Splashdown

Splashdown is the method of landing a spacecraft by parachute in a body of water. It was used by crewed American space capsules prior to the Space Shuttle program, by SpaceX Dragon and Dragon 2 capsules and by NASA's Orion Multipurpose Crew Vehicle. It is also possible for the Russian Soyuz spacecraft to land in water, though this is only a contingency. The only example of an unintentional crewed splashdown in Soviet history is the Soyuz 23 landing.

For other uses, see Splashdown (disambiguation).

Apollo 15 makes contact with the Pacific Ocean.
Locations of Atlantic Ocean splashdowns of American spacecraft prior to the 21st century
Locations of Pacific Ocean splashdowns of American spacecraft

As the name suggests, the capsule parachutes into an ocean or other large body of water. The properties of water cushion the spacecraft enough that there is no need for a braking rocket to slow the final descent as is the case with Russian and Chinese crewed space capsules (while Shenzhou designed a raft and balanced capsule in case of splashdown), which return to Earth over land. The American practice came in part because American launch sites are on the coastline and launch primarily over water.[1] Russian launch sites are far inland and most early launch aborts were likely to descend on land.

Missions
Apollo 14 returns to Earth, 1971.

The splashdown method of landing was used for Mercury, Gemini and Apollo (including Skylab, which used Apollo capsules). Soyuz 23 unintentionally landed on a freezing lake with slushy patches of ice during a snowstorm.[2][3]

On early Mercury flights, a helicopter attached a cable to the capsule, lifted it from the water and delivered it to a nearby ship. This was changed after the sinking of Liberty Bell 7. All later Mercury, Gemini and Apollo capsules had a flotation collar (similar to a rubber life raft) attached to the spacecraft to increase their buoyancy. The spacecraft would then be brought alongside a ship and lifted onto deck by crane.

After the flotation collar is attached, a hatch on the spacecraft is usually opened. At that time, some astronauts decide to be hoisted aboard a helicopter for a ride to the recovery ship and some decided to stay with the spacecraft and be lifted aboard ship via crane. All Gemini and Apollo flights (Apollos 7 to 17) used the former, while Mercury missions from Mercury 6 to Mercury 9, as well as all Skylab missions and Apollo-Soyuz used the latter, especially the Skylab flights as to preserve all medical data. During the Gemini and Apollo programs, NASA used MV Retriever for the astronauts to practice water egress.

Apollo 11 was America's first Moon landing mission and marked the first time that humans walked on the surface of another planetary body. The possibility of the astronauts bringing "Moon germs" back to Earth was remote, but not impossible. To contain any possible contaminants at the scene of the splashdown, the astronauts donned special Biological Isolation Garments and the outside of the suits were scrubbed prior to the astronauts being hoisted aboard USS Hornet and escorted safely inside a Mobile Quarantine Facility.[4]

Both the SpaceX Dragon and Dragon 2 capsules were designed to use the splashdown method of landing. The original cargo Dragon splashed down in the Pacific Ocean off the coast of Baja California. At the request of NASA, both the crew and cargo variations of the Dragon 2 capsule splashes down off the coast of Florida, either in the Atlantic Ocean or the Gulf of Mexico.[5][6]

The early design concept for the new U.S. Orion Crew Exploration Vehicle featured recovery on land using a combination of parachutes and airbags, although it was also designed to make a contingency splashdown (only for an in-flight abort) if needed. Due to weight considerations, the airbag design concept was dropped. The present design concept features landings via splashdown in the Pacific Ocean off the coast of California.[7]

Disadvantages

The most dangerous aspect is the possibility of the spacecraft flooding and sinking. For example, when the hatch of Gus Grissom's Liberty Bell 7 capsule blew prematurely, the capsule sank and Grissom almost drowned.

Since the spacecraft's flooding will occur from a location in its hull where it ruptures first, it is important to determine the location on the hull that experiences the highest loading.[8] This location along the impacting side is determined by the surrounding `air cushion' layer, which deforms the water surface before the moment of impact, and results in a non-trivial geometry of the liquid surface during first touch-down.[9][10][11]

If the capsule comes down far from any recovery forces, the crew are exposed to greater danger. As an example, Scott Carpenter in Aurora 7 overshot the assigned landing zone by 400 kilometers (250 mi). These recovery operation mishaps can be mitigated by placing several vessels on standby in several different locations, but this is quite an expensive option.

Locations

Crewed spacecraft
# Spacecraft Agency Landing date Coordinates Recovery ship Miss distance (km) Reference
1 Freedom 7 NASA May 5, 1961 27°13.7′N 75°53′W USS Lake Champlain 5.6 km (3.5 mi) [12]
2 Liberty Bell 7 NASA July 21, 1961 27°32′N 75°44′W USS Randolph 9.3 km (5.8 mi) [13]
3 Friendship 7 NASA February 20, 1962 21°26′N 68°41′W USS Noa
(USS Randolph**)		 74 [14]
4 Aurora 7 NASA May 24, 1962 19°27′N 63°59′W USS John R. Pierce
(USS Intrepid**)		 400 [15]
5 Sigma 7 NASA October 3, 1962 32°06′N 174°28′W USS Kearsarge 7.4 [16]
6 Faith 7 NASA May 16, 1963 27°20′N 176°26′W USS Kearsarge 8.1 [17]
7 Gemini 3 NASA March 23, 1965 22°26′N 70°51′W USS Intrepid 111 [18]
8 Gemini 4 NASA June 7, 1965 27°44′N 74°11′W USS Wasp 81 [19]
9 Gemini 5 NASA August 29, 1965 29°44′N 69°45′W USS Lake Champlain 270 [20]
10 Gemini 7 NASA December 18, 1965 25°25′N 70°07′W USS Wasp 12 [21]
11 Gemini 6A NASA December 16, 1965 23°35′N 67°50′W USS Wasp 13 [22]
12 Gemini 8 NASA March 17, 1966 25°14′N 136°0′E USS Leonard F. Mason
(USS Boxer**)		 2 [23]
13 Gemini 9A NASA June 6, 1966 27°52′N 75°0′W USS Wasp 0.7 [24]
14 Gemini 10 NASA July 21, 1966 26°45′N 71°57′W USS Guadalcanal 6 [25]
15 Gemini 11 NASA September 15, 1966 24°15′N 70°0′W USS Guam 5 [26]
16 Gemini 12 NASA November 15, 1966 24°35′N 69°57′W USS Wasp 5 [27]
17 Apollo 7 NASA October 22, 1968 27°32′N 64°04′W USS Essex 3 [28]
18 Apollo 8 NASA December 27, 1968 8°7.5′N 165°1.2′W USS Yorktown 2 [29]
19 Apollo 9 NASA March 13, 1969 23°15′N 67°56′W USS Guadalcanal 5 [30][31]
20 Apollo 10 NASA May 26, 1969 15°2′S 164°39′W USS Princeton 2.4 [32][33]
21 Apollo 11 NASA July 24, 1969 13°19′N 169°9′W USS Hornet 3.13 [34][35]
22 Apollo 12 NASA November 24, 1969 15°47′S 165°9′W USS Hornet 3.7 [36][37]
23 Apollo 13 NASA April 17, 1970 21°38′S 165°22′W USS Iwo Jima 1.85 [38][39]
24 Apollo 14 NASA February 9, 1971 27°1′S 172°39′W USS New Orleans 1.1 [40][41]
25 Apollo 15 NASA August 7, 1971 26°7′N 158°8′W USS Okinawa 1.85 [42][43]
26 Apollo 16 NASA April 27, 1972 0°43′S 156°13′W USS Ticonderoga 0.55 [44][45]
27 Apollo 17 NASA December 19, 1972 17°53′S 166°7′W USS Ticonderoga 1.85 [46][47]
28 Skylab 2 NASA June 22, 1973 24°45′N 127°2′W USS Ticonderoga [48]
29 Skylab 3 NASA September 25, 1973 30°47′N 120°29′W USS New Orleans [49]
30 Skylab 4 NASA February 8, 1974 31°18′N 119°48′W USS New Orleans [49]
31 Apollo CSM-111 NASA July 24, 1975 22°N 163°W USS New Orleans 1.3 [50][51]
32 Soyuz 23 USSR October 16, 1976 Lake Tengiz Mi-8 helicopter [52]
33 Crew Dragon Demo-2 SpaceX August 2, 2020 29°48′N 87°30′W GO Navigator [53]
33 Crew Dragon Crew-1 SpaceX May 2, 2021 29°32′N 86°11′W GO Navigator [54]
34 Inspiration4 SpaceX September 18, 2021 GO Searcher [55]
35 Crew Dragon Crew-2 SpaceX November 7, 2021 GO Navigator
35 Axiom Mission 1 SpaceX April 25, 2022 Megan
36 Crew Dragon Crew-3 SpaceX May 6, 2022 Shannon [56]
37 Crew Dragon Crew-4 SpaceX October 14, 2022 Megan
38 Crew Dragon Crew-5 SpaceX March 11, 2023 Shannon
39 Axiom Mission 2 SpaceX May 31, 2023 Megan

Uncrewed spacecraft
Spacecraft Agency Landing date Coordinates Recovery ship Miss distance
Jupiter AM-18
(Able and Baker)		 USAF May 28, 1959 48 to 96 km (30 to 60 mi) N Antigua Island USS Kiowa 16 km (9.9 mi)[57]
Mercury-Big Joe NASA September 9, 1959 2,407 km (1,496 mi) SE Cape Canaveral USS Strong 925 km (575 mi)[58]
Mercury-Little Joe 2

Sam The Rhesus Monkey

 NASA December 4, 1959 319 km (198 mi) SE Wallops Island, Virginia USS Borie  ? km[59]
Mercury-Redstone 1A NASA December 19, 1960 378.2 km (235.0 mi) SE Cape Canaveral USS Valley Forge 12.9 km (8.0 mi)[60]
Mercury-Redstone 2 NASA January 31, 1961 675.9 km (420.0 mi) SE Cape Canaveral USS Donner[61] 209.2 km (130.0 mi)[62]
Mercury-Atlas 2 NASA February 21, 1961 2,293.3 km (1,425.0 mi) SE Cape Canaveral USS Donner[61] 20.9 km (13.0 mi)[63]
Discoverer 25
(Corona 9017)		 USAF June 16, 1961 mid-air recovery missed
Mercury-Atlas 4 NASA September 13, 1961 257.5 km (160.0 mi) E of Bermuda USS Decatur 64.4 km (40.0 mi)[64]
Mercury-Atlas 5 NASA November 29, 1961 804.7 km (500.0 mi) SE of Bermuda USS Stormes  ? km[65]
Gemini 2 NASA January 19, 1965 16°33.9′N 49°46.27′W 3,423.1 km (2,127.0 mi) downrange from KSC USS Lake Champlain 38.6 km (24.0 mi)[66]
AS-201 NASA February 26, 1966 8°11′S 11°09′W 8,472 km (5,264 mi) downrange from KSC USS Boxer  ? km[67]
AS-202 NASA August 25, 1966 16°07′N 168°54′E 804.7 km (500.0 mi) southwest of Wake Island USS Hornet  ? km[67]
Gemini 2-MOL USAF November 3, 1966 8,149.7 km (5,064.0 mi) SE KSC near Ascension Island USS La Salle 11.26 km (7.00 mi)[68]
Apollo 4 NASA November 9, 1967 30°06′N 172°32′W USS Bennington 16 km (9.9 mi)[67]
Apollo 6 NASA April 4, 1968 27°40′N 157°59′W USS Okinawa  ? km[67]
Zond 5 USSR September 21, 1968 32°38′S 65°33′E USSR recovery naval vessel Borovichy and Vasiliy Golovin 105 km (65 mi)[69][70]
Zond 8 USSR October 27, 1970 730 km (450 mi) SE of the Chagos Archipelago, Indian Ocean USSR recovery ship Taman 24 km[71][72]
Cosmos 1374 USSR June 4, 1982 17°S 98°E 560 km (350 mi) S of Cocos Islands, Indian Ocean USSR recovery ship  ? km
Cosmos 1445 USSR March 15, 1983 556 km (345 mi) S of Cocos Islands, Indian Ocean USSR recovery ship  ? km
Cosmos 1517 USSR December 27, 1983 near Crimea, Black Sea USSR recovery ship  ? km
Cosmos 1614 USSR December 19, 1984  ? km W of the Crimea, Black Sea USSR recovery ship  ? km
COTS Demo Flight 1 SpaceX December 8, 2010 800 km (500 mi) west of Baja California, Mexico, Pacific Ocean  ? 0.8 km (0.50 mi)[73]
Dragon C2+ SpaceX May 31, 2012 26°55′N 120°42′W  ?  ?[74]
CRS SpX-1 SpaceX October 28, 2012  ? American Islander[75]  ?[76]
CRS SpX-2 SpaceX March 27, 2013  ? American Islander  ?[77]
Exploration Flight Test 1 NASA December 5, 2014 23.6°N 116.4°W / 23.6; -116.4 (EFT-1), 443 kilometres (275 mi) west of Baja California USS Anchorage
Crew Dragon Demo-1 SpaceX March 8, 2019 In the Gulf of Mexico, off the coast of Pensacola, Florida GO Searcher
SpaceX CRS-21 SpaceX January 14, 2020 In the Gulf of Mexico, off the coast of Tampa, Florida GO Navigator
Artemis I NASA December 11, 2022 Pacific Ocean, west of Baja California USS Portland 4 nm
  • The Apollo 15 spacecraft splashed down safely despite a parachute failure. (NASA)
    The Apollo 15 spacecraft splashed down safely despite a parachute failure. (NASA)
  • Apollo 15 splashdown (NASA)
    Apollo 15 splashdown (NASA)
  • Apollo 11 after splashdown (NASA)
    Apollo 11 after splashdown (NASA)
  • Apollo 13 hoisted onto ship (NASA)
    Apollo 13 hoisted onto ship (NASA)
  • Gemini water egress training
    Gemini water egress training
  • Recovery of the Dragon C2+ on May 31, 2012
    Recovery of the Dragon C2+ on May 31, 2012
  • Recovery of the EFT-1 Orion, December 5, 2014
    Recovery of the EFT-1 Orion, December 5, 2014
  • Landing of SpaceX Demo-2, 2 August 2020
    Landing of SpaceX Demo-2, 2 August 2020

See also

Notes
  1. "NASA article about American launch sites". NASA. May 14, 2009. Retrieved August 7, 2020.
  2. Archived at Ghostarchive and the Wayback Machine: "The Accidental Spacecraft Splashdown Which Almost Killed Its Crew" – via www.youtube.com.
  3. "Soyuz-23, Lands On A Frozen Lake". VideoCosmos. Archived from the original on April 14, 2012. Retrieved June 21, 2012.
  4. Bob Fish. "Apollo 11 & 12 Recovery". USS Hornet Museum's website.
  5. Clark, Stephen (January 12, 2021). "Cargo Dragon heads for splashdown off Florida's west coast". Spaceflight Now. Retrieved January 14, 2021.
  6. "AUDIT OF COMMERCIAL RESUPPLY SERVICES TO THE INTERNATIONAL SPACE STATION" (PDF). Archived (PDF) from the original on October 9, 2022.
  7. "Solar System Exploration: News & Events: News Archive: NASA Announces Key Decision For Next Deep Space Transportation System". Solarsystem.nasa.gov. May 24, 2011. Archived from the original on July 3, 2011. Retrieved June 21, 2012.
  8. Jain, U.; et al. (2021). "Air entrapment and its effect on pressure impulses in the slamming of a flat disc on water". Journal of Fluid Mechanics. 938 (4): A31. arXiv:2012.10137. doi:10.1017/jfm.2021.846.
  9. Jain, U.; et al. (2021). "Air-cushioning effect and Kelvin-Helmholtz instability before the slamming of a disk on water". Physical Review Fluids. 6 (4): L042001. arXiv:2106.09551. doi:10.1103/PhysRevFluids.6.L042001.
  10. Verhagen, J.H.G (1967). "The Impact of a Flat Plate on a Water Surface". Journal of Ship Research.
  11. Asryan, N.G. (1972). "Solid plate impact on surface of incompressible fluid in the presence of a gas layer between them". Izv. Akad. Nauk Arm. SSR Mekh.
  12. Ezell (1988) p. 143
  13. Ezell (1988) p. 144
  14. Ezell, Volume II, p. 145
  15. Ezell, Volume II, p. 146
  16. Ezell, Volume II, p. 147
  17. Ezell, Volume II, p. 148
  18. Ezell, Volume II, p. 159
  19. Ezell, Volume II, p. 160
  20. Ezell, Volume II, p. 161
  21. Ezell, Volume II, p. 162
  22. Ezell, Volume II, p. 163
  23. Ezell, Volume II, p. 164
  24. Ezell, Volume II, p. 165
  25. Ezell, Volume II, p. 166
  26. Ezell, Volume II, p. 167
  27. Ezell, Volume II, p. 168
  28. Ezell, Volume II, p. 188
  29. Ezell, Volume II, p. 189
  30. Ezell, Volume III, p. 83
  31. Orloff, p. 58
  32. Ezell, Volume III, p. 84
  33. Orloff, p. 78
  34. Ezell, Volume III, p. 85
  35. Orloff, p. 98
  36. Ezell, Volume III, p. 86
  37. Orloff, p. 120
  38. Ezell, Volume III, p. 87
  39. Orloff, p. 143
  40. Ezell, Volume III, p. 88
  41. Orloff, p. 168
  42. Ezell, Volume III, p. 89
  43. Orloff, p. 197
  44. Ezell, Volume III, p. 91
  45. Orloff, p. 225
  46. Ezell, Volume III, p. 92
  47. Orloff, p. 251
  48. Ezell, Volume III, p. 104
  49. Ezell, Volume III, p. 105
  50. Ezell, Volume III, p. 112
  51. "ASTP Apollo Miss Distance", ASTP Summary Science Report - Mission Description p. 36, Archived 2010-02-14 at the Wayback Machine
  52. "Cosmonauts Land in Lake, Blizzard". The Milwaukee Journal. UPI. October 18, 1976.
  53. "NASA Astronauts in SpaceX Capsule Make First Water Landing Since 1975". The New York Times. August 2, 2020.
  54. "SpaceX Dragon splashes down in Gulf of Mexico, bringing 4 astronauts home". Orlando Sentinel. May 2, 2021.
  55. "SpaceX capsule returns four civilians from orbit, capping off first tourism mission". CNN.com. September 18, 2021.
  56. Jackie Wattles. "SpaceX's wildly busy year continues with astronaut splashdown". CNN. Retrieved May 6, 2022.
  57. "Animals Survive 1,500-Mile Ride In Rocket Nose". The Windsor Daily Star. Windsor, Ontario. Associated Press. May 28, 1959.
  58. "Big Joe Shot". nasa.gov. Retrieved August 9, 2018.
  59. "Monkey Completes Long Flight Aloft". Ellensburg Daily Record. Ellensburg, Washington. December 4, 1959.
  60. "Man-In-Space Capsule To Be Closely Studied". The Florence Times. Florence, Alabama. Associated Press. December 20, 1960.
  61. "USS Donner LSD20". Homestead.com. Retrieved June 21, 2012.
  62. "Chimp Survives Space Shot". The Milwaukee Sentinel. Associated Press. February 1, 1961.
  63. "Space Capsule Soars 107 Miles High". The Florence Times. Florence, Alabama. Associated Press. February 21, 1961.
  64. "U.S. Robot Orbited, Returned". Meriden Journal. September 13, 1961.
  65. "Capsule Trouble Forces Early Landing Of Craft". Toledo Blade. Toledo, Ohio. Associated Press. November 29, 1961.
  66. "Gemini 2 Distance traveled, Landing Point, Miss Distance", Manned Space Flight Network Performance Analysis for the GT-2 Mission; Pg V - Distance traveled, Page 21 - Landing Point, Miss Distance, (NASA X-552-65-204)
  67. Mansfield, Cheryl L. (January 9, 2018). "Apollo-Saturn Unmanned Missions". NASA.
  68. "Titan 3 Gives Spectacular Space Show". Sarasota Journal. Sarasota, Florida. November 3, 1966.
  69. Michael Cassutt (2007). Red Moon. Tom Doherty Associates. p. 320. ISBN 978-1-4299-7172-0.
  70. "Zond 5, Landing Point, Miss Distance" Archived 2011-09-27 at the Wayback Machine, NASA Solar System Exploration - Zond 5, Landing Point, Miss Distance.
  71. Brian Harvey (2007). Soviet and Russian Lunar Exploration. Springer Science & Business Media. p. 218. ISBN 978-0-387-73976-2.
  72. "Zond 8, Landing Point" Archived 2011-09-27 at the Wayback Machine, NASA Solar System Exploration - Zond 8, Splashdown area.
  73. ""COTS 1 (SpaceX Dragon 1), Splashdown area"". Archived from the original on December 10, 2010.
  74. "History is made as Dragon splashes down safely in the Pacific! | Bad Astronomy | Discover Magazine". Blogs.discovermagazine.com. Archived from the original on July 5, 2012. Retrieved June 21, 2012.
  75. "American Island". marinetraffic.com. Retrieved August 9, 2018.
  76. "Dragon Returns to Earth". NASA. October 28, 2012. Retrieved October 29, 2012.
  77. "SpaceX brings home Dragon with 2,700 pounds of cargo". Spaceflightnow. March 26, 2013. Retrieved March 27, 2013.

Bibliography
  • The dictionary definition of splashdown at Wiktionary
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.