The Hillson FH.40 Hawker Hurricane biplane was an experimental aircraft designed to test the concept of the ‘slip-wing,’ which was discarded from the craft after take-off and climb. Lauded as one of the most exciting innovations of its time, surprisingly the development of the slip-wing was not overseen by any major manufacturer, but instead by a business which originally made the majority of its money outside of the aeronautical industry. https://planehistoria.com/wwii/hillson-fh-40-hurricane/