>599: maybe you are remembering: The Man “who put power into the Merlin” Sir S.Hooker, Not Much of an Engineer{Airlife,84}:<
It may well have been; either there or L J K Setright's classic The Power To Fly. Unfortunately I lent my copy of Hooker to someone and it never managed to RTB.
Is it a vicious rumour or is there any truth in the anecdote that no two Tucanos are the same size?