SOUNDING ROCKETS - SCIENCE AND TECHNOLOGY

SOUNDING ROCKETS - SCIENCE AND TECHNOLOGY

News: ISRO to attempt 200th consecutively successful launch of RH-200 sounding rocket on Wednesday

What's in the news?

●       The Indian Space Research Organisation (ISRO) will attempt the 200th consecutively successful launch of the Rohini RH-200 sounding rocket from Thumba.

●       Former President Ram Nath Kovind will be present at the Vikram Sarabhai Space Centre (VSSC) - ISRO’s lead unit on launch vehicles - to witness the launch.

●       The launch window is between 11 a.m. and 12 noon, a VSSC official said.

About RH-200:

  1. '200' in the name denotes the diameter of the rocket in mm.
  2. Two stage rocket.
  3. Capable of climbing to a height of 70 Km.
  4. For years, the RH-200 rocket had used a polyvinyl chloride (PVC)-based propellant.
  5. The first RH-200 to use a new propellant based on hydroxyl-terminated Polybutadiene (HTPB) was successfully flown from the TERLS in September 2020.
  6. An RH-200 had lifted off successfully from Thumba for the 199th time in a row during the World Space Week celebrations in October this year.

Go Back to Basics:

Sounding Rocket:

●       Sounding rockets are one or two stage solid propellant rockets used for probing the upper atmospheric regions and for space research.

●       They also serve as easily affordable platforms to test or prove prototypes of new components or subsystems intended for use in launch vehicles and satellites.

●       With the establishment of the Thumba Equatorial Rocket Launching Station (TERLS) in 1963 at Thumba, a location close to the magnetic equator, there was a quantum jump in the scope for aeronomy and atmospheric sciences in India.

●       The launch of the first sounding rocket from Thumba near Thiruvananthapuram, Kerala on 21 November 1963, marked the beginning of the Indian Space Programme.

●       Sounding rockets made it possible to probe the atmosphere in situ using rocket-borne instrumentation.

●       The first rockets were two-stage rockets imported from Russia (M-100) and France (Centaure). While the M-100 could carry a payload of 70 kg to an altitude of 85 km, the Centaure was capable of reaching 150 km with a payload of approximately 30 kg. 

●       ISRO started launching indigenously made sounding rockets from 1965 and experience gained was of immense value in the mastering of solid propellant technology.

●       In 1975, all sounding rocket activities were consolidated under the Rohini Sounding Rocket (RSR) Programme. RH-75, with a diameter of 75mm was the first truly Indian sounding rocket, which was followed by RH-100 and RH-125 rockets. 

●       The sounding rocket programme was the bedrock on which the edifice of launch vehicle technology in ISRO could be built. It is possible to conduct coordinated campaigns by simultaneously launching sounding rockets from different locations. It is also possible to launch several sounding rockets in a single day.

●       ISRO has launched more than 1,600 RH-200 rockets so far. The rocket had flown on its 100th consecutively successful mission on July 15, 2015.

●       Along with other Rohini variants like the RH-300 Mk-II and RH-560 Mk-III, this sounding rocket has served as a platform for experiments and new technologies.