BOR-5
The BOR-5 (Russian: БОР-5, «Беспилотный Орбитальный Ракетоплан 5», romanized: Bespilotnyi Orbital'nyi Raketoplan 5, lit. 'Unpiloted Orbital Rocketplane 5') is a 1:8 sized test flight vehicle, used to study the main aerodynamic, thermal, acoustic and stability characteristics of the Buran. It follows upon the BOR-4 reentry test vehicle.