The Bonomi BS.9 Bertina II was a single seat glider with a layout somewhere between that of a flying wing and the conventional, tail stabilized arrangement.
A short, simple, cruciform cross-section beam ran back to the empennage, appearing in elevation like a fine boom but from above seen to begin with almost the width of the wing centre section, narrowing rearwards.
A second form, seen the diagram and also in all the photographs has the glider with a shortened fuselage ending under the wing at around the one third chord point, reducing the overall length to about 3.70 metres (12 feet 2 inches).
This version also had vulnerable, lozenge shaped, fixed end plate fins on its tips, extending both above and below the wing, and a double skid undercarriage, forming a sledge-like arrangement held well away from the fuselage and suitable for snow.
[2] Being small, very light, easy to rig in the absence of flying wires and ski-equipped, the Bertina II was very suitable for gliding in mountainous regions from snowy, hard to access fields.