This short nonfiction film depicts the intensive testing that goes into developing and producing aircraft propellers. It opens with the whirring or propeller blades. Animated diagrams show how the bite of the propeller moves it through the air and how the pitch determines the size of the bite. A trip through an airplane factory shows the manufacture of a satisfactory alloy. The rest of the process is painstaking hand work interspersed with dozens of careful inspections. The operation of the variable pitch mechanism and its use in taking off and cruising is shown. Then the propeller is assembled the complete job is tested for balance.
Additional credits for production companies taken from BFI website.
DVD copy available.
Direction, Grahame Tharp ; production, Arthur Elton ; photography, Sidney Beadle ; diagrams, Francis Rodker ; location sound, Norman Leevers ; production companies, Shell Film Unit, Petroleum Films Bureau.
Statement of Responsibility
the British Ministry of Information presents.