The Bonomi BS.20 Albanella (English: Montagu's harrier) was a performance sailplane designed and built in Italy in the late-1930s.
The BS.20 Albanella is not well documented and the little that is known about it comes a hand-written note on its general characteristics, a number of photographs taken at Milan in the mid-1930s and a sketch on a postcard.
Its oval cross-section fuselage was conventional at the front, with the pilot's open cockpit just ahead of the leading edge with an eye-line over the upper wing.
The main landing gear was a sprung ventral skid stretching from near the nose to below the wing trailing edge.
The vertical tail was straight tapered to a rounded tip with a rudder extending down to the keel and operating in an elevator cut-out.