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?
In: 490
More blades means using more of the air, which it good for lift and bad for drag. And, of course, more blades costs more.
If you need more lift, to hover over the deck of a ship at sea, then the lift from more blades might be worth it. Everything in engineering is a tradeoff, usually against cost.
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