before world war i, rapp produced both in-line 6-cylinder and v8 cylinder water-cooled aeroengines. the in-line 6-cylinder produced 125 hp @ 215 kg (474 lb); with a 901 cu in (14.8-litre) displacement. soon, the company made the rapp ii, which increased the power output to 150 hp @ 260 kg (573 lb). shortly thereafter, early into world war i, the rapp iii 175 hp (actual 162 hp @ 1400 rpm) 295 kg (651 lb) six-cylinder aeroengine was manufactured. the v8 they developed was 1201 cu in (19.7-litre), producing 200 hp @ 300 kg (661 lb).