Tom,
The man you need to contact is John Cowper in the Brough Heritage Group. He was the aerodynamicist responsible for stability and control for many years. The group normally come in to Brough on a Thursday late morning/early afternoon and I still occasionally go and ask him questions (on Hawk) when I am really stuck for information. I will look up the Heritage Group phone number when I am at work tomorrow and PM you the details.
Walbut