{"id":602,"date":"2016-07-19T16:14:22","date_gmt":"2016-07-19T23:14:22","guid":{"rendered":"http:\/\/tghaviation.com\/aircraft-instrument-services\/?p=602"},"modified":"2025-06-25T11:04:30","modified_gmt":"2025-06-25T18:04:30","slug":"pitot-static-system-airspeed-calculation","status":"publish","type":"post","link":"https:\/\/tghaviation.com\/aircraft-instrument-services\/pitot-static-system-airspeed-calculation\/","title":{"rendered":"Pitot Static System&#8230;Airspeed Calculation"},"content":{"rendered":"<p>Pitot Static System Airspeed Calculation<\/p>\n<p>A. \u00a0Airspeed Calculation:<\/p>\n<p>Airspeed is calculated as a function of the difference between Pitot Pressure and Static Pressure as follows:<\/p>\n<p>Calculated or Indicated airspeed is indicated airspeed corrected for instrument errors, position error (due to incorrect pressure at the static port) and installation errors.<\/p>\n<p>Calibrated airspeed values less than the speed of sound at standard sea level (661.4788 knots) are calculated as follows:<\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"http:\/\/tghaviation.com\/aircraft-instrument-services\/wp-content\/uploads\/pitot-picture.jpeg.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-598\" src=\"http:\/\/tghaviation.com\/aircraft-instrument-services\/wp-content\/uploads\/pitot-picture.jpeg-300x85.jpg\" alt=\"pitot picture.jpeg\" width=\"300\" height=\"85\" srcset=\"https:\/\/tghaviation.com\/aircraft-instrument-services\/wp-content\/uploads\/pitot-picture.jpeg-300x85.jpg 300w, https:\/\/tghaviation.com\/aircraft-instrument-services\/wp-content\/uploads\/pitot-picture.jpeg.jpg 736w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a>minus position and installation error correction.<\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"text-decoration: underline;\">Where<\/span><\/p>\n<p><a href=\"http:\/\/tghaviation.com\/aircraft-instrument-services\/wp-content\/uploads\/qc.jpg\"><br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-622\" src=\"http:\/\/tghaviation.com\/aircraft-instrument-services\/wp-content\/uploads\/Vc.jpg\" alt=\"Vc\" width=\"33\" height=\"22\" \/><\/a>\u00a0is the calibrated airspeed,<\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-621\" src=\"http:\/\/tghaviation.com\/aircraft-instrument-services\/wp-content\/uploads\/qc.jpg\" alt=\"qc\" width=\"36\" height=\"23\" \/>is the impact pressure (inches Hg) sensed by the pitot tube,<\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-619\" src=\"http:\/\/tghaviation.com\/aircraft-instrument-services\/wp-content\/uploads\/P0.jpg\" alt=\"P0\" width=\"38\" height=\"24\" \/>is 29.92126 inches Hg; static air pressure at standard sea level,<\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"http:\/\/tghaviation.com\/aircraft-instrument-services\/wp-content\/uploads\/a0.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-617\" src=\"http:\/\/tghaviation.com\/aircraft-instrument-services\/wp-content\/uploads\/a0.jpg\" alt=\"a0\" width=\"42\" height=\"23\" \/><\/a>is 661.4788 knots:, speed of sound at standard sea level<\/p>\n<p>&nbsp;<\/p>\n<p>Units other than knots and inches of mercury can be used, if used consistently.<\/p>\n<p>This expression is based on the form of Bernoulli\u2019s equation applicable to a perfect, incompressible gas. The values for<img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-619\" src=\"http:\/\/tghaviation.com\/aircraft-instrument-services\/wp-content\/uploads\/P0.jpg\" alt=\"P0\" width=\"46\" height=\"29\" \/>and \u00a0\u00a0<a href=\"http:\/\/tghaviation.com\/aircraft-instrument-services\/wp-content\/uploads\/A0_small.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-618\" src=\"http:\/\/tghaviation.com\/aircraft-instrument-services\/wp-content\/uploads\/A0_small.jpg\" alt=\"A0_small\" width=\"41\" height=\"33\" \/><\/a>are consistent with the ISA i.e. the conditions under which airspeed indicators are calibrated.<\/p>\n<p>Keep in mind that this is for your basic <strong>vanilla airspeed indicator<\/strong> and does not include calculations for <strong>TRUE<\/strong> Airspeed for which you must include the variables of True Temperature and True Altitude.<\/p>\n<p>&nbsp;<\/p>\n<p><em><strong>Stay tuned for upcoming Blogs<\/strong><\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Pitot Static System Airspeed Calculation A. \u00a0Airspeed Calculation: Airspeed is calculated as a function of the difference between Pitot Pressure and Static Pressure as follows: Calculated or Indicated airspeed is indicated airspeed corrected for instrument errors, position error (due to incorrect pressure at the static port) and installation errors. Calibrated airspeed values less than the &hellip; <a href=\"https:\/\/tghaviation.com\/aircraft-instrument-services\/pitot-static-system-airspeed-calculation\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Pitot Static System&#8230;Airspeed Calculation<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[9],"tags":[14,62,12,44,119,122,111,112,13,20,117,109,114,120,115,116,108,110,118,121,113],"class_list":["post-602","post","type-post","status-publish","format-standard","hentry","category-tgh-aviation-blog","tag-aircraft","tag-airspeed","tag-altimeter","tag-altitude","tag-cabin-pressurization","tag-instrument-flight","tag-machmeter","tag-multiple-pressure","tag-pilot","tag-pitot-static","tag-pitot-static-check","tag-pitot-tube","tag-position-errors","tag-pressure-diaphragm","tag-ram-air-pressure","tag-stagnation-pressure","tag-static-port","tag-static-system","tag-transponder-check","tag-variometer","tag-vertical-speed-indicator"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/tghaviation.com\/aircraft-instrument-services\/wp-json\/wp\/v2\/posts\/602","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tghaviation.com\/aircraft-instrument-services\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tghaviation.com\/aircraft-instrument-services\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tghaviation.com\/aircraft-instrument-services\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/tghaviation.com\/aircraft-instrument-services\/wp-json\/wp\/v2\/comments?post=602"}],"version-history":[{"count":23,"href":"https:\/\/tghaviation.com\/aircraft-instrument-services\/wp-json\/wp\/v2\/posts\/602\/revisions"}],"predecessor-version":[{"id":1923,"href":"https:\/\/tghaviation.com\/aircraft-instrument-services\/wp-json\/wp\/v2\/posts\/602\/revisions\/1923"}],"wp:attachment":[{"href":"https:\/\/tghaviation.com\/aircraft-instrument-services\/wp-json\/wp\/v2\/media?parent=602"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tghaviation.com\/aircraft-instrument-services\/wp-json\/wp\/v2\/categories?post=602"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tghaviation.com\/aircraft-instrument-services\/wp-json\/wp\/v2\/tags?post=602"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}