blade flapping (the vertical movement in its plane of rotation because of differences in lift between the advancing and retreating blades)

plane of rotation / tip path plane

tip path plane / plane of rotation

intended for direct fire support of advancing infantry and main battle tanks

direction of blade rotation

advancing the attack

abrasive wear of compressor blades

compressor blades damage

turbine blades breakdown

advancing fire

lift-off / lift off

plane-to-plane communication

flapping hinge

flapping stop

flapping

flapping angle

vertical-lift aircraft

vertical plunger priming fuel lift pump

common vertical lift support platform

vertical datum plane

vertical plane

blade flat; saber flat; sword flat, flat of the blade / sword

blade de-icers / blade heating elements

blade heating elements / blade de-icers

blade horn / blade lever

blade tip light / main-rotor blade tip light

main-rotor blade tip light blade tip light

clearance between barrel and forearm

List of Operational Contact Points between Vulcanological Agencies, Meteorological Watch Offices and Air Control Center

correlation between the object linear dimensions and wavelength

AUKUS (ˈɔːkəs) (security partnership between Australia, UK and US)

instantaneous vertical speed indicator / instantaneous vertical-speed indicator (IVSI)

rearming and refueling aircraft rotation