 Initial flights were in the summer of 1961, at first with a pilot on board, leading up to an unpiloted helicopter flight in August 1961.A second-generation prototype, the "DSN-2", was powered by two Porsche engines, each with .Three such drones were built, and then led to the production DASH, the "DSN-3", which was powered by a Boeing T50-BO-8A turboshaft engine with 225 kW (300 shp).