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Why do some helicopters have horizontal stabilizers and others not like the early Sikorsky R4s? What is there for a horizontal surface in the tail? - Quora
Anatomy of a Helicopter: The Blade Are Spinning and the Engine Is Running - How Helicopters Work | HowStuffWorks
For a coaxial rotorcraft, do horizontal and vertical stabilizers in the tail really make much of a difference? - Quora
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Parts of a Helicopter | Learn Helicopter Parts | Helicopter |Basic Parts of a Helicopter -Kids Entry - YouTube
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Development and Testing of a Low-Cost Integrated RTM Horizontal Stabilizer - Vertical Flight Library & Store
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