Click on the following link which takes you to a PDF of Report No. 620 by the Ballistics Research Labarotories on the Aerodynamics of Spinning Projectiles; while it is very technical there are many good drawings of US projectiles in use or being tested in 1947. The link is:http://www.dtic.mil/cgi-bin/GetTRDoc?AD=AD0800469
It may take a short while to down load.
Brian
It may take a short while to down load.
Brian