| 词条 | Mercury-Atlas 2 |
| 释义 |
| name = Mercury-Atlas 2 | image = Mercury-Atlas 2 liftoff.jpg | image_caption = Launch of MA-2 | insignia = Mercury insignia.png | mission_type = Test flight | operator = NASA | mission_duration = 17 minutes, 56 seconds | distance_travelled = {{convert|1432|mi|km|disp=flip}} | suborbital_apogee = {{convert|114|mi|km|disp=flip}} | spacecraft = Mercury No.6 | manufacturer = McDonnell Aircraft | launch_mass = {{convert|1154|kg|lb}} | landing_mass = | launch_date = {{start-date|February 21, 1961, 14:10|timezone=yes}} UTC | launch_rocket = Atlas LV-3B 67-D | launch_site = Cape Canaveral LC-14 | landing_date = {{end-date|February 21, 1961, 14:28|timezone=yes}} UTC | landing_site = | previous_mission = Mercury-Atlas 1 | next_mission = Mercury-Atlas 3 | programme = Project Mercury Mercury-Atlas series }}Mercury-Atlas 2 (MA-2) was launched unmanned on February 21, 1961 at 14:10 UTC, from Launch Complex 14 at Cape Canaveral, Florida.[1] Test objectives for this flight were concerned with the ability of the spacecraft to withstand reentry under the temperature-critical abort conditions and with the capability of the Atlas to meet the proper injection conditions. Convair had promised to deliver thicker-skinned Atlas vehicles for subsequent flights, however Missile 67D was the last of the thin-skinned model and so it had to be modified for the Mercury mission, incorporating a stainless steel reinforcing band installed around the vehicle between stations 502 and 510. A thin sheet of asbestos was installed between the reinforcing band and the tank skin. This modification was installed as a precaution against the type of failure which had occurred on the previous MA-1 flight. The booster's flight path was also modified somewhat from Mercury-Atlas 1, being placed on a more shallow trajectory so as to reduce aerodynamic loads. The Atlas lifted into a clear blue February sky quite different from the cloudy, foggy weather of the MA-1 flight. Everyone in the blockhouse waited nervously for the vehicle to pass through the critical Max Q zone. When it did so successfully, there was "enormous jubilation" from the launch team. MA-2 flew a successful suborbital mission that lasted 17 minutes 56 seconds. Altitude reached was 114 miles (183 km), speed, 13,227 mph (21,287 km/h). All test objectives were fully met, the only problems being a bit of propellant slosh. The capsule was recovered 1,432 miles (2305 km) downrange. Peak acceleration was 15.9 g (156 m/s²). Mass 1,154 kg. Mercury spacecraft #6 and Atlas #67-D were used in the Mercury-Atlas 2 mission. The Mercury capsule is currently displayed at the Houston Museum of Natural Science, Houston, TX.[2] References1. ^{{cite web |url=https://history.nasa.gov/SP-4201/ch10-7.htm |title=This New Ocean: A History of Project Mercury - NASA SP-4201 |authors=Loyd S. Swenson Jr., James M. Grimwood, Charles C. Alexander |publisher=NASA Special Publication-4201 in the NASA History Series |chapter=10 |page=4 |year=1966 |accessdate=26 June 2013 |archiveurl=https://web.archive.org/web/20070823124845/https://history.nasa.gov/SP-4201/ch10-7.htm|archivedate=2007-08-23}} {{Include-NASA}}2. ^{{cite web| url=http://web.mac.com/jimgerard/AFGAS/pages/mercury/MA-2.html| title=Mercury spacecraft #6 display page on A Field Guide to American Spacecraft website| deadurl=yes| archiveurl=https://web.archive.org/web/20100705143917/http://web.mac.com/jimgerard/AFGAS/pages/mercury/MA-2.html| archivedate=2010-07-05| df=}}
See also
3 : Project Mercury|1961 in spaceflight|Spacecraft launched by Atlas rockets |
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