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 Amazon.co.uk
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
a high-speed propulsion system which contains no moving parts, unlike a traditional jet engine, and requires no oxidizer (such as liquid oxygen), like a rocket
a simplified (in that it contains fewer moving parts) jet engine where the air does not have to be slowed down or compressed before it is mixed / ignited with the fuel source
a type of jet engine designed by William Avery
A jet engine similar to a turbojet but with no mechanical compressor or turbine. Compression of the incoming air is accomplished entirely by the vehicle's speed through the atmosphere. The vehicle cannot start from rest, but needs to be accellerated to the ramjet's operating speed by other means, such as assisted take-off aboard another aircraft.
An air-breathing jet engine that operates with no major moving parts. It relies on the craft's forward motion to draw in air and on a specially shaped intake passage to compress the air for combustion. Ramjets work best at speeds of Mach 2 (twice the speed of sound) and higher.
air-breathing jet engine similar to a turbojet but without mechanical compressor or turbine; compression is accomplished entirely by ram and is thus sensitive to vehicle forward speed and non-existent at rest.
A jet engine with no mechanical compressor, consisting of specially shaped tubes or ducts open at both ends, the air necessary for combustion being shoved into the duct and compressed by the forward motion of the engine