12/29/2014. Remarks by Johan Visschedijk: "The Type 133 was the first prototype for the RAF with retractable landing gear, and was also notable for its fully cowled engine, cantilever wings, and drooping ailerons. The airframe was an all-metal structure with Alclad stressed skinning except for the fabric covered fin and control surfaces, and the wings were of the inverted gull type with rearward retracting Seversky-type main landing gear units under their angles. The Type 133 was designed to conform with a 1930 requirement, and the construction of a single private venture prototype was undertaken during March 1933.

Carrying the 'Class B' identity marking R-10, the prototype made its first flight in June 1934 powered by a 640 hp Bristol Mercury VIS.2 radial piston engine, and received enthusiastic reports. Changes effected as a result of flight trials were more effective brakes, alteration of the drooping ailerons to separate flaps and ailerons, replacement of the tail skid by a tail wheel, installation of a sliding hood and crash pylon for the cockpit, and revision of the engine with an exhaust collector ring and a long-chord cowling. The Type 133's armament comprised two Vickers machine guns in the forward fuselage and a single Lewis gun above each main landing gear unit.

Further trials confirmed the Type 133's initial promise, but the prototype was lost in a spinning accident in March 1935 and further development was abandoned."