Originally Posted by
PDR1
It's the first edition of the same book. The original edition is called "aerodynamic drag", and the subsequent editions were called "fluid-dynamic drag".
(
wiki refers)
PDR
Very interesting PD. I see that the author was treated to an extended American working holiday under Operation Paperclip, presumably in 1946, when he wrote your book which he self published in 1951. Then the other one comes out fifteen years later.
I wonder if material was removed between the volumes on the grounds of military secrecy. A comparison of your book, which must be pretty valuable, to the available Fluid Dynamics could be intriguing.