The Polar Satellite has one of the largest solid rocket motors .
The first stage , one of the largest solid rocket boosters in the world , carries 138 tonnes of hydroxyl-terminated polybutadiene urethane-bound ( HTPB ) propellant and develops a maximum thrust of about 4,800 kN . The 2.8-m diameter motor case is made of maraging steel and has an empty mass of 30,200 kg .
Polar Satellite Launch Vehicle