BOR-4
SERIES OF SUBSCALE SPACEPLANES USED TO TEST HEAT SHIELD TECHNOLOGIES FOR THE SOVIET SPACE PROGRAM
COSMOS 1374; COSMOS 1445; COSMOS 1517; COSMOS 1614; KOSMOS 1374; KOSMOS 1445; KOSMOS 1517; KOSMOS 1614; Cosmos 1374; Cosmos 1445; Cosmos 1517; Cosmos 1614; Kosmos 1374; Kosmos 1445; Kosmos 1517; Kosmos 1614; COSMOS-1374; COSMOS-1445; COSMOS-1517; COSMOS-1614; KOSMOS-1374; KOSMOS-1445; KOSMOS-1517; KOSMOS-1614; Cosmos-1374; Cosmos-1445; Cosmos-1517; Cosmos-1614; Kosmos-1374; Kosmos-1445; Kosmos-1517; Kosmos-1614
The BOR-4 (БОР-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.