In article , John Keeney
writes
Curious, the "booms" (I note the plural form) were anticipated before
anyone flew Mach 1+?
While I suppose they would be predictable, I'ld be kind of surprised
that anyone had. Was there experience with unmanned missiles or
projectiles to showed it?

I'm not sure exactly about audible booms, but Barnes Wallis apparently
had to spin his big bombs (which apparently went supersonic) after an
early prototype was knocked off course as it went supersonic. There are
some reports from Tirpitz's crew that they heard 'strange noises' as the
Tallboys rained down.

--
John