R-23 rigid airship. Aircraft model for MSFS2004. FREEWARE (c) Alexander Belov, 2010. R-23 belongs to the first class of rigid airships ordered by the British Admiralty in 1915. No 23 and No 26 was built by Vickers, No 24 by Beardmore, and No 25 by Armstrong-Whitworth. The first three entered service in October 1917, joined by R. 26 in April 1918, but further planned models were cancelled. Mainly used for training and experimental purposes, the 23 Class undertook only limited patrol work and all four were scrapped in 1919.