Nozzle of one of the altitude control engines on a Soyuz cap - Lot 148

Lot 148
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Estimation :
800 - 1200 EUR
Nozzle of one of the altitude control engines on a Soyuz cap - Lot 148
Nozzle of one of the altitude control engines on a Soyuz capsule (7K-OK - 11F615 - 1st Generation) Origin: ENERGIA (Moscow) URMD micromotors designed to pitch and yaw the capsule during atmospheric re-entry, with a thrust of 7.5 kgf. Hydrogen peroxide thrusters used on one of the Soyuz 7K-OK spacecraft (1966-1971). Good condition D. (with base) 12 x 11.5 x 20 cm (Chisel marks on surface) The orientation of the Descent Compartment (DC - capsule) during re-entry into the atmosphere enables it to follow a semi-ballistic trajectory. Compared with a ballistic trajectory, this reduces the load factor to which the crew is subjected, and significantly improves landing accuracy. This orientation is provided by the Descent Actuator System, or SIOS (Система Исполнителных Органов Спуска), which is controlled by the Descent Control System (SUD). The center of gravity of the SA is eccentric. So, to control orientation during the atmospheric phase of descent, the SUD uses the SIOS to act on the roll angle (Source: Kosmonavtika). These thruster nozzles were one of the key components of the attitude and altitude control engine. This thruster isn't quite complete, but the nozzle shows the rainbow effects on the metal that attest to numerous test firings. There's no way of confirming or denying that this nozzle was ever flown in space, but we can say that it was tested on several occasions. In general, each part bears engraved identification numbers. Here, given the context, the identification numbers have been ground off by the Russians. The nozzle is mounted on a wooden stand in the shape of a Soyuz (SA) capsule silhouette, with a descriptive plaque on the base.
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