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Kitty Hawk reveals its secret project, Heaviside

(techcrunch.com)
171 points BrooklynRage | 1 comments | 03 Oct 19 17:59 UTC | HN request time: 0.203s | source
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mortenjorck ◴[06 Oct 19 00:17 UTC] No.21168894[source]▶
When they led with “100x quieter than a helicopter,” my first reaction was a skeptical “well sure, decibels are logarithmic!” But 40dB from 600ft away is impressive, and within the range of what I would consider acceptable for residential flyover (though not takeoff and landing) in a medium-density area.
replies(3): >>21169030 #>>21169633 #>>21169799 #
1. mannykannot ◴[06 Oct 19 03:24 UTC] No.21169633[source]▶
40dB at 600ft is impressive, especially if it is carrying a payload equal to that of a passenger, and is maintaining altitude. That 100x quote, however, has a whiff of an intent to deceive people who are not familiar with the technicalities of loudness measurement.