"a) Wing times" should be "a) Wing tips"
The Stinson drawing I mentioned was by Wylam, published by Air Age (who were
the publishers of Model Airplane News (may still be). The paper they used was
not much better that newsprint quality, certainly not as good as the paper
used by Ray Rimmel for the Albatros datafiles. I still have those old Wylam
books and they are now very brittle with age.
My comment about lenses only applies to those photo copiers that use a lense.
I have not seen one but I understand that some might use a scanning type
process.
Paul Butler
pgb@kau1.kodak.com