1.8KS7800
1.8KS7800 is a solid propellant rocket engine designed by Aerojet. It is used in the AIM-7A, AIM7B and AIM7C Sparrow missiles and the Aerobee 300-300A sounding rocket. The designation 1.8KS7800 means that the engine burns during 1.8 seconds and generates 7,800 pounds of thrust. References 

Rocket engines