Isro's GSLV-F05 launch on Thursday litmus test for cyrogenic engine

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Isro's GSLV-F05 launch on Thursday litmus test for cyrogenic engine


The countdown for the launch of Isro's advanced weather satellite INSAT-3DR on-board GSLV-F05 began on Wednesday at 11.10 am.

"The 29 hr countdown operation of GSLV-F05/INSAT-3DR Mission has started at 11.10 hrs on 7 September," ISRO said.

GSLV is a three-stage launch vehicle

According to a report in The Times of India, GSLV is a three-stage launch vehicle and a cryogenic engine is used in the third or upper stage. INSAT-3DR is an advanced weather satellite which weighs around 2,211 kg.

The cryogenic engines use liquid hydrogen as fuel and liquid oxygen as oxidiser to burn the fuel. It can produce 1.5 times the thrust compared to liquid rocket engines.

Launch to take place from Sriharikota

The rocket will be launched on 8 September at 4.10 pm from the second launchpad at Satish Dhawan Space Centre SHAR (SDSC SHAR), in Sriharikota, PTI reported. The launch was earlier scheduled on 28 August.

Thursday's launch will be the first time an indigenous cryogenic engine will be used on an operational flight.

Operational flight is one when components are not tested

According to a report in The Wire, an "operational flight means Isro will not be testing any components, flight parameters or flight routes. The launch will solely be about the mission: delivering the payload." This launch will be a "litmus test" for India's home-made cryogenic technology.

Speaking to The Times of India, a Isro scientist said, "When we build a new rocket, we do a developmental flight to ascertain if it will work properly. Once we are confident, we call it an operational flight which will be considered a routine launch. GSLV-F05 will place the satellite in the geostationary transfer orbit from where the satellite with its propellant will raise to its final geostationary orbit."

The need to develop indigenous cryogenic engines arose because these engines are necessary to put satellites in geostationary orbit and all Russia-supplied engines were already used. Isro, therefore, had to develop a material which could withstand high temperature and pressure.

Indigenous engine had three development flights

Before declaring Thursday's launch, the indigenous engine had three development flights. Thursday will be the first operational flight.

Earlier with similar configurations, GSLV flight successfully launched D5 and D6 missions in January 2014 and August 2015, putting GSAT-14 and GSAT-6 satellites in the intended GTOs 'very accurately'.

However, reports said that the maiden developmental flight of the indigenous engine conducted on 15 April, 2010 did not succeed.



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