kolibri282
Super Member
Some German seems to have started a collection of pictures of all rotary wing aircraft ever to be sketched on paper, designed or which actually have flown, prototype or production. This is a PDF of the file cards (almost three thousand of them!). Unfortunately you can not zoom the pictures, but the text below the cards is clearly readable. A truly brave attempt.
http://kulturserver-nds.de/home/hubtest/medien/Typenkartei3953xGUN7x9T3Z7.pdf
http://kulturserver-nds.de/home/hubtest/medien/Typenkartei3953xGUN7x9T3Z7.pdf