A rocket vehicle obviously consists of some sort of airframe or casing mounting a rocket engine and providing storage for propellants. Less obviously, it must also carry guidance and control systems. Holiday firework rockets simply have a stick or fins to keep them flying flying straight. Unguided rocket projectiles used by combat aircraft to...
Monopropellant thrusters are much simpler and, in principle, more reliable than a bipropellant system, but they are much less efficient, with a monopropellant hydrazine thruster having a specific impulse less than 70% that of LOX-RP. Whether bipropellant or monopropellant, the thrusters are fed using a pressure or electric pump system, as the high propellant...