This paper describes "two-dimensional" tests in a water
tunnel of a profile identical to the 4412 airfoil section of the National Advisory Committee for Aeronautics. The tests included photographic observations of the inception and growth of cavitation as influenced by velocity, pressure (submergence) and angle of attack,
and measurements, during cavitation-free operation, of the hydrodynamic forces and moments as functions of Reynolds number and angle of attack. The relation between the angle of attack and the value of the cavitation parameter at which inception occurs is shown for
each face of the hydrofoil. The effect of profile geometry in causing cavitation, and the significance of distinct~y different types of cavitation obtained with change in variables are discussed. Convenient curves are given showing the submergence required to avoid
cavitation for different velocities and angles of attack. The measured hydrodynamic characteristics are presented in graphical form and are also compared with previously existing data from wind tunnel tests of a finite aspect ratio span. The experimental procedure
and its reliability in indicating true infinite aspect ratio
characteristics is discussed
