High Quality Content by WIKIPEDIA articles! The de Havilland Gipsy Queen is a British six-cylinder aero engine of 9 litres (550 cu in) capacity that was developed in 1936 by the de Havilland Engine Company. It was developed from the de Havilland Gipsy Six for military aircraft use. Produced between 1936 and 1950 Gipsy Queen engines still power vintage de Havilland aircraft types today.