A discussion of pitot-static tubes and of their calibration factors with a description if various versions of a new design

Abstract

The report describes experiments devised to investigate some of the previously unexplained peculiarities of normal types of pitot-static tube. Revised basic calibration factors for various instruments are recorded. In the process use was made of a special design of standard static-pressure tube and the experiments led to new alternative types ofpi~ot-static and plain static-pressure instruments. These have nose profiles of modified-ellipsoidal shape. In the report particular attention is given to the implications of the term 'calibration factor', to the special features and limitations of various types of instrument, to the details and precautions of experimental technique for reliable investigations and to the inclusion of generally associated information and comment.