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Helicopter - Wikipedia
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Photos: Tiltrotor helicopter-plane hybrid could fly civilians by 2020
Why did the half-plane, half-helicopter not work? - BBC News
First flight: A Black Hawk helicopter, with no pilots | Popular Science
MV-22 Osprey | Military.com
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A plane that can take off and land like a helicopter! - Rediff.com Business
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The Difference Between Flying an Airplane and A Helicopter | SUU
Why did the half-plane, half-helicopter not work? - BBC News
Vox's New Hybrid Aircraft Can Fly 3 Times Faster Than a Helicopter – Robb Report
V-22 Osprey is an Airplane AND a Helicopter - YouTube
Helicopter vs. Plane: Which is Better for Charter? - Stratos Jet Charters, Inc.
