Richard Baldridge wrote: > > Shuttle "entry interface", or the point where it first starts "feeling" the > atmosphere is at 400,000 feet. The Shuttle starts to develope a plasma wake > a bit after entry inferface and to decelerate. > I think that "Entry Interface" aka EI was introduced as crossing of 400 kft level rather arbitrarily for flight plan purposes only in the old days of Apollo as fixed time point for scheduling the activities during re-entry. This height was chosen because any perception of spacecraft interaction with the atmosphere occured well after this time point (eg. for the flight of Apollo 11 the S-band blackout started at EI + 18 seconds, measurable deceleration of 0.05G at EI + 28 seconds). Similarly, the analogical events are occuring for shuttle flight after EI point, not at EI point. -- Mgr. Antonin Vitek, CSc. Office: Main Library, Academy of Sciences of the Czech Republic Narodni 3, CZ-11522 Praha 1, Czech Republic Phone: +420 2 21403255 - Fax: +420 2 24240611 ---------------------------------------------------- Home: Kytin 127, CZ-25210 Mnisek p. B., Czech Republic Phone: +420 305 593865 Coord.: 14.2194 deg E, 49.8488 deg N, 442 m ASL ----------------------------------------------------------------- Unsubscribe from SeeSat-L by sending a message with 'unsubscribe' in the SUBJECT to SeeSat-L-request@lists.satellite.eu.org http://www2.satellite.eu.org/seesat/seesatindex.html
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