The Ariete was the second design by Ing. Sergio Stefanutti and built
by Aerfer. It differed mainly from its predesessor Sagittario (Archer)
2 by the altereations to the fuselage to adopt the 1,810 lb (821 kg)
s.t. Rolls-Royce Soar R.Sr.2 turbojet in addition to the 3,600 lb
(1,633 kg) s.t. Rolls-Royce Derwent 9 turbojet. The Soar engine was
used to boost performance on takeoff, climb and combat, air was fed
through a retractable dorsal intake. First flight of the sole aircraft
was made on March 27, 1958. A planned third design, the Leone (Lion),
also with mixed-power, was abondoned.