BOR-4
series of subscale spaceplanes used to test heat shield technologies for the Soviet space program
The BOR-4 (БОР-4 Russian: Беспилотный Орбитальный Ракетоплан 4, Bespilotnyi Orbital'nyi Raketoplan 4, "Unpiloted Orbital Rocketplane 4") flight vehicle is a scaled (1:2) prototype of the Soviet Spiral VTHL (vertical takeoff, horizontal landing) spaceplane. An uncrewed, subscale spacecraft, its purpose was to test the heatshield tiles and reinforced carbon-carbon for the Buran space shuttle, then under development.
Several of them were built and flown between 1982 and 1984 from the Kapustin Yar launch site at speeds of up to Mach 25, using K65-RB5 variant of Kosmos-3M launch vehicle. After reentry, they were designed to parachute to an ocean splashdown for recovery by the Soviet Navy. The testing was nearly identical to that carried out by the US Air Force ASSET program in the 1960s, which tested the heatshield design for the X-20 Dyna-Soar. On 16 March 1983 a Royal Australian Air Force P-3 Orion reconnaissance aircraft captured the first Western images of the craft as it was recovered by a Soviet ship near the Cocos Islands.
Flights
Seven BOR were built, and four confirmed flights took place between 1982 and 1984.
“BOR-4” enters the record as series of subscale spaceplanes used to test heat shield technologies for the Soviet space program. Crown Archives preserves that source wording while asking what BOR-4, series and subscale can confirm, complicate or overturn.
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“BOR-4” is worth following because a concise public description often conceals a longer documentary argument. Here, BOR-4, series and subscale provides the most credible route into that argument.
Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated May 8, 2026. The linked authority identifier is Q2877361. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1982, 1984 and 1983.
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This entry incorporates text from “BOR-4” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.