The Year of '21

The years aircraft: Vickers Vernon

July 16 – The sixth annual Aerial Derby is held, sponsored by the Royal Aero Club, with a trophy and a £500 prize for the overall winner and prizes of £200, £100, and £50 for the first three places in the handicap competition. Nineteen participants fly over a 102.5-mile circuit beginning and ending at Hendon Aerodrome in London with control points at Brooklands, Esher, Purley, and Purfleet; the aircraft fly the circuit twice. J. H. James is both the overall winner and the winner of the handicap competition, completing the course in a Gloster Mars at an average speed of 163.34 mph in 1 hour 18 minutes 10 seconds with a handicap of 4 minutes 42 seconds.