Schlitzrohrschleuder system was a chemical steam catapult that was used until the end of the war. The Fi 103 flying bomb, later called a Vergeltungswaffe ("revenge weapon") or V1, was fired into the air at a speed of 350 km/h from the Walter launch system (catapult) using a steam piston. The piston was released and the Fi-103 flew on under its own pulsating jet engine. The buildings of the test site, constructed on piles in the lake, were blown up after the war by the Allies. Politics Although Bosau lies in the district of Ostholstein, it has belonged since 1 January 2007 to the Amt of Großer Plöner See, whose other parishes belong to Plön district, which also acts as the supervisory authority over the Amt. The Amt is managed by the higher council for the municipality of Bosau in Hutzfeld. The seat of the Amt is, however, in the town of Plon which does not belong to it. Parish council Following the 2008 local elections, of the 19 seats on the parish council, the CDU has had nine seats, the SPD and the Voter's Union (WGB) have had four each and the FDP two seats. Mayors 1945-1946: Hans Sievert 1946-1950: Wilhelm Wulf 1950-1959: Alfred Ahrens, SPD 1960-1984: Günter Vogel, independent 1984-2001: Joachim Herrmann, independent since 2001: Mario Schmidt, independent Coat of arms Emblazonment:"Divided. On the left in blue, a silver stylized eagle head with the beak up, on the right in red a golden lion rampant. " The coat of arms was chosen by the community after the Second World War, in the absence of official seals that were free from Nazi and imperial symbols, and approved by the British military government. Twinning Saujon in the French département of Charente-Maritime, between La Rochelle and Bordeaux; 6,281 inhabitants. Economy and infrastructure Bosau is a recognised climatic spa (Luftkurort) with over 100,000 guest-nights per year. The Baltic Sea coast is about 20 km away. Sons and daughters of the town Helmold of Bosau (ca. 1120 – after 1177), Saxon historian and parish priest of Bosau Hugo Süchting (1874–1916), chess player Johann Heinrich Böhmcker (1896–1944), Mayor of Bremen Hans-Heinrich Sievert, Dr. (1909–1963), light athlete and Olympic competitor Sources Habich, Johannes and Hartenstein, Matthias (1982). Die Kirche zu Bosau am Plöner See. Königstein i. Ts. o. J., Führer zu vor- und frühgeschichtlichen Denkmälern, Band 10: Hansestadt Lübeck - Ostholstein - Kiel. von Zabern,