Ram-jet propulsion and Turbojet propulsion

Turbojet propulsion and ram-jet propulsion are semantically related in propulsion by jet discharge topic. In some cases you can use "Turbojet propulsion" instead a noun phrase "Ram-jet propulsion".

Ram-jet propulsion and turbojet propulsion are semantically related in propulsion by jet discharge topic. You can use "Ram-jet propulsion" instead a noun phrase "Turbojet propulsion".