A powered version of Militi's M.B.1 flying-boat glider the Leonardo is a parasol-wing monoplane with a two-step hull and a fuselage of aluminium alloy, wood and fibreglass. The mixed construction wing is supported by two N-form cabane struts in the centre and a V-strut outboard on each side; it has plain ailerons but no flaps. The pilot has an open cockpit with a small windscreen. The 420NaN0 modified Panhard motor car engine is strut-mounted above the wing centre section and drives a two-bladed fixed-pitch laminated wood pusher propeller. The aircraft was first flown on 21 June 1970 and was exhibited at the 1972 Turin Air Show.