Flight, August 1923
GOTHENBURG International Aero Exhibition 1923
The Swedish Exhibit
The second large machine is a two-seater fighter and reconnaissance biplane with Maybach engine (240-300 h.p.). It does not present any very unusual features,
except that the rear portion of the fuselage is of triangular section, the lower longerons converging rapidly just aft of the gunner's cockpit. The radiator is mounted on the nose of the top centre-section, which gives the machine a somewhat German appearance. The main characteristics of this machine, the S.21, are as follows: Engine, 230-300 h.p. Maybach; weight of machine empty, 1,100 kg. (2,210 lbs.); weight fully loaded, 1,600 kg. (3,520 lbs.); speed at 1,000 m., 170 km. (105 m.p.h.); speed at 3,000 m. (10,000 ft.), 180 km. (111 m.p.h.); ceiling, 6,500 m. (21,300 ft.).