Editing Progress (spacecraft) (section)

=== Progress 7K-TG (1978–1990) ===
{{main|Progress 7K-TG}}
[[File:Progress drawing.svg|thumb|upright=1.0|right|Progress logistics resupply spacecraft. It consists of the dry cargo module (left); the tanker compartment (center); and a stretched service module (right).]]

There were 42 spacecraft built using the initial Progress design, the last one being launched in May 1990.

The bureau in charge of designing the freighter was [[Energia (corporation)|TsKBEM]] (now [[Energia (corporation)|RKK Energia]]). They began work on the design in mid-1973, assigning Progress the [[GRAU]] index 11F615A15. The design was complete by February 1974, and the first production model was ready for launch in November 1977. [[Progress 1]] launched on 20 January 1978 aboard the same rocket used to launch the Soyuz. It still featured the same launch shroud as the Soyuz, though this was purely for aerodynamic purposes as the [[launch escape system]] had been deactivated.

This first version of Progress had a mass of {{cvt|7020|kg}} and carried {{cvt|2300|kg}} of cargo, or 30% of its [[launch mass]]. It had the same diameter as the Soyuz at {{cvt|2.2|m}}, but was {{cvt|8|m}} in length – slightly longer. The autonomous flight time was 3 days, the same time as that of the Soyuz ferry. It could spend 30 days docked. Progress always docked to the aft port of the station it was resupplying (the aft being where the main rocket engines of the station and their tankage, for refueling by the Progress, are located).

* Launch mass: {{cvt|7020|-|7249|kg}}
* Mass of cargo:
** ~{{cvt|2300|kg}} (before Progress-24)
** ~{{cvt|2500|kg}} (from Progress-24)
* Length: {{cvt|7.94|m}}
* Diameter of cargo modules: {{cvt|2.2|m}}
* Maximum diameter: {{cvt|2.72|m}}
* Volume of cargo compartment: {{cvt|6.6|m3}}