OK, so hands up all those who got the Herald ARB exam paper which had the "What is the Irving Beak" question? Yours truly's response to reading this was: "The Irving *******
what??!!"
The Irving Beak is an aerodynamic mass balance in the leading edge of the rudder - that notch-shaped discontinuity which shows well in the photo of G-CEAS, above the rose. I'd never come across it before, or since, so perhaps it's unique to the Herald. The technical manual mentioned it once, in passing, but needless to say some bright spark at the ARB seized upon it with glee!
