HDMS Helgoland
HDMS "Helgoland" was a coast defence barbette ironclad bult for the Royal Danish Navy in the late 1870s. The ship was decommissioned in 1907 and subsequently scrapped. Design and description. "Helgoland" was long overall, had a beam of and a draft of . She displaced and was fitted with a ram bow. Her crew consisted of 350 officers and enlisted men. The ship was fitted with a pair of Burmeister & Wain compound-expansion steam engines, each engine driving one propeller shaft using steam provided by eight cylindrical boilers. The engines were rated at a total of and gave the  ship a speed of . "Helgoland" carried a maximum of of coal that gave her a range of at a speed of . The ironclad's main battery consisted of a single 22-caliber rifled breech-loading (RBL) gun mounted in the barbette. She was also armed with four single 22-caliber RBL guns in the corners of the armored citadel in the hull. For defense against torpedo boats, the ship was equipped with five 25-caliber guns. She was also fitted with two torpedo launchers. "Helogland" had a complete waterline belt of wrought iron that ranged in thickness from amidships to  at the ends of the ship. The barbette and the side of the armored citadel were protected by 260 mm of armor. The deck armor was thick while the conning tower was protected by armor plates. Construction and service. "Helgoland", named for the 1864 Danish victory over the combined Prussian and Austro-Hungarian squadron at Battle of Heligoland during the Second Schleswig War, was laid down on 20 May 1875 by the Orlogsværftet in Copenhagen, launched on 9 May 1878 and commissioned on 20 August 1879.