Talk:Brennschluss

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To define brennschluss as "[t]he moment in the trajectory of a rocket when the fuel burns out, after which it continues with its own momentum for some distance and then begins to succumb to gravity" suggests three distinct phases of a rocket's flight: (1) thrust-dominated, (2) momentum-dominated, and (3) gravity-dominated. From a physical standpoint, this is incorrect. While thrust is usually applied only during the initial stages, momentum and gravity are relevant throughout a rocket's trajectory. Momentum carries the rocket forward at every instant of its flight. Moreover, a rocket does not "succumb to gravity" (eg, after reaching apogee); from a Newtonian point of view, gravity is constantly changing the rocket's momentum. I suggest defining "brennschluss" as the instant when a rocket transitions from powered to unpowered flight. During the powered phase, a rocket accelerates under its own thrust; subsequently, it follows an essentially ballistic trajectory, possibly modified by aerodynamic forces. 72.235.12.12 (talk) 06:10, 26 November 2011 (UTC) (Joshua E. Barnes, Honolulu, Hawaii)

german ortography

after the ortographic reform of 1998 Brenschluß is no longer the correct spelling. However, the word has probably been borrowed by the English language prior to that — Preceding unsigned comment added by 141.30.204.155 (talk) 21:07, 24 May 2013 (UTC)