Do two blade helicopters make more noise than 5 blade helicopters?
Question by want it bad: Do two blade helicopters make more noise than 5 blade helicopters?
I saw a UH-60 land on a school field and it didn't seem to make much noise. I didn't hear it descend, the next thing I know people have their cell phone cameras out and are staring. I remember hearing UH-1N's from miles away as well as those little jet rangers the cops and the tv stations use. Anyone know why? 1-4 word answers will be given low ratings.
Answer by oldhombre
Generally yes, 2 blade helicopters "throb" more than 4 or 5 bladed choppers. The prop noise comes most from how the shock waves of the prob blades interact with other static and moving parts. We have a strange helicopter around here which they use to fight fires with. It has 2 contrarotating props on top and no tail rotor. You can hear its throb for miles. The chinook too has a particular throb signature and the front and rear blades interact.
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Tags: blade, blade helicopters, cell phone cameras, do two blade helicopters make more noise than 5 blade helicopters, HELICOPTERS, more, noise, particular throb signature, rear blades, than
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