Definitions for "Ramjet"
A type of jet engine with very few moving parts which consists of a specially shaped tube open at both ends in which air is compressed purley from the forward speed. The addition of fuel and this being then ignited increases the volume of air. Note that ramjets only operate above certain speeds. Search for ramjet books on
A jet (air-breathing) engine that has no moving parts. Instead the air is compressed in the engine by the current speed of the aircraft. This means that the engine has a relatively narrow operating range, the craft must be supersonic to gain a high enough compression, with the upper limit being between Mach 4 and 5
a simple type of jet engine; must be launched at high speed
Ramjet is the name of several fictional characters in the various Transformers universes.