by Sperry Gyroscope relied on propellers. While employed by the company, Fritz Gosslau developed a remote-controlled target drone, the FZG 43 (Flakzielgerat-43). In October 1939, Argus proposed Fernfeuer, a remote-controlled aircraft carrying a payload of one ton, that could return to base after releasing its bomb. Argus worked in co-operation with C. Lorenz AG and Arado Flugzeugwerke to develop the project. However, once again, the Luftwaffe declined to award a development contract. In 1940, Schmidt and Argus began cooperating, integrating Schmidt's shutter system with Argus' atomized fuel injection. Tests began in January 1941, and the first flight made on 30 April 1941 with a Gotha Go 145. On 27 February 1942, Gosslau and Robert Lusser sketched out the design of an aircraft with the pulse-jet above the tail, the basis for the future V-1. Lusser produced a preliminary design in April 1942, P35 Efurt, which used gyroscopes. When submitted to the Luftwaffe on 5 June 1942, the specifications included a range of , a speed of , and capable of delivering a warhead. Project Fieseler Fi 103 was approved on 19 June, and assigned code name Kirschkern and cover name Flakzielgerat 76 (FZG-76). Flight tests were conducted at the Luftwaffes coastal test centre at Karlshagen, Peenemünde-West. Milch awarded Argus the contract for the engine, Fieseler the airframe, and Askania the guidance system. By 30 August, Fieseler had completed the first fuselage, and the first flight of the Fi 103 V7 took place on 10 December 1942, when it was airdropped by a Fw 200. Then on Christmas Eve, the V-1 flew , for about a minute, after a ground launch. On 26 May 1943, Germany decided to put both the V-1 and the V-2 into production. In July 1943, the V-1 flew 245 kilometres and impacted within a kilometre of its target. The V-1 was named by Das Reich journalist Hans Schwarz Van Berkl in June 1944 with Hitler's approval. Description The V-1 was designed under the codename (cherry stone) by Lusser and Gosslau, with a fuselage constructed mainly of welded sheet steel and wings built of plywood. The simple, Argus-built pulsejet engine pulsed 50 times per second, and the characteristic buzzing sound gave rise to the colloquial names "buzz bomb" or "doodlebug" (a common name for a wide variety of flying insects). It was known briefly in Germany (on Hitler's orders) as (May bug) and (crow). Power plant The