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April 12 is the 60th anniversary of the first human spaceflight, Vostok 1. As no human had previously been to space, it was also a test of the SK-1 spacesuit that cosmonaut Yuri Gagarin wore.

This question asks about how early spacesuits were tested; the answer explains that they were laboratory tested in a vacuum chamber. Was the SK-1 actually tested in an aircraft or spacecraft prior to Gagarin's flight?

This is the first of 6 questions honoring the 60th anniversary of Vostok 1, the first human spaceflight.

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Прототипом первого космического скафандра СК-1 был высотный костюм «Воркута», разработанный для летчиков истребителя-перехватчика Су-9.

Важнейшей отличительной чертой стал шлем, который при падении давления автоматически захлопывал забрало. Для этого в шлем был встроен специальный датчик.

The prototype of the first space suit SK-1 was the Vorkuta high-altitude suit, developed for the pilots of the Su-9 fighter-interceptor.

The most important distinguishing feature was the helmet, which automatically slammed the visor when the pressure dropped. For this, a special sensor was built into the helmet.

https://www.ng.ru/science/2018-07-12/100_skafandr120718.html

P.S. @horsh This poster probably shows the Vorkuta helmet or a close analogue. enter image description here

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    $\begingroup$ A picture of Vorkuta suit russianarms.ru/forum/… $\endgroup$
    – user54
    Apr 12, 2021 at 1:16
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    $\begingroup$ @horsh it is interesting that on the first posters Gagarin was portrayed in a different helmet than in reality. $\endgroup$
    – A. Rumlin
    Apr 12, 2021 at 3:14

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