Footless Halls it was the Halifax I and early IIs with the triangular vertical fin that had the rudder overbalance problem. This was cured by fitting the rectangular fins to the B II Mk V. This configuration was carried on through the rest of the Halifax & Halton production run. Apparently this was only done when Butcher Harris personally called Fred Handley-Page and said something on the lines of "please stop your aeroplanes killing my aircrew".