Hitler's Terror Weapons, Brooks, Geoffrey [cat reading book .txt] 📗

out the hard way that a successful launch of the V-2 was virtually impossible four days or so after manufacture and a procedure known as heisse Semmel (hot dumplings) was in force on land whereby any V-2 to be used operationally was fired within three days of manufacture.19 Clearly a V-2 could not be fired after thirty days in a damp transatlantic barge and so the US idea was shelved. In early December 1944 orders were placed with Stettiner Vulkanwerft and Schichau Werft Elbing. It seems self-evident that there must have been a plan to use these barges to bring Britain under V-2 fire from the North Sea.

In 1946, the Deputy Commanding General of Army Air Force Intelligence, Lt-Gen Donald Leander Putt, told the Society of Aeronautical Engineers: “The Germans were preparing rocket surprises for the whole world in general and England in particular which would have, it is believed, changed the course of the war if the invasion had been postponed for so short a time as half a year.” Putt was also quoted in an aside as having stated that “the Germans had V-2s with atomic explosive warheads”. A surprise is a surprise and hitherto ordinary rocket warfare had proved unproductive. The range of the V-2 was 200 miles. The crucial success of the Allied progress by December 1944 had therefore been to drive the German forces in Europe beyond this limit. The objective of the Ardennes campaign was the Belgian port of Antwerp, 200 miles from London. It was served by a short rail connection from Germany and its recapture was essential for a renewed V-2 offensive. Furthermore it was immediately available as a U-boat and Lafferenz barge base. The A-9 “winged V-2” project was resurrected in 1944/45. German testimonies allege that at least one successful test launch was made from the Harz in March 1945, and in mass production this rocket could have hit London from central Germany.

The V-3

Few commentators seem to be in any doubt but that the V-3 was the “High Pressure Pump” or “England Gun”. Paul Brickhill recorded in TheDam Busters:

“the greatest nightmare of all was the great underworld being burrowed under a 20-foot-thick slab of ferro-concrete near Mimoyecques (between Calais and Boulogne). Here Hitler was preparing his V-3. Little has been told about the V-3, probably because we never found out much about it. The V-3 was the most secret and sinister of all – long-range guns with barrels 500 feet long!”

The V-3 was probably based on the 1885 unsuccessful ballistic principle of the Americans Lymann and Haskell and Baron von Pirquet’s concept of sequential, electrically activated, angled side chambers to provide additional velocity to a shell during its passage of an immensely long tube.

In mid-1942 August Cönders, chief engineer of the Röchling Iron and Steel Works, Leipzig, rediscovered the principle while reading through technical dossiers captured by the Germans in France in 1940. He worked out an improved design and approached Armaments Minister Speer with the idea. Hitler was enthusiastic and demanded that the development should proceed immediately.

The design was for a gun consisting of numerous lengths of smoothbore metal tubing bolted together to form a barrel up to 124 metres long. Every 3.65 metres along its length was a lateral combustion chamber set at from 45° to a right angle. The shell and main propellant were loaded into an sFH18 heavy field howitzer breech. When the gun was fired, the projectile would be impelled forward by pressure from a gas cartridge, and on passing each chamber it triggered electrically another cartridge positioned there which gave the shell further velocity. This was repeated throughout its transit of the barrel. The electrical activation solved a detonation problem which had been caused by expanding gases detonating the auxiliary chambers before the arrival of the shell. The muzzle velocity was around 1500 metres/sec which was significantly greater than that of standard artillery and provided a range of about 160 kilometres. The original 10-inch calibre projectile was over nine feet in length and weighed 140 kilos with a 25-kilo warhead. Six wings opened in flight for stability. Twenty-five guns were projected which at full output would have enabled London, 150 kilometres distant, to be subjected to a persistent rain of up to 200 ten-inch calibre shells per hour. For this reason the project was nicknamed fleissiges Lieschen, Busy Lizzie. The Heereswaffenamt, or German Army Weapons Office, contracted with firms such as Skoda, Krupp, Röchling, Witkowitz Iron and Steel, Faserstoff, Fürstenberg and Bochumer Verein for various calibres of ammunition. Towards mid-1944 20,000 shells were completed or under production.

Even before the gun trials had begun, work was started in the late summer of 1943 on a vast, well camouflaged underground gun battery to house twenty-five barrels of the HPP on the Channel coast at Mimoyecques. The barrels were to be sunk in shafts at a 50° angle 150 feet down into the ground. A slave labour force of 10,000 persons was involved in the construction and information was soon passed to London about a new mammoth “underground V-1 site”.

The initial tests were carried out using barrel lengths between 50 and 130 metres, first at Hillersleben and then from a range at Misdroy near Peenemünde at the beginning of 1944. Various permutations of barrels and chambers were tried without much success. Shells were supplied by numerous manufacturers. In tests between 21 and 23 March 1944 it was found that at muzzle velocities above 1100 metres/sec the tubes lost stability and developed metal stresses. General Leeb recommended that the project be stopped for investigations. By May 1944 the gun had an acceptable range of 95 kilometres and experiments were stepped up to find ways of increasing muzzle velocity. Before any guns were delivered, the Mimoyecques emplacement was destroyed on 6 July 1944 by RAF aircraft using a 12,000-pound Tallboy bomb. This signalled the end of the project for the long-range bombardment of London and put the entire V-3 project in question.

Nevertheless further trials with the HPP with