No, it's not. The pointed-to article says that if you travel with the density peak of a sound wave, you get reduced drag, but you'll need some other system (lik

No, it's not. The pointed-to article says that if you travel with the density peak of a sound wave, you get reduced drag, but you'll need some other system (like a railgun / gauss gun) to actually provide propulsion. This article says "I bet it's more than that, I bet the sound waves are actually providing the driving force like in this cool YouTube video of acoustic levitation."