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• Mercury-Atlas_1 abstract "Mercury-Atlas 1 (MA-1) was the first launch attempt of a Mercury capsule (not including the boilerplate spacecraft of the September 1959 Big Joe flight) launched at 13:13 UTC on July 29, 1960 from Cape Canaveral, Florida. The Mercury spacecraft was unmanned and carried no launch escape system. The mission was to conduct a suborbital test flight and reentry of the spacecraft. The capsule had live posigrade separation rockets, but dummy retro rockets. The Atlas rocket suffered a structural failure 58 seconds after launch. The vehicle at that time was at approximately an altitude of 30,000 feet (9.1 km) and 11,000 feet (3.4 km) down range when it was passing through Max Q and all telemetry signals suddenly ceased. Because the day was rainy and overcast with thick clouds, the booster had been out of sight from T+15 seconds and it was impossible to see what happened. A number of Mercury engineers had voiced their objection to launching on July 29 because of the weather precluding visual coverage of the flight. Some observers claim to have heard an explosion, but this could not be verified. The capsule continued transmitting until it impacted the ocean. Subsequent salvage attempts dredged it and the Atlas's booster engines and LOX vent valve from the ocean floor.Telemetry indicated that the Atlas functioned normally until about T+57 seconds and there was no sign of any problems up to that point, when a severe axial disturbance was detected. Approximately one second later, the pressure difference between the Atlas's propellant tanks dropped to zero, followed by loss of engine thrust and telemetry and the appearance of multiple objects on radar. Capsule data indicated violent movements following loss of booster telemetry, but the Mercury otherwise continued functioning normally until impact with the ocean at around 220 seconds after launch. The parachute system did not deploy because of the nature of the abort.NASA's Owen Maynard, who was involved in Mercury systems engineering, led the recovery of the MA-1 capsule from the sea-floor (in which he performed a 30-foot free-dive to find one particular missing component of the capsule). He stated in an official interview that his post-flight calculations showed the skin of the launch vehicle just below the spacecraft would have buckled, due to the combined drag and bending loads at the max-Q point exceeding the tensile stress in the skin due to internal pressure. Based on that finding, the NASA specified that future Mercury-Atlas launch vehicles add doublers to the skin structure in that area, and that future launch trajectories be shallowed to reduce pitch angle rate, to reduce the bending stress on the launch vehicle. This failure mode did not recur on those subsequent launches.The capsule reached an apogee of 13 km and flew 9.6 km downrange. The flight lasted 3 minutes and 18 seconds. Capsule weight 1,154 kg. Serial numbers: Atlas 50-D, Mercury spacecraft #4.Pieces of Mercury spacecraft #4, used in the Mercury-Atlas 1 mission, are currently displayed at the Kansas Cosmosphere and Space Center, Hutchinson, Kansas.".
• Mercury-Atlas_1 thumbnail MA-1_Capsule_Reassembled_After_Explosion_-_GPN-2002-000043.jpg?width=300.
• Mercury-Atlas_1 wikiPageExternalLink sc-query.html.
• Mercury-Atlas_1 wikiPageExternalLink cover.htm.
• Mercury-Atlas_1 wikiPageExternalLink OEM_4-21-99.pdf.
• Mercury-Atlas_1 wikiPageID "728340".
• Mercury-Atlas_1 wikiPageRevisionID "580866788".
• Mercury-Atlas_1 hasPhotoCollection Mercury-Atlas_1.
• Mercury-Atlas_1 imageCaption "The reconstructed MA-1 spacecraft after debris recovery".
• Mercury-Atlas_1 insignia "Mercury insignia.png".
• Mercury-Atlas_1 launchDate "--07-29".
• Mercury-Atlas_1 launchRocket Atlas_LV-3B.
• Mercury-Atlas_1 launchSite Cape_Canaveral_Air_Force_Station.
• Mercury-Atlas_1 launchSite Cape_Canaveral_Air_Force_Station_Launch_Complex_14.
• Mercury-Atlas_1 manufacturer McDonnell_Aircraft.
• Mercury-Atlas_1 missionDuration "198.0".
• Mercury-Atlas_1 missionDuration "Launch failure".
• Mercury-Atlas_1 missionType "Test flight".
• Mercury-Atlas_1 name "Mercury-Atlas 1".
• Mercury-Atlas_1 nextMission Mercury-Atlas_2.
• Mercury-Atlas_1 operator NASA.
• Mercury-Atlas_1 previousMission Big_Joe_1.
• Mercury-Atlas_1 programme Project_Mercury.
• Mercury-Atlas_1 programme "(Mercury-Atlas series)".
• Mercury-Atlas_1 spacecraft "Mercury No.4".
• Mercury-Atlas_1 subject Category:1960_in_spaceflight.
• Mercury-Atlas_1 subject Category:1960_in_the_United_States.
• Mercury-Atlas_1 subject Category:Project_Mercury.
• Mercury-Atlas_1 type ArtificialSatellite.
• Mercury-Atlas_1 type Satellite.
• Mercury-Atlas_1 type Event.
• Mercury-Atlas_1 type SpaceMission.
• Mercury-Atlas_1 type Thing.
• Mercury-Atlas_1 comment "Mercury-Atlas 1 (MA-1) was the first launch attempt of a Mercury capsule (not including the boilerplate spacecraft of the September 1959 Big Joe flight) launched at 13:13 UTC on July 29, 1960 from Cape Canaveral, Florida. The Mercury spacecraft was unmanned and carried no launch escape system. The mission was to conduct a suborbital test flight and reentry of the spacecraft. The capsule had live posigrade separation rockets, but dummy retro rockets.".
• Mercury-Atlas_1 label "Mercury-Atlas 1".
• Mercury-Atlas_1 label "Mercury-Atlas 1".
• Mercury-Atlas_1 label "Mercury-Atlas 1".
• Mercury-Atlas_1 label "Mercury-Atlas 1".
• Mercury-Atlas_1 label "Меркурий-Атлас-1".
• Mercury-Atlas_1 sameAs Mercury-Atlas_1.
• Mercury-Atlas_1 sameAs Mercury-Atlas_1.
• Mercury-Atlas_1 sameAs Mercury-Atlas_1.
• Mercury-Atlas_1 sameAs Mercury-Atlas_1.
• Mercury-Atlas_1 sameAs m.036623.
• Mercury-Atlas_1 sameAs Q645695.
• Mercury-Atlas_1 sameAs Q645695.
• Mercury-Atlas_1 wasDerivedFrom Mercury-Atlas_1?oldid=580866788.
• Mercury-Atlas_1 depiction MA-1_Capsule_Reassembled_After_Explosion_-_GPN-2002-000043.jpg.
• Mercury-Atlas_1 isPrimaryTopicOf Mercury-Atlas_1.