 Other improvements included aluminium alloy structure in the triple finned biplane tail unit, which was built with inverse camber to improve the stabilising downforce.Eighteen R.VIs were built serialled 'R25' to 'R39' and 'R52' to 'R54' all except 'R30', which was used exclusively as a supercharged engine test-bed, saw service in the "Luftstreitkräfte" with Rfa500 and Rfa 501 on the western front stationed in the Ghent area.Air raids on England by R.VIs began on 17 September 1917.