Photographic Techniques in Jet Propulsion Studies

Motion picture photography has become a standard tool for obtaining permanent records of certain phases of jet engine firings. Types of motion picture cameras generally used are discussed here. They have been classified into five categories based on frame frequency or linear film speed. Representative commercially available cameras are reviewed with regard to frame frequency, motor drive, shutter type, special features, etc. Methods generally used to modify test engines to make them amenable to photographic techniques are described. Systems for correlating events with photographs and comments on interpretation of results are presented briefly. A bibliography is appended for the investigator who desires more extensive details.