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How does the size of a prop affect the noise it emits (assuming the pitch stays the same)? I'd like to build an octocopter that's as quiet as possible. I assume that larger props = slower tip speeds = less noise. Are 3 and 4 blade props quieter than 2 blade props?

But is seems like everyone else is. Weird... Anyway, I've been lurking and learning. I have some really grand ideas but they might not be feasible. Guess I'll find out when I start asking questions. My objective is to build a super-stable camera platform that will carry my Canon 5D mark II. I...