helicopter
preferred label: بالگرد @fa
type: Concept
narrower: helicopter rotor

tandem rotor helicopter
preferred label: بالگرد دوپشته @fa
type: Concept
related: helicopter rotor

helicopter rotor
related: tandem rotor helicopter
related: compound helicopter
broader: helicopter
broader: rotor
preferred label: چرخانه بالگرد @fa
type: Concept

compound helicopter
preferred label: بالگرد مرکب @fa
type: Concept
related: helicopter rotor

rotor
preferred label: چرخانه @fa
type: Concept
narrower: helicopter rotor