Scarab S-50 A 7-cyl. air-cooled radial engine introduced in 1928. With a bore and stroke of 4.25 inches and a compression ratio of 5.2:1, the Scarab developed 125 hp (93 kW) at 2,050 rpm from 422 cu in (7 l) with a dry weight of 285 lb (129 kg). Scarab Junior A 5-cyl. version introduced in 1930 developing 90 hp (67 kW) at 2125 rpm from 301 cu in (5 l) with a dry weight of 230 lb (104 kg).