![]() Investigation of Pitot tubes NTRS Full-Text: Author and Affiliation: Herschel, W H Buckingham, E Abstract: Report describes the principles of operation and characteristics of some of the instruments which have been devised or used to measure both low and high speeds of aeroplanes. For models PAFS-1006 to PAFS -1011, up to 10 sensing points and lengths from 12-1/2' to 23-29/32' (31.75 to 60.72 cm) are available to accommodate appropriately sized duct dimensions. ![]() For models PAFS-1002 to PAFS-1005, up to four sensing points and lengths of 3-5/32' to 9-29/32' (8.02 to 25.26 cm) to accommodate box size diameters of 4' to 16' (10.16 to 40. ![]() The difference between these signals is the differential, or velocity pressure. The 'H' port senses total pressure and the 'L' port senses static pressure. Units can also be used to sense differential pressure at other locations in the main or branch duct systems.
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