Angara (rocket family)
The Angara rocket family
|Country of origin||Russia|
|Height||42.7 m (140 ft)-64 m (210 ft)|
|Width||Angara A1.2 2.9 m (9 ft 6 in)
Angara A5 8.86 m (29.1 ft)
|Mass||171,500 kg (378,100 lb)-790,000 kg (1,740,000 lb)|
|3,800 kg (8,400 lb)-24,500 kg (54,000 lb)|
|5,400 kg (11,900 lb)-7,500 kg (16,500 lb)|
|Comparable||Naro-1 used a modified URM-1 first stage|
|Launch sites||Plesetsk Site 35
|Total launches||1 (A1.2PP: 1)|
|Successes||1 (A1.2PP: 1)|
|First flight||A1.2PP: July 9, 2014|
|Boosters (A5) - URM-1|
|No boosters||4 (see text)|
|Thrust||1,920 kN (430,000 lbf) (Sea level)|
|Total thrust||7,680 kN (1,730,000 lbf) (Sea level)|
|Specific impulse||310.7 s (3.047 km/s) (Sea level)|
|Burn time||214 seconds|
|First Stage - URM-1|
|Thrust||1,920 kN (430,000 lbf) (Sea level)|
|Specific impulse||310.7 s (3.047 km/s) (Sea level)|
|Burn time||Angara 1.2: 214 seconds
Angara A5: 325 seconds
|Second Stage - URM-2|
|Thrust||294.3 kN (66,200 lbf)|
|Specific impulse||359 s (3.52 km/s)|
|Burn time||Angara A5: 424 seconds|
|Third Stage (Optional, Angara A5) - Briz-M|
|Thrust||19.6 kN (4,400 lbf)|
|Specific impulse||326 s (3.20 km/s)|
|Burn time||3,000 seconds|
|Third Stage (Optional, Angara A5) - KVTK, under development|
|Thrust||68.6 kN (15,400 lbf)|
|Specific impulse||463 s (4.54 km/s)|
|Burn time||1,350 seconds|
The Angara rocket family is a family of space-launch vehicles being developed by the Moscow-based Khrunichev State Research and Production Space Center. The rockets are to put between 3,800 and 24,500 kg into low Earth orbit and are intended, along with Soyuz-2 variants, to replace several existing launch vehicles.
- 1 History
- 2 Vehicle description
- 3 Variants
- 4 Specifications
- 5 Testing and manufacturing
- 6 Launches
- 7 Related projects
- 8 Comparable rockets
- 9 See also
- 10 References
- 11 External links
After the dissolution of the Soviet Union, many formerly Soviet launch vehicles were built in or required components from companies now located in Ukraine, such as Yuzhnoye Design Bureau, which produced Zenit-2, and Yuzhmash, which produced Dnepr and Tsyklon. Additionally, the Soviet Union's main spaceport, Baikonur Cosmodrome, was located in Kazakhstan, and Russia encountered difficulties negotiating for its use. This led to the decision in 1992 to develop a new entirely Russian launch vehicle, named Angara, to replace the rockets now built outside of the country, and ensure Russian access to space without Baikonur. It was decided that this vehicle should ideally use the partially completed Zenit-2 launch pad at the Russian Plesetsk spaceport, and be able to launch military satellites into geosynchronous orbit, which Proton could not due to lack of a launch pad at Plesetsk Cosmodrome. Several companies submitted bids for the new rocket, and in 1994 Khrunichev, the developer of Proton, was selected as the winner. The commercial success of Proton over the next two decades would be an advantage to Khrunichev, as the Angara project immediately ran into funding difficulties from the cash-strapped Russian government.
Khrunichev's initial design called for the use of a modified-RD-170 for first stage propulsion and a liquid hydrogen powered second stage. By 1997, the hydrogen-powered second stage had been abandoned in favor of kerosene, and the RD-170 was replaced with a modular design which would be powered by the new RD-191, a one-chamber engine derived from the four-chamber RD-170. In late 1997 Khrunichev was given approval from the Russian government to proceed with their new design, which would both be able to replace the ICBM-based Dnepr, Tsyklon, and Rokot with its smaller variants, as well as be able to launch satellites into geostationary orbit from Plesetsk with the Proton-class Angara A5. This new modular rocket would require construction of a new launch pad.
By 2004, the design of Angara had taken shape and the project proceeded with development of the launchers. In 2008, NPO Energomash, the builder of the RD-191, reported that the engine had completed development and burn tests and was ready for manufacturing and delivery, and in January of 2009 the first completed Angara first stage was delivered to Khrunichev. The next year Vladimir Nesterov, Director-General of Khrunichev, announced that the first flight test of Angara would be scheduled for 2013, and 2013 the first prototype Angara rocket arrived in Plesetsk.
URM-1: first stage and boosters
The Universal Rocket Module (URM-1) forms the core of every Angara vehicle. In the Angara A5, four additional URM-1s act as boosters. Each URM-1 is powered by a single NPO Energomash RD-191 burning liquid oxygen and RP-1 (kerosene).
The RD-191 is a single-chamber engine derived from the four-chamber RD-170, originally developed for the boosters powering the Energia launch vehicle. Zenit's four-chamber RD-171 and the dual-chamber RD-180 powering ULA's Atlas V are also derivatives of the RD-170, as is the RD-193 proposed as a replacement for the 1970s-era NK-33 powering the first stage of the Soyuz 2-1v. The RD-191 is capable of throttling down to at least 30%, allowing core URM-1 stages to conserve propellant until booster URM-1 separation.
The URM-1 consists of a liquid oxygen tank at the top, followed by an intertank structure containing flight control and telemetry equipment, with the kerosene tank below that. At the base of the module is a propulsion bay containing engine gimballing equipment for vehicle pitch and yaw and thrusters for roll control.
URM-2: second stage
The second stage of the Angara, designated URM-2, uses one KB Khimavtomatika RD-0124A engine also burning liquid oxygen and kerosene. The RD-0124A is nearly identical to the RD-0124 currently powering the second stage of Soyuz-2, designated Block I. This stage has a diameter of 3.6 meters for the Angara A5 and other proposed variants. The Angara 1.2 will fly a smaller RD-0124A-powered URM-2, which may be 2.66 meters to maintain commonality with Block I or stretched to 2.9 meters to maintain a consistent diameter with URM-1.
Angara 1.2 will not use a third stage, nor will Angara A5 when delivering payloads to low orbits. For higher energy orbits such as GTO, Angara A5 will use the Briz-M upper stage (currently used for the Proton-M rocket), powered by one S5.98M burning N2O4 and UDMH, or eventually a new cryogenic upper stage, the KVTK. This stage will use the LH2/LOX powered RD-0146D and allow Angara A5 to bring up to two tonnes more mass to GTO.
The smallest Angara under development is the Angara 1.2, which consists of one URM-1 core and a modified Block I second stage. It has a lift-off mass of 171 tonnes and can deliver 3.8 tonnes of payload to a 200 km x 60° orbit.
A modified Angara 1.2, called Angara 1.2pp (Angara-1.2 pervyy polyot, meaning Angara-1.2 first flight), made Angara's inaugural suborbital flight on July 9, 2014. This flight lasted 22 minutes and carried a mass simulator weighing 1,430 kilograms (3,150 lb). Angara 1.2PP weighed 171,000 kilograms (377,000 lb) and consisted of a URM-1 core stage and a partially fueled 3.6-metre (12 ft)-diameter URM-2, allowing each of the major components of Angara A5 to be flight tested before that version's first orbital launch, expected later in 2014.
The second Angara expected to be developed is the Angara A5, which will use one URM-1 core and four URM-1 boosters, the enlarged 3.6m URM-2 second stage, and an upper stage, either the Briz-M or the KVTK Weighing 773 tonnes at lift-off, Angara A5 will have a payload capacity of 24.5 tonnes to a 200 km x 60° orbit. Angara A5 will be able to deliver 5.4 tonnes to GTO with Briz-M, or 7.5 tonnes to the same orbit with KVTK.
In the Angara A5, the four URM-1s used as boosters operate at full thrust for approximately 214 seconds, then separate. The URM-1 forming the vehicle's core is operated at full thrust for lift off, then throttled down to 30% to conserve propellant. The core is throttled back up after the boosters have separated and continues burning for another 110 seconds.
Initial plans called for an even smaller Angara 1.1 using a Briz-KM as a second stage, with a payload capacity of 2 tonnes. This version was cancelled as it fell into the same payload class as the Soyuz 2-1v, which made its debut flight in 2013.
The Angara A3 would consist of one URM-1 core, two URM-1 boosters, the 3.6m URM-2, and an optional Briz-M or hydrogen powered upper stage for high energy orbits. The hydrogen powered stage for this vehicle, called RCAF would be smaller than the Angara A5's KVTK. This vehicle has no current plans for use since its payload class (14.6 tonnes to 200 km x 60°, 2.4 tonnes to GTO with Briz-M or 3.6 tonnes with a hydrogen upper stage) is mostly covered by the Soyuz-2, but could be developed as a replacement for Zenit.
Khrunichev has proposed an Angara A5 capable of launching a new crewed spacecraft weighing up to 18 tonnes: the Angara 5P. This version would have 4 URM-1s as boosters surrounding a sustainer core URM-1 but lack a second stage, relying on the spacecraft to complete orbital insertion from a slightly suborbital trajectory, much like the Space Shuttle or Buran. This has the advantage of allowing all engines to be lit and checked out while on the ground, eliminating the possibility of an engine failing to start after staging. The RD-191 engines may also be operated at reduced thrust to improve safety.
Proposals exist for a super-heavy Angara A7, weighing 1133 tonnes and capable of putting 35 tonnes into a 200 km x 60° orbit, or delivering 12.5 tonnes to GTO with an enlarged KVTK-A7 as a second stage in place of the URM-2. There are no current plans to develop this vehicle as it would require a larger core URM-1 to carry more propellant and would have to await the development of the hydrogen powered engine for KVTK. The Angara A7 would also require a different launch pad.
A new launch-vehicle proposed by Khrunichev in 2005 was designated Angara-100, denoting its ability to deliver a 100-ton payload into the low Earth orbit. Such capability would place the booster in the same class with US Saturn-V and the Soviet N1 "moon rockets" from the 1960s, as well as more recent Energia. If ever built, the Angara-100 would be a "high-end" addition to the Angara family of rockets, which has been under development since the early 1990s. The proposed rocket would have a larger RD-180 powered first stage, along with four URM-1 strap on boosters.
Together with NPO Molniya, Khrunichev has also proposed a reusable URM-1 booster named Baikal. The URM-1 would be fitted with a wing, an empennage, a landing gear, a return flight engine and attitude control thrusters, to enable the rocket to return to an airfield after completing its mission.
|Version||Angara 1.2||Angara A5|
|Second stage||Modified Block I||URM-2|
|Third stage (not used for LEO)||–||Briz-M/KVTK|
|Thrust (at sea level)||1.92 MN||9.61 MN|
|Launch weight||171.5 t||759 t|
|Height (maximal)||41.5 m||55.4 m|
|Payload (LEO 200 km)||3.8 t||24.5 t|
|Payload (GTO)||–||5.4/7.5 t|
|Payload (GEO)||–||3/4.6 t|
Cancelled or proposed
|Second stage||Briz-KM||Modified Block I||–||KVTK-A7|
|Third stage (not used for LEO)||–||Briz-M/RCAF||–||–|
|Thrust (at sea level)||1.92 MN||5.77 MN||9.61 MN||13.44 MN|
|Launch weight||149 t||481 t||713 t||1133 t|
|Height (maximal)||34.9 m||45.8 m||?||?|
|Payload (LEO 200 km)||2.0 t||14.6 t||18.0 t||35 t|
|Payload (GTO)||–||2.4/3.6 t||–||12.5 t|
|Payload (GEO)||–||1.0/2.0 t||–||7.6 t|
Testing and manufacturing
The production of the Universal Rocket Modules and the Briz-M upper stages will take place at the Khrunichev subsidiary Production Corporation Polyot in Omsk. In 2009, Polyot invested over 771.4 million RUB (about $25 million) in Angara production lines. Design and testing of the RD-191 engine was done by NPO Energomash, while its mass production will take place at the company Proton-PM in Perm.
Angara will primarily be launched from the Plesetsk Cosmodrome. Beginning in 2021, plans call for it to also be launched from the Vostochny Cosmodrome under construction in Eastern Russia. This would allow the phase out of Proton, a rocket whose operation at Baikonur Cosmodrome Kazakhstan has objected to, due to its use of large amounts of highly toxic UDMH and N2O4 and reliability issues.
List of launches
|Date/Time (UTC)||Configuration||Serial number||Launch pad||Outcome|
|July 9, 2014
|Angara 1.2PP||Plesetsk Cosmodrome Area 35 Start 1||Successful|
|1,430 kg (3,150 lb), mass simulator||suborbital|
|Non-standard Angara 1.2PP allowed flight testing of both URM-1 and URM-2|
The South Korean launch vehicle Naro-1 used a first stage derived from Angara's URM-1 (fitted with a lower-thrust version of the RD-191 engine called RD-151). The vehicle made its first flight on August 25, 2009. The flight was not successful, but the first stage operated as expected. A second launch on June 10, 2010 ended in failure, when contact with the rocket was lost 136 seconds after launch. The Joint Failure Review Board failed to come to a consensus on the cause of the failure. The third flight on January 30, 2013 successfully reached orbit.
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