00 km (3.70 mi). This was the first test of the pitch-over manoeuvre required for the operational A4. The test went perfectly - the rocket pitched over 4 seconds after lift-off, reaching 4 km altitude, and was 6 km downrange from the launch point when the drogue parachute deployed. The rocket was recovered from the ocean successfully. This was finally a complete success after seven years of developmental effort. But the rocket had not broken the sound barrier.

October 1939 - . Launch Site: Peenemuende. LV Family: V-2. Launch Vehicle: A5.
  • Further A5 test launches. - . Nation: Germany. Apogee: 18 km (11 mi). Summary: The German rocket team successfully fired and recovered further A5 development rockets with gyroscopic controls and parachutes, attaining altitude of 12 km and a range of 18 km..

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