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Progress (spacecraft)
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== Design == The Progress spacecraft shares much of design with the crewed [[Soyuz (spacecraft)|Soyuz spacecraft]] but with several modifications to make it better suited to cargo transport. It consists of three distinct sections:<ref>{{Cite web |title=Progress cargo ship |url=https://www.russianspaceweb.com/progress.html |access-date=2024-11-23 |website=www.russianspaceweb.com}}</ref> * '''Cargo Section''': This pressurized compartment carries supplies for the crew, including maintenance items, prepackaged and fresh food, scientific equipment, and clothing. Its docking drogue, similar to that of the Soyuz, features ducting that enables fuel transfer (described below). * '''Tanker Section''': Replacing the Soyuz’s reentry module, this unpressurized compartment houses two tanks containing [[unsymmetrical dimethylhydrazine]] (UDMH) fuel and [[dinitrogen tetroxide]] ({{Chem2|N2O4}}) oxidizer. Ducts run from these tanks around the outside of the pressurized module to connectors at the docking port, allowing automated fuel transfer. This design prevents any potential leaks of the toxic propellant from contaminating the station's atmosphere. This section also contains water tanks. * '''Propulsion Section''': Located at the rear of the spacecraft, this unpressurized compartment remains largely unchanged from the Soyuz design. It contains the orientation engines used for automatic docking and can be utilized to boost the station's orbit once docked. The Progress spacecraft’s uncrewed and disposable design enables significant weight reduction. Unlike Soyuz, it does not require life support systems, heat shields, parachutes, or automatic crew rescue systems. Additionally, it lacks the ability to separate into multiple modules. After completing its mission, the spacecraft undocks, performs a controlled retrofire, and burns up upon reentry into Earth's atmosphere.
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