BMW IV
…water-cooled inline aircraft engine built in Germany in the 1920s. Power was in the 180 kW (250 hp) range. On 17 June 1919 Franz Zeno Diemer flew a DFW F37, powered by a BMW IV engine to an unofficial world record height of 9,760 m (32,021 ft) from Oberwiesenfeld, reaching that altitude in 89 minutes…