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)[reply]

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)[reply]