Following success of the smaller A.R.1 (Admiral Rotary 1), which was later renamed Model B.R.1 for Bentley Rotary 1, the larger B.R.2 rotary aircraft engine powered a variety of World War I aircraft, including, among others, the: Sopwith F.1 Camel and 7F.1 Snipe; Nieuport B.N.1; and Vickers F.B.26A Vampire II. Humber Ltd., one of five British companies that manufactured this model during World War