The S-51 was an early postwar development of the R-5. Although intended for the civilian market, most S-51s went into military service. They served with all the US military services as well as with the air forces of Australia, Britain, Canada and France. The seven RCAF S-51s were designated H-5. The first helicopters in the RCAF, they were used mainly for training and experimentation, although some did search-and-rescue work. All H-5s were retired by the mid-1960s. The United States built 214, and 165 were made in Britain. Harold A Skaarup Web Page
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