Water Tunnel Tests of the 4.5" Rocket Projectile with Three Different Fin Tails and One Ring Type Tail

The High Speed Water Tunnel is operated by the California Institute of Technology under Contract OEMsr-207 and is sponsored by Division 6, Section 6.1 of the NDRC. The tests reported in this memorandum were made at the request of Dr. C. N. Hickman of the NDRC. The report covers water tunnel tests of a 2" diameter model of the 4.5" Rocket Projectile with three different collapsible fin tails and one ring type tail. The drag, crosswind force, and the moment acting on the models were measured and the locations of the center-of-pressure were calculated for various yaw angles.