Page "R-7 Semyorka" Paragraph 8
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The first testing of the new missile, codenamed 8K71, was on 15 May 1957 from Baikonur Cosmodrome.
A fire in a strap-on rocket led to an unintended crash 400 km from the site.
Following another unsuccessful test the first successful long flight, of 6, 000 km, was made on 21 August.
It was announced by TASS on 26 August.
A modified version of the missile ( 8K71PS ) placed Sputnik 1 in orbit from Baikonur on 4 October and Sputnik 2 on 3 November.
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