This engine took over from the Tee Dee.15 as "THE" Cox engine for FAI racing, combat and free flight for many more years until the Russian AAC Engines came along. This engine was patterned on the Australian designed 1973 Taipan 2.5cc Twin Ball Race engine by Gordon Burford. The entire top end of the Cox Conquest and the Taipan TBR are interchangeable. The Taipan TBR was based on the Rossi MkII so the top end is also interchangeable with a Rossi MkII. Also came in R/C version Cat# 2810. As a result of reorganization within Leisure Dynamics who owned Cox and K&B at the time, production of this engine was handed over to K&B and it became known as the K&B Cox Conquest after 1978. Production continued for a number of years when in 1990 the engine and rights were sold to MECOA owned by Randy Linsalato where it continued on as the RJL Cox Conquest for some time.