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* '''SPEX''' (Scramjet Propulsion Experiment)
===
[[File:AvatarTD.JPG|thumb|Scaled model of RLV-TD. Technology Demonstrator Vehicle on top of HS9 booster.|216x216px]]In January 2012, ISRO announced that a scaled prototype, called '''Reusable Launch Vehicle-Technology Demonstrator''' ('''RLV-TD'''), was approved to be built and tested.<ref name="FinalTouches2015">{{cite news |url=http://idrw.org/indias-futuristic-unmanned-space-shuttle-getting-final-touches/ |title=India’s Futuristic Unmanned Space Shuttle Getting Final Touches |work=EXPRESS NEWS SERVICE |publisher=Indian Defence Research Wing |date=20 May 2015 |accessdate=2015-05-20 }}</ref> The aerodynamics characterization of the RLV-TD prototype was done by [[National Aerospace Laboratories]] in India. 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 entry|atmospheric reentry]].<ref name="FinalTouches2015"/> This prototype weighs around 1.5 tonnes and would fly up to an altitude of 70 km.<ref name="FinalTouches2015"/> ISRO has tentatively slated the prototype's test flight from the first launchpad of [[Satish Dhawan Space Centre]] for December 2015.<ref>http://www.newindianexpress.com/states/kerala/RLV-TD-Mission-to-be-Delayed-At-least-Till-the-Year-End/2015/10/02/article3058357.ece</ref> The RLV-TD will be mounted on top of a solid booster HS9<ref>{{Cite web|url = http://www.sc.iitb.ac.in/~pdsc2014/MVD_talk.pdf|title = Modeling &Control of Launch Vehicles by M. V. Dhekane|date = |accessdate = |website = |publisher = |last = |first = }}</ref> with 1 m diameter and launched beyond the atmosphere, after which the RLV-TD will separate and reenter the atmosphere while traveling through the hypersonic regime.<ref name="Brahmand 2010">{{cite web |url=http://www.brahmand.com/news/Reusable-Launch-Vehicles-%EF%BF%BD-The-future-of-space-missions/5595/3/15.html |title=Reusable Launch Vehicles |work=Brahmand.com |date=November 25, 2010 |accessdate=2014-10-22 }}</ref> The rocket is expendable while the RLV would glide back to Earth and fall in Bay of Bengal as there are no airstrips that are 5 km long at suitable ___location in India that could be used to land such aircraft. ISRO has made detailed reports to construct an airstrip greater than 4 km long in the [[Sriharikota]] island and it will be built in near future.<ref name="Indian Express">{{cite web |url=http://www.newindianexpress.com/states/kerala/ISRO-Gears-up-for-6-Major-Missions-This-Year/2015/05/30/article2839810.ece|title=ISRO Gears up for 6 Major Missions This Year|work=Express News Service |date=30 May 2015}}</ref>
In 2015, it is revealed that, the [[Indian Space Research Organisation]] is in a series of ground tests demonstrated for a stable supersonic combustion for nearly 7 seconds with an inlet Mach number of 6.<ref>{{Cite web|title = Welcome to VIKRAM SARABHAI SPACE CENTRE - ISRO_Supersonic Combustion Tech|url = http://www.vssc.gov.in/VSSC_V4/index.php/2006/79-press-release-articles/631-isro-supersonic-combustion-tech|website = www.vssc.gov.in|accessdate = 2015-12-06}}</ref> A flight test of scram-jet engine is planned in second demonstration flight(ATV-D02) of "Advanced Technology Vehicle"<ref>{{Cite web|title = Successful flight testing of advanced sounding rocket - ISRO|url = http://www.isro.gov.in/update/03-mar-2010/successful-flight-testing-of-advanced-sounding-rocket| website = www.isro.gov.in|accessdate = 2015-12-06}}</ref> that has a diameter of 0.56 m and a length of ~10 m and take off mass of ~3 tonnes<ref>{{Cite web|url = http://www.ias.ac.in/public/Resources/meetings/annmeet/73am_talks/bnsuresh/img12.html| title = "Space Transportation Systems: What the future beholds" by Dr. B N Suresh| date = 2 November 2007| accessdate = |website = |publisher = |last = |first = }}</ref> in 2016.<ref>{{Cite news|title = ISRO set to test scramjet engine|url = http://www.thehindu.com/todays-paper/tp-national/tp-kerala/isro-set-to-test-scramjet-engine/article7926216.ece|newspaper = The Hindu|date = 2015-11-28|access-date = 2015-12-06|issn = 0971-751X|language = en-IN}}</ref>
==See also==
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