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2.5.2 Salyut 4 Notable Features

 * Structural layout very similar to that of Salyut 1. That is, it had a single docking port leading into a transfer compartment, a work compartment divided into smalldiameter and large-diameter sections, and a propulsion and service module based on the Soyuz service module (figure 2-8). It was the last of four DOS-type stations based on hulls from the Almaz program.
 * Stroka teleprinter allowed the TsUP to send hardcopy instructions to the Salyut 4 cosmonauts.
 * Raketa (“rocket”) vacuum cleaner in transfer compartment.
 * Rubberized fabric sleeve in the transfer compartment for providing ventilation to docked Soyuz Ferries.
 * Cosmonauts spent a great deal of time conducting astrophysics observations. The large-diameter work compartment was dominated by a conical structure housing, among other things, the OST-1 25-cm solar telescope. It was equipped with a spectrograph and a diffraction spectrometer. The cosmonauts could recoat the mirror by remote control using the Zentis system. The solar telescope lacked a solar events alarm (as had Skylab) to alert the cosmonauts to valuable observation opportunities. The conical housing also held the Filin and RT-4 X-ray telescopes and the ITSK infrared telescope.
 * Cosmonauts also spent a great deal of time on experiments with application to closed-cycle life support systems. They cultivated peas and onions in the Oazis plant growth unit. They again tested a water regeneration system, which condensed about a liter of water from the station’s air each day.
 * width="66.6%" align="left" valign="top" rowspan="1" colspan="2"| Salyut 4 and Soyuz drawing.svg Figure 2-8. Salyut 4, the second DOS station to be manned.
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 * The Priboy water regeneration system was first tested on Salyut 3.
 * The Priboy water regeneration system was first tested on Salyut 3.


 * Meteoroid measurement system with 4 m2 of detectors built into the hull.
 * Solar arrays larger than the Soyuz-based arrays on Salyut 1/DOS-1. Salyut 4 had three steerable arrays with a combined surface area greater than the four nonsteerable arrays on Salyut 1.
 * Exercise equipment included a treadmill (flown on previous stations) and a bicycle ergometer (flown for the first time on Salyut 4). The bicycle ergometer generated electricity which was stored for use by the station.
 * Used Delta orientation/navigation system; also tested the Kaskad orientation/navigation system.
 * For observing Earth, carried the KATE-140 and KATE-500 multispectral cameras, Spektru upper atmosphere analyzer, and other instruments.
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