|This article is outdated. (February 2011)|
A scaled down version of AVATAR undergoing aero-elastic test.
|Function||Unmanned reusable spaceplane technology demonstrator|
|Country of origin||India|
|Status||Under Development|
|Launch sites||Satish Dhawan Space Centre|
AVATAR (Sanskrit: अवतार) (from "Aerobic Vehicle for Hypersonic Aerospace TrAnspoRtation") was a concept development effort for a single-stage reusable spaceplane capable of horizontal takeoff and landing, by India's Defence Research and Development Organization along with Indian Space Research Organization and other research institutions. The mission concept was for cheaper military and civilian satellite space launches.
The idea was to develop a hyperplane vehicle that can take off from conventional airfields, collect air in the atmosphere on the way up, liquefy it, separate oxygen and store it on board for subsequent flight beyond the atmosphere. The AVATAR RLV was first announced in May 1998 at the Aero India 98 exhibition held at Bangalore.
AVATAR is proposed to weigh only 25 tonnes in which 60 per cent of mass will be liquid hydrogen fuel. The oxygen required by the vehicle for combustion is collected from the atmosphere, thus reducing the need to carry oxygen during launch.
When operational, it is planned to be capable of delivering a payload weighing up to 1,000 kg to low earth orbit. It would be the cheapest way to deliver material to space at about US$67/kg. Each craft is expected to withstand 100 launches.
If built, AVATAR would take off horizontally like a conventional airplane from a conventional airstrip using turbo-ramjet engines that burn air and hydrogen. Once at a cruising altitude, the vehicle would use scramjet propulsion to accelerate from Mach 4 to Mach 8. During this cruising phase, an on-board system would collect air from the atmosphere, from which liquid oxygen would be separated and stored. The liquid oxygen collected then would be used in the final flight phase when the rocket engine burns the collected liquid oxygen and the carried hydrogen to attain orbit. The vehicle would be designed to permit at least a hundred re-entries into the atmosphere.
M. R. Suresh, a senior ISRO official, stated[when?] that, "The dream of making a vehicle which can take off from a runway like an aircraft, and to return to the runway after deploying the spacecraft in the desired orbit (or Single-stage-to-orbit or SSTO) can be fulfilled only by the availability of more advanced high strength but low density materials so that the structural mass of the vehicle could be reduced considerably from the present levels. The advent of nano-technology could play a deciding factor in developing such exotic materials. However, the material technology available today can realize a Two Stage To Orbit (TSTO) vehicle only and the configuration of the vehicle which is being considered. However, before realizing the RLV-TSTO, it is important to perfect many critical technologies pertaining to hypersonic reentry vehicles. Hence a technology demonstrator vehicle (RLV-TD) is being developed."[full citation needed]
AVATAR is being developed by India's Defence Research and Development Organization. Air Commodore Raghavan Gopalaswami, former chief of Bharat Dynamics Ltd, Hyderabad, was heading the project, as of 2001[update]. He coined the name and made the presentation on the space plane at the global conference on propulsion at Salt Lake City (USA) on July 10, 2001. Gopalaswami said the idea for AVATAR originated from the work published by the RAND Corporation of the United States in 1987.
Currently DRDO plans to build and fly a scaled-down version of AVATAR, weighing just 3 tonnes at takeoff. The project is headed by Vikram Sarabhai Space Centre in Thiruvananthapuram. The mini AVATAR is to be built by a Hyderabad-based private company called CIM Technologies, project completion data is still not finalized. The prototype will be launched using the PSLV and will demonstrate all technologies used in AVATAR including oxygen collection.
- Aircraft of comparable role, configuration and era