HELICOPTER
none. Wingless aircraft obtaining lift and propulsion from horizontally revolving overhead blades. [greek: related to *helix, pteron wing]
none. Wingless aircraft obtaining lift and propulsion from horizontally revolving overhead blades. [greek: related to *helix, pteron wing]
none. Wingless aircraft obtaining lift and propulsion from horizontally revolving overhead blades. [greek: related to *helix, pteron wing]
none. Wingless aircraft obtaining lift and propulsion from horizontally revolving overhead blades. [greek: related to *helix, pteron wing]