Editing Air-augmented rocket (section)

===Advantages===

The effectiveness of this simple method can be dramatic. Typical solid rockets have a [[specific impulse]] of about 260 seconds (2.5 kN·s/kg), but using the same fuel in an air-augmented design can improve this to over 500 seconds (4.9 kN·s/kg), a figure unmatched even by high specific impulse hydrolox engines. This design can even be slightly more efficient than a [[ramjet]], as the exhaust from the rocket engine helps compress the air more than a ramjet normally would; this raises the [[combustion efficiency]] as a longer, more efficient nozzle can be employed. Another advantage is that the rocket works even at zero forward speed, whereas a ramjet requires forward motion to feed air into the engine.