Avatar (spacecraft)

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AVATAR RLV
Ntaf221208.jpg
A scaled down version of AVATAR undergoing aero-elastic test.
Function Manned reusable spaceplane
Manufacturer DRDO/ISRO
Country of origin  India
Size
Stages 1/2
Capacity
Launch history
Status Testing prototypes[1]
Launch sites Satish Dhawan Space Centre
Total launches 0
First flight 2025 (proposed)[2]

AVATAR (Sanskrit: अवतार) (from "Aerobic Vehicle for Transatmospheric Hypersonic Aerospace TrAnspoRtation") is a concept for a manned 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 is for low cost military and commercial satellite space launches, as well as for space tourism.[3][4][5]

In January 2012, it was announced that a scaled prototype, called 'Reusable Launch Vehicle-Technology Demonstrator' (RLV-TD), was approved to be built and tested.[1] The first scaled-down flight test is planned for July 2015,[1][2] and the first manned AVATAR flight is proposed for 2025.[2]

Concept[edit]

The idea is to develop a spaceplane vehicle that can takeoff from conventional airfields. Its liquid air cycle engine would 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, a reusable launch vehicle (RLV) was first announced in May 1998 at the Aero India 98 exhibition held at Bangalore.[citation needed]

AVATAR is projected to weigh 25 tons, of which 60% of that mass would be liquid hydrogen fuel.[4] The oxygen required by the vehicle for combustion in outer space would be collected from the atmosphere during takeoff, thus reducing the need to carry oxygen during launch.[4] The notional specification is for a payload weighing up to 1,000 kg to low Earth orbit and to withstand up to 100 launches and reentries.[3][4]

AVATAR RLV-TSTO

If built, AVATAR would takeoff horizontally like a conventional airplane from a conventional airstrip using turbo-ramjet engines that burn hydrogen and atmospheric oxygen.[4] Once at a cruising altitude, the vehicle would use scramjet propulsion to accelerate from Mach 4 to Mach 8.[2] During this cruising phase, an on-board system would collect air from the atmosphere, from which liquid oxygen would be separated and stored.[4] The liquid oxygen collected would then be used to burn the stored hydrogen in the final flight phase to attain orbit. The vehicle would be designed to permit at least one hundred launches and atmospheric reentries.[4]

In Hinduism, an avatar (/ˈævəˌtɑr, ˌævəˈtɑr/;[6] Hindustani: [əʋˈt̪aːr] from Sanskrit अवतार avatāra "descent") is a deliberate descent of a deity to Earth, or a descent of the Supreme Being (e.g., Vishnu for Vaishnavites).

Development[edit]

A model of the RLV-TD on the top of a launcher

AVATAR is being developed by India's Defence Research and Development Organization.[3] Air Commodore Raghavan Gopalaswami, who is heading the project, made a presentation on the spaceplane at the global conference on propulsion at Salt Lake City, USA on July 10, 2001.[3][4] Gopalaswami said the idea for AVATAR originated from the work published by the RAND Corporation of the United States in 1987.[4]

In January 2012, ISRO announced that a scaled prototype, called Reusable Launch Vehicle-Technology Demonstrator (RLV-TD), was approved to be built and tested.[1] ISRO indicates that the manned AVATAR spaceplane may fly approximately in 2025.[2]

Scaled-down tests[edit]

The aerodynamics characterization of the RLV-TD prototype was done by National Aerospace Laboratories in India. The unmanned scaled-down prototype has a diameter of 0.56 m and a length of 10 m.[2] The RLV-TD is in the last stages of construction by a Hyderabad-based private company called CIM Technologies.

By May 2015, engineers at the Vikram Sarabhai Space Centre (VSSC) in Thumba Equatorial Rocket Launching Station were installing thermal tiles on the outer surface of the 'RLV-TD', so it can withstand the intense heat during atmospheric reentry.[1] This prototype weighs around 1.5 tonnes and would fly up to an altitude of 70 km.[1] ISRO has tentatively slated the prototype's test flight from the first launchpad of Satish Dhawan Space Centre for July 2015.[2][1] The RLV-TD will be mounted on top of a rocket and launched beyond the atmosphere, after which the RLV-TD will separate and reenter the atmosphere while traveling through the hypersonic regime.[7] The rocket is expendable while the RLV would glide back to Earth and land like a normal aeroplane.

See also[edit]

Aircraft of comparable role, configuration and era

References[edit]

  1. ^ a b c d e f g "India’s Futuristic Unmanned Space Shuttle Getting Final Touches". EXPRESS NEWS SERVICE (Indian Defence Research Wing). 20 May 2015. Retrieved 2015-05-20. 
  2. ^ a b c d e f g "Wednesday, August 03, 2011India's Space Shuttle [Reusable Launch Vehicle (RLV)] program". AA Me, IN. 2011. Retrieved 2014-10-22. 
  3. ^ a b c d "Indian Scientists unveils space plane Avatar in US". Gujarat Science City. 10 July 2001. Retrieved 2014-10-22. 
  4. ^ a b c d e f g h i "India Eyes New Spaceplane Concept". Space Daily (New Delhi). August 8, 2001. Retrieved 2014-10-22. 
  5. ^ "AVATAR- Hyper Plane to be built by INDIA". India's Military and Civilian Technological Advancements. December 19, 2011. 
  6. ^ "avatar". Random House Webster's Unabridged Dictionary.
  7. ^ "Reusable Launch Vehicles". Brahmand.com. November 25, 2010. Retrieved 2014-10-22. 

External links[edit]