In addition to multi-planetary travel, SpaceX has plans to use the BFR for intercontinental travel. However, would the sound generated by the BFR's launch disrupt local communities and therefore make it unfeasible to set up launchpads across the Earth.

Specifically, how much sound would the two sea level Raptor engines (each with a an approximate thrust of 1,993 kN or about 448,000 lbf) make, and as the sound travels (and loses strength due to the inverse square law) affect nearby communities?

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    $\begingroup$ The '2 sea level Raptor' line indicates you assume they'll only use the BFS (the second stage) for intercontinental travel. But the presentations indicate they plan to use the full stack. $\endgroup$ – Hobbes Nov 18 '18 at 12:36
  • $\begingroup$ The BF rocket would make a BF noise! $\endgroup$ – uhoh Nov 20 '18 at 2:00
  • $\begingroup$ Step 1. Make rocket noises with your mouth. Step 2. It's a lot louder than that. $\endgroup$ – Ingolifs Feb 1 '19 at 4:01
  • $\begingroup$ The version originally announced had 3 sea-level engines for redundancy (the graphics were already obsolete at the time of the presentation). For the version they're working on now, all 7 of the engines are identical and designed to operate from sea level to orbit (to eventually be replaced with more optimized sea level and vacuum versions like in the original plan). In any case, operating as a single-stage hopper, Starship would need all 7 engines at liftoff. (The test hopper they're building now only gets away with 3 because it has smaller tanks and carries no payload.) $\endgroup$ – Christopher James Huff Feb 1 '19 at 23:45

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