What decides if a helicopter gets 2/4/6 blades?

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As the title says, why do Hueys have 2 blades, while most others have 4, or the Sea Stallion has 6? And if you put 6 on a 4, does that mean more lift and better performance?

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Anonymous 0 Comments

More blades is more lift but less control. Less blades is more control and less lift.

The non-ELI5 answer is more complicated, but it comes down to the generic engineering problem. How to design something that meets certain requirements. There’s a lot of constraints and factors that go into it and ultimately it’s a design choice.

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