 Like the original DASH, SEAMOS was a coaxial-rotor drone helicopter with twin landing skids, though it was unsurprisingly a more refined system, and in particular even had a real fuselage.SEAMOS was powered by an Allison 250-C20W turboshaft engine with 315 kW (420 shp).SEAMOS flight tests were performed with the technology demonstrator in 1991, leading to a production contract in 1996 and flight tests of a true prototype in 1999.