Hello Michael, At first I thought I understood Pilou's reply - unfortunately tests then proved that I didn't !

However your response made everything clear - so hopefully I will have no more problems of this sort.

I plan to follow up on the discussions you suggested - to cement my understanding.


As an aside - I might mention that in the mid 1950's the UK aircraft design industry employed quite a few "loftsmen" who laid out aircraft sections full size on large grey anodised alloy plates using black ink pens with the use of thin wooden splines and lead weights.


Times have certainly changed !


I must commend you on a superb piece of software. I look forward to learning more of it.


Thanks


John