Vickers Vendace
The Vickers Vendace was a 1920s British trainer aircraft. It was originally designed as a floatplane trainer for the Royal Air Force. Background. In October 1924, the British Air Ministry issued Specification 5A/24 for a floatplane trainer. To meet this requirement, Vickers designed a two-seat biplane, the Vickers Type 120 Vendace I. In August 1925, the Air Ministry placed an order for a single prototype, in addition to competing aircraft from Parnall and Blackburn, (the Parnall Perch and Blackburn Sprat). Design and development. The Vendace I was a two-bay biplane with folding wooden wings and a  steel tube fuselage, powered by a Rolls-Royce Falcon engine. Its undercarriage could be changed from floats to wheels in ten minutes, while its fuel supply was held in two streamlined tanks above the upper wing. The first Vendace first flew at Brooklands by March 1926, and then underwent successful trials as a landplane, including operation from the aircraft carrier . In 1927, these were followed by testing in seaplane configuration at the Marine Aircraft Experimental Establishment, Felixstowe. The trials were successful, with the Vendace being selected to meet the RAF's needs. The requirement was soon cancelled as a cost  saving measure, although the RAF did retain the aircraft for experimental purposes. Vickers built a second aircraft, the Type 157 Vendace II, as a private venture, with an ADC Nimbus (an inline six-cylinder engine derived from the Siddeley Puma) that replaced the Falcon of the Vendace I. It first flew in November 1927, and was sold to the Aircraft Operating Company for survey operations in South America. Development continued with the Type 155 Vendace III powered by a Hispano-Suiza 8F, and three were sold to Bolivia for use as trainers, at a cost of £ 9,997 for the  three aircraft. Operational history. In July 1929, the three Bolivian Vendaces entered service with the Escuela Militar de Aviación. While the Vendaces maintained good performance at the high altitude of Bolivia's training airfield at La Paz, they experienced engine problems, blamed on dusty conditions in the Bolivian summer, resulting in the aircraft being grounded several times while waiting for spare parts for the engines to be delivered from France. Two Vendaces were listed as still being in service in 1933, with one being used as a communications aircraft during the Chaco War before being destroyed by Bolivian forces during  a retreat in December 1933.