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View Full Version : True Airspeed Indicator History


Vinnie Boombatz
10th May 2019, 13:38
https://cimg4.ibsrv.net/gimg/pprune.org-vbulletin/1280x1780/kollsman_ad_flying_magazine_oct_1944_bab48acf0262e3b027990b6 012126faee3c6f77e.jpg
https://cimg8.ibsrv.net/gimg/pprune.org-vbulletin/2000x1399/machmeter_aviation_week_1944_09_01_0064_6c1c1a7e54e3d7bfc6cb e1229ab58564f5dbcca7.jpg
Sometime during WW II, the first accurate true airspeed indicators were fielded. A lengthy web search has failed to find a definitive date, inventor, model, or manufacturer. The rich text file attachment provides a roughly chronological outline, with links to sources.

The intent of the thread is to try to fill in gaps in that chronology. Another goal is to fill in examples of use in military aircraft in WW II. Flight manuals found on-line for the B-17 (http://aafcollection.info/items/detail.php?key=464&pkg=bc!category!40!464!1!title!up!20) and B-29 (http://aafcollection.info/items/detail.php?key=467&pkg=bc!category!40!467!1!title!up!20) do not mention a TAS indicator.

The attached Kollsman ad appeared in the October 1944 issues of Flying and Aviation magazines.

The other attached figure is a two page article in the September 1944 issue of Aviation on a mach meter. The Kollsman name appears on the instrument dial at the lower left, but is not mentioned in the text, nor is an author listed.