Explanation:

• Indian Space startup, Skyroot Aerospace has successfully test fired a solid propulsion rocket engine, named Kalam-5.
• With this, it has become the first private company of India to successfully design, develop and test a full solid-fueled rocket stage. 
• This crucial propulsion technology will be used for their maiden rocket Vikram-1, which is under active manufacturing and is targeted to be launched in December 2021 with the help of ISRO.
• Kalam is a series of five solid-fueled rocket engines with a thrust ranging from 5kN to 1000kN (approx 100Tons).