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originally posted by: onehuman
I am obviously no scientist, much less a rocket scientist, but I got to wondering the other day about something so here I am too see if it is just way to far fetched, or a possibility. Since it involves aircraft, I figured this would be the best place to ask.
I got to thinking about sound. How it travels, how it can shatter glass at a certain pitch. How it moves in waves. Then I got to thinking what if...
What if you could design something that focused sound to a point that the waves would crate a thrust, or the sound pushed against something that then in turn created the thrust. I know I am not using very scientific terms here, but hopefully you get the gist of what Im trying to ask. Somehow I see it contained and focused. Not sure what frequency would be needed, but possible perhaps?
Maybe someone with a true scientific mind could ponder that what if a bit. Seems we hear a lot about craft that didnt make a sound. Perhaps the sound is being used on the inside somehow.
originally posted by: Fiberx
a reply to: onehuman
Yes, it could. Sound is an energy wave. It's really not different than a propeller displacing air to produce thrust when you boil it down. It only required a medium to displace (like air). So technically, a speaker produces thrust. The problem is that producing sound as a means of thrust would very inefficient with any means that i know of.
Seems we hear a lot about craft that didnt make a sound. Perhaps the sound is being used on the inside somehow.
originally posted by: OrbitalDecay
The loud home stereo speaker that moves paper out of its path is not doing so with sound waves. The speaker cone moves backwards and forwards at a speed fast enough to displace the area of air directly in front of it, hence moving the paper with a gust of air. On a simpler level just think of a lady fanning herself with a folding paper fan on a hot day and feeling the displaced air on her skin.