ablation mode propulsion

AC electric propulsion apparatus

AC MHD propulsion

AC power propulsion system

AC-DC propulsion system

active rudder electric propulsion apparatus

adjustable-pitch screw propulsion

Aerospace propulsion system

aerospace propulsion theory and engineering

air breathing propulsion system

air independent propulsion

aircraft nuclear propulsion

aircraft propulsion reactor

all gas turbine propulsion

atomic propulsion unit

Bowel propulsion

cavity propulsion reactor

Continuous propulsion

cryogenic solid propulsion CSP

descent propulsion system