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The URM-2 rocket module for the Angara family

The second stage of the Angara launch vehicle is known as URM-2, which stands for Universal (or common) Rocket Module No. 2.

Previous chapter: URM-1 rocket stage

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Cutaway view of the URM-2 rocket stage configured for the first launch of the Angara rocket. Copyright © 2014 Anatoly Zak

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Angara owes its unusual appearance to the URM-2 upper stage whose diameter of 3.6 meters makes it wider than the 2.9-meter first-stage booster below it. Like the first stage, the URM-2 uses liquid oxygen oxidizer and kerosene fuel. However, on the URM-2, the kerosene tank is installed in the upper position, with the liquid oxygen tank below it. The stage is powered by the four-chamber RD-0124A engine, adapted from the third stage of the Soyuz-2 rocket.

There was also an alternative proposal to use a pair of one-chamber RD-0125A engines with a total thrust of 59 tons on URM-2. The new engine would lower the cost of the stage and increase its payload, but it had never been developed.

All electric connections, fueling and thermal conditioning of the URM-2 stage on the launch pad is accomplished via quick-disconnect umbilicals, BRS, of the stationary service tower.

According to the original plans, the URM-2 stage was supposed to be used on both types of the Angara launch vehicles approved for development -- the Angara-1 and the Angara-5. Ultimately, the decision was made to develop a custom-built stage for the Angara-1 and use the URM-2 on the Angara-5 only. (The Angara-3, if ever built, could also use URM-2.) Still, during the first inaugural launch of the new rocket family, the URM-2 stage would fly as the second stage of the first Angara-1 rocket. It was not intended to reach orbit, but was programmed to fire its RD-0124A engine, testing flight performance of the entire stage. As a result, by the time the Angara-5 rocket is ready to fly, the flight-tested URM-2 would be ready to serve as the third stage.

URM-2

Propulsion system and oxidizer tank of the URM-2 stage.

Known specifications of the URM-2 module:

Specifcation
URM-2
Diameter
3.6 meters
Length
6.9 meters
Propulsion system
Fuel
Kerosene
Oxidizer
Luquid oxygen

 

URM-2 mass specifications:

Liftoff mass
*39,746 kilograms
Propellant mass
35,222 kilograms
Dry mass
*4,800 kilograms

*includes the 100-kilogram lower transfer ring.


 

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Page author: Anatoly Zak; Last update: October 9, 2016

Page editor: Alain Chabot; Last edit: June 16, 2014

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URM2

A prototype of Angara's upper stage known as the A5A2S article No. A13 is being towed to a test stand at the Remmash facility at the NITs RKP test center in Peresvet for endurance tests in cryogenic environment in the fall of 2012. Credit: GKNPTs Khrunichev


urm2

Tanks for the URM-2 booster during production in Omsk. Credit: PO Polyot


URM-2

Assembly

Assembly of the URM-2 rocket module for the Angara-5 rocket. Its fuel tank can be seen on the background on the left. Credit: GKNPTs Khrunichev


URM-2

A prototype of the URM-2 module for the Angara-1.2PP rocket in Plesetsk in July 2012. Credit: Zvezda TV channel


1pp

Final processing of the URM-2 booster for the Angara-1.2PP rocket in Plesetsk. Credit: Rossiya TV channel

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