roll - satu
- rubber stop of road wheel arm
- rubber tank
- rubber tyred bogie wheel
- rubberized fabric
- rubberized fabric envelope
- rubberized fabric hose
- rubbery propellant
- rubbing surface
- rubidium vapor magnetometer
- ruby laser
- ruby maser
- ruby optical laser
- ruby rod
- rudder
- rudder buffeting
- rudder deflection
- rudder drive
- rudder hydraulic actuator
- rudder limiter
- rudiments of tank gunnery
