A Very Unusual Air War: From Dunkirk to AFDU: The Diary and Log Book of Test Pilot H. Leonard Thorne, 1940-45

By H. Leonard Thorne

In May 1940, 20-year-old Len Thorne joined the RAF, as did many young men during the Second World War. After two hectic tours of operational duty as a fighter pilot, including some desperately dangerous low-level flying at Dunkirk, he was posted to AFDU (Air Fighting Development Unit) and remained there as a test pilot for the rest of the war.

Fortunately for us, Len kept a detailed diary, which, set alongside his log book, tells the unique story of a test pilot tasked with developing operational tactics and testing captured enemy aircraft, such as the feared Fw 190. During Len's career, he worked alongside some of the most famous fighter aces and his records cast light on some of the most famous flyers of the RAF, including Wing Commander Al Deere and Spitfire aces Squadron Leader ‘Paddy’ Finucane, Ernie Ryder and many others.

A unique record of military aviation history, From Spitfire to Focke Wulf offers a window to this era of rapid and high-stakes aircraft development.

• Language: English
• Publisher: The History Press
• Release date: Sep 2, 2013
• ISBN: 9780752497280

H. Leonard Thorne

LEONARD THORNE was born in 1920 in the village of Waddesdon, Buckinghamshire. He studied at grammar schools in Aylesbury, Birmingham, Tewkesbury and Slough. After matriculation he joined High Duty Alloys in Slough and then moved with the company to Redditch. He joined the RAF in May 1940. Len died in 2008. His diary and log book have been collated by Gill Griffin and Barry Griffin, his daughter and his son-in-law.