Welcome To ISRO :: Launch Vehicles :: PSLV

Polar Satellite Launch Vehicle, in its twentieth flight (PSLV-C18) will launch Megha-Tropiques satellite along with three auxiliary payloads with a total payload mass of 1047 kg from the first launch pad of Satish Dhawan Space Centre (SDSC SHAR).

PSLV-C18 is the seventh flight of PSLV in 'core-alone' configuration i.e, without solid strap-on motors.

PSLV- C18 Stages at a Glance
	STAGE-1	STAGE-2	STAGE-3	STAGE-4
Nomenclature	PS1	PS2	PS3	PS4
Propellant	Solid (HTPB Based)	Liquid (UH25 + N₂O₄)	Solid (HTPB Based)	Liquid (MMH + MON-3)
Mass (Tonne)	138.0	41.7	7.6	0.8
Max Thrust (kN)	4800	799	247	7.3 X 2
Burn Time (sec)	100	148	108	163
Stage Dia (m)	2.8	2.8	2.0	2.8
Stage Length (m)	20	12.8	3.6	2.0
Control	Secondary Injection Thrust Vector Control for Pitch & Yaw plane Reaction control Thrusters for Roll Control	Engine Gimbal for Pitch & Yaw plane Hot Gas Reaction Control System (RCS) for Roll Control	Flex Nozzle for Pitch & Yaw plane PS4 RCS for Roll Control	Engine Gimbal for Pitch & Yaw plane RCS for Coast Phase Control

HTPB : Hydroxy Terminated Poly Butadine
UH 25 : Unsymmetrical di-methyl hydrazine & Hydrazine hydrate
MMH : Mono Methyl Hydrazine
MON : Mixed Oxides of Nitrogen