Two reports: 'The aerodynamic derivatives with respect to sideslip for a delta wing with small dihedral at supersonic speeds' by Sqn Ldr John Hunter-Tod and Abraham Robinson (College of Aeronautics, Cranfield, Dec 1950); 'The aerodynamic derivatives with respect to a rate of yaw for a delta wing with dihedral and at incidence at supersonic speeds' by Sqn Ldr J H Hunter-Tod (HMSO, 1957).