Designed and built by the late Wing Commander Ken Wallis. Remained part of his private collection at Reymerston Hall until his death in 2013. Between November 1965 and April 1971 this autogyro was registered 4R-ACK. On 28th September 1975 it set a World non-stop straight line distance record for an autogyro by flying 874.3Km between Lydd and Wick. At the time this also resulted in an endurance record of 6 hours 25 minutes. Ken Wallis was the pilot.