In Bückeburg, Lower Saxony on June 23, 2021, a rich, thumping sound rang above the helicopter museum near the moated castle. The characteristic outline of the "carpet beater," as the Bell UH-1D is often called in the Bundeswehr, appeared in the sky. The two rotors with the powerful engine, to which this nickname is owed, "beat" at 324 revolutions per minute. As the aircraf...