By 1924 the Soviet aircraft industry had started to turn out home-designed airplanes in numbers and as a result many of the foreign types that had been in service could at last be scrapped. Before 1924 the collection of aircraft that were in service was really amazing. Almost any airplane that had been in service in either the British, French, or German air forces in the last year or so of the war was there in small numbers, plus many that had been captured or left behind by the allies in support of the various forces involved in the chaos after the revolution. Nobody could try to service such a motley collection for long, which is why the Soviet forces were determined to have their airplanes designed and built at home, and to get rid of all the foreign machines at the earliest possible moment, apart from matters of prestige. One machine that was kept on for a long time was a trainer. The Russians built their own version of the famous Avro 504 for many years, calling it the U-l.
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