The Westland Whirlwind belongs to that category of aircraft which entered production but failed to live up to their designers' expectations. Its unreliable engines can be seen as a major reason for this but it only serves to hide other serious problems. Indeed, even with better engines the results would probably have been the same, as the concept of a twin-engined fighter aircraft capable of meeting single-engined fighters escorting bombers formations on an equal footing was fallacious, as combat in WW2 was soon to prove. Only two squadrons flew the Whirlwind, Nos. 137 and 263 Squadrons. This book is a deeply revised edition of Allied Wings No. 4 published in 2013, with the text largely enhanced and new photographs added. In all 60 photos and 12 colour profiles.