INDIA IN SPACE ( PART-2 )

INDIAN SATELLITES AND ROCKETS :
                      WHEN ASLV WAS LAUNCHED FOUR TIMES TWO LAUNCHES WERE SUCCESSFUL.(i.e.DURING  1992 & 1994). BOTH SLV AND ASLV CARRIED ONLY SMALL SATELLITES WITH THEM.ALSO THEY BOTH USED SOLID FUELS.
                        

1ST CRYO ENGINE

                       SOLID FUELS COULD NOT GIVE SUFFICIENT AMOUNT OF POWER TO THE ROCKETS.BUT LIQUID FUELS WOULD PROVIDE MORE POWER THAN SOLID FUELS.LIQUID FUELS ARE OF TWO TYPES.ONE IS AN ORDINARY LIQUID FUEL.ANOTHER ONE IS CRYOGENIC LIQUID FUEL (a liquid that boils at below -160 Degree Celsius  and is used as a refrigerant).

CRYOGENIC ENGINE

                       
                        IT WAS NOT EASY TO MAKE ROCKETS USING CRYOGENIC ENGINES.OUR NATION WAS NOT TECHNOLOGICALLY STRONG IN MAKING CRYOGENIC ENGINES AT THAT TIME. SO INDIA STARTED TO MAKE ROCKETS ( LIKE PSLV ) USING ORDINARY LIQUID FUELS.

                        THIS NEW INDIA'S PSLV ROCKET HAD FOUR STAGES PLACED ONE AFTER ANOTHER.IN THE FIRST STAGE SOLID FUEL WAS USED.IN THE SECOND STAGE LIQUID FUEL WAS USED.THIRD STAGE HAD AGAIN SOLID FUEL.FOURTH STAGE AGAIN HAD LIQUID FUEL.AROUND THE BOTTOM STAGE SIX SMALL ROCKETS WERE FITTED.

                          SLV WEIGHED ONLY 40 TONNES WHEREAS PSLV WEIGHED 295 TONNES.ITS HEIGHT IS 45 METRE.GENERALLY  IN ALL THE ROCKETS, WEIGHT  OF THE FUEL WILL BE MORE. BUT IN PSLV TOTAL  WEIGHT OF THE FUEL IS ONLY 197 TONNE.

                          INDIA SENT SATELLITES CARRIED BY PSLV FOR LAND MANAGEMENT RESEARCH PURPOSES.THE SATELLITES ORBIT AROUND NORTH-SOUTH POLES. THIS IS THE REASON WHY THE ROCKETS CARRYING THESE SATELLITES ARE CALLED AS PSLV ( POLAR SATELLITE LAUNCH VEHICLE ).