What is Main Rotor?
The main rotor is the large rotating blade system mounted on top (or sometimes along the fuselage) of a helicopter. It generates lift by pushing air downward and also controls movement (forward, backward, sideways) by changing blade pitch. In simple terms: no main rotor, no flying — it’s the helicopter’s “engine-powered wing.”
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| A main rotor hub |
1. Single Main Rotor
This is the most common design. One large rotor provides lift, and a smaller tail rotor counters torque (the spinning force that would otherwise rotate the body).
Examples:
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UH-60 Black Hawk
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Bell UH-1 Iroquois
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Mil Mi-8
Two large rotors are placed front and rear. They spin in opposite directions, so no tail rotor is needed.
Examples:
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Boeing CH-47 Chinook
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Boeing CH-46 Sea Knight
3. Coaxial Rotor
Two rotors are mounted on the same mast, one above the other, spinning in opposite directions. This cancels torque without a tail rotor.
Examples:
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Kamov Ka-52
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Kamov Ka-27
4. Intermeshing (Synchropter)
Two rotors are mounted at an angle and interlock without hitting each other. They rotate in opposite directions.
Examples:
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Kaman K-MAX
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Kaman HH-43 Huskie
