Hi Genghis
Thanks for that. I will include this problem that you have posed in my research work, it looks interesting (and I have just become curious now).
I see that you are a FRAeS. Last November I attended a Maintenance & Airworthiness workshop at the Aerosociety in London, which was really interesting, and a lot of the independent research I am doing is to contribute to some of the issues being discussed in that field at the time. If you read the Aerospace mag, I had a letter printed in last November's issue (if I remember rightly), which revolves around what I am doing, and hopefully more will come out of that.
So thanks for taking the time to always respond to my posts and surveys on this forum as you have done ever since I first posted when I was a student. Much appreciated.
Kind regards, Delphine