So I break off from the narrative for a look at how I modify the ATL here:
This takes us back to Archibold's old quandary: 1) Keep exploring the moon, or 2) Retreat to LEO for a while to let technology mature? In this ATL, Low opts for reduced tempo Apollo Applications Program that, in effect keeps both options open. Only now I modify my ATL to drop the AES missions of 1975 and 1976 by moving straight to the more ambitious Lunar Exploration System for Apollo (LESA), which entailed a complete 10,500 to 12,500lb lunar base module launched directly to the Moon on a Saturn V, remotely landed with a quiescent capability, followed shortly by a manned crew landing nearby in an LM Taxi. NASA examined variants with and without a mobile MOLAB truck.
Skylab actually helps by buying an extra year or two of lag time while the Lunar Landing Vehicle (LLV) and related systems are developed and built. And both AAP follow-ons - Skylab (and Skylab B) buys NASA the knowledge to decide whether to focus on the moon or on LEO for the 1980's and possibly 90's is the way to go.
1971
Apollo 14 H Precision landings with up to two-day stays on the Moon Jan. 1971 (Shepard, Roosa, Mitchell)
Apollo 15 J Longer three-day stays using Extended LM, rover July 1971 (Scott, Worden, Irwin)
1972
Apollo 16 J Longer three-day stay using Extended LM, rover Apr. 1972 (Young, Swigert, Haise)
Apollo 17 J Longer three-day stay using Extended LM, rover Dec. 1972 (Cernan, Evans, Engle - Engle in this ATL stays on the Apollo 17 prime crew rather than being bumped for geologist Harrison "Jack" Schmitt)
1973
Apollo 18 J Longer three-day stay using Extended LM, rover July 1973 (Gordon, Brand, Schmitt) Apollo 18 lands, as projected, in Schroter's Valley. Schmitt finally gets his moonshot, and NASA's scientific community is mollified
Skylab 1 - Unmanned launch of Skylab station on Saturn V - November 1973
Skylab 2 - 28 day scientific mission in Skylab station - November 1973 (Conrad, Weitz, Kerwin)
Skylab 3 - 59 day scientific mission in Skylab station - January 1974 (Bean, Lousma, Garriott)
1974
Skylab 4 - 84 day scientific mission in Skylab station - May 1974 (Carr, Pogue, Gibson)
Apollo 19 - Lunar Orbit Survey Mission (LOSM) spending 30 days in lunar orbit using lunar orbital module, surveying "ground truth" sights for the LESA base - November 1974 (Haise, Lind, McCandless)
1975
Apollo-Soyuz (ASTP) - Joint US-Soviet LEO scientific mission using ASTP dock - July 1975 (Stafford, Slayton, Brand)
1976
*Apollo 20 LESA Unmanned Delivery of LEM LLV to Moon for Apollo 21 and 22 - Oct. 1976. The ultimate landing site was determined by the 1974 LOSM mission results. The choice: Copernicus Crater. The new LLV base is quickly named "Copernicus Base."
*Apollo 21 LESA 90 day stay in LLV base for 3 men - Nov. 1976 (Mitchell, Lousma, England)
*Apollo 22 LESA 90 Day stay in LLV base for 3 men - April. 1976 (Young, Schmitt, Kerwin)
1978
*Spacelab 1 - Unmanned launch of long duration Spacelab space station (Skylab B) - Dec. 1978
1979
Spacelab 2 100 day stay International expedition in Spacelab Jan. 1979 (Musgrave, Allen, ESA Scientist + a 22 day stay by Soviet Soyuz 27 - a seriously considered proposal in Skylab B planning in OTL)
Spacelab 3 100 day stay international expedition in Spacelab April 1979 (Garriott, Lenoir, ESA Scientist)
*Spacelab 4 100 day stay international expedition in Spacelab July 1979 (Parker, Henize, ESA Scientist)
* Requires new Saturn rocket buys, or completion of incomplete rockets
Note that the LESA approach was capable of supporting two crews in succession - so this actually eliminates one Saturn V launch. On the other hand, LESA was not cheap: $1.45 billion in development costs, not inconsiderable in view of NASA's annual manned spaceflight budget of only $1 to $2 billion in this timeframe. For this reason, as well as development time, I moved it back a full year to 1976 (technically, FY 1977) - still in time to benefit politically from bicentennial year optics.
Crew assignments after Skylab are conjecture based on available personnel and Slayton's tentative preferences. Slayton wanted to give Haise, Mitchell and Irwin shots at commanding their own moon missions; Irwin was in disgrace after the stamp incident, resulting in his being eased out of the flight rotation - easier to justify now that other astronauts were more willing to stay on board for an extended Apollo schedule. England and Schmitt being the only geologists in active rotation, they became obvious candidates for scientist slots on the 90 day LESA missions - which, after all, would be devoted to a long, grueling three month schedule of selenology.
The results of Apollo, LESA, and Skylab provided NASA by 1976 with sufficient knowledge to make the hard choice between Low Earth Orbit and further lunar exploration even before the Spacelab station was launched. An aggressive (and very astute) set of publicity events at Copernicus base, focusing on schools had created a little breathing space for NASA, even resulting in some slight real budget increases during the Carter Administration. The Moon was the bolder, more exciting choice, but it was also the riskier one. NASA had, after all, had some close calls along the way, Apollo 13's oxygen tank explosion being only the best known one, with Apollo 21's LM taxi life support failure supplying nearly as much drama...
This takes us back to Archibold's old quandary: 1) Keep exploring the moon, or 2) Retreat to LEO for a while to let technology mature? In this ATL, Low opts for reduced tempo Apollo Applications Program that, in effect keeps both options open. Only now I modify my ATL to drop the AES missions of 1975 and 1976 by moving straight to the more ambitious Lunar Exploration System for Apollo (LESA), which entailed a complete 10,500 to 12,500lb lunar base module launched directly to the Moon on a Saturn V, remotely landed with a quiescent capability, followed shortly by a manned crew landing nearby in an LM Taxi. NASA examined variants with and without a mobile MOLAB truck.
Skylab actually helps by buying an extra year or two of lag time while the Lunar Landing Vehicle (LLV) and related systems are developed and built. And both AAP follow-ons - Skylab (and Skylab B) buys NASA the knowledge to decide whether to focus on the moon or on LEO for the 1980's and possibly 90's is the way to go.
1971
Apollo 14 H Precision landings with up to two-day stays on the Moon Jan. 1971 (Shepard, Roosa, Mitchell)
Apollo 15 J Longer three-day stays using Extended LM, rover July 1971 (Scott, Worden, Irwin)
1972
Apollo 16 J Longer three-day stay using Extended LM, rover Apr. 1972 (Young, Swigert, Haise)
Apollo 17 J Longer three-day stay using Extended LM, rover Dec. 1972 (Cernan, Evans, Engle - Engle in this ATL stays on the Apollo 17 prime crew rather than being bumped for geologist Harrison "Jack" Schmitt)
1973
Apollo 18 J Longer three-day stay using Extended LM, rover July 1973 (Gordon, Brand, Schmitt) Apollo 18 lands, as projected, in Schroter's Valley. Schmitt finally gets his moonshot, and NASA's scientific community is mollified
Skylab 1 - Unmanned launch of Skylab station on Saturn V - November 1973
Skylab 2 - 28 day scientific mission in Skylab station - November 1973 (Conrad, Weitz, Kerwin)
Skylab 3 - 59 day scientific mission in Skylab station - January 1974 (Bean, Lousma, Garriott)
1974
Skylab 4 - 84 day scientific mission in Skylab station - May 1974 (Carr, Pogue, Gibson)
Apollo 19 - Lunar Orbit Survey Mission (LOSM) spending 30 days in lunar orbit using lunar orbital module, surveying "ground truth" sights for the LESA base - November 1974 (Haise, Lind, McCandless)
1975
Apollo-Soyuz (ASTP) - Joint US-Soviet LEO scientific mission using ASTP dock - July 1975 (Stafford, Slayton, Brand)
1976
*Apollo 20 LESA Unmanned Delivery of LEM LLV to Moon for Apollo 21 and 22 - Oct. 1976. The ultimate landing site was determined by the 1974 LOSM mission results. The choice: Copernicus Crater. The new LLV base is quickly named "Copernicus Base."
*Apollo 21 LESA 90 day stay in LLV base for 3 men - Nov. 1976 (Mitchell, Lousma, England)
*Apollo 22 LESA 90 Day stay in LLV base for 3 men - April. 1976 (Young, Schmitt, Kerwin)
1978
*Spacelab 1 - Unmanned launch of long duration Spacelab space station (Skylab B) - Dec. 1978
1979
Spacelab 2 100 day stay International expedition in Spacelab Jan. 1979 (Musgrave, Allen, ESA Scientist + a 22 day stay by Soviet Soyuz 27 - a seriously considered proposal in Skylab B planning in OTL)
Spacelab 3 100 day stay international expedition in Spacelab April 1979 (Garriott, Lenoir, ESA Scientist)
*Spacelab 4 100 day stay international expedition in Spacelab July 1979 (Parker, Henize, ESA Scientist)
* Requires new Saturn rocket buys, or completion of incomplete rockets
Note that the LESA approach was capable of supporting two crews in succession - so this actually eliminates one Saturn V launch. On the other hand, LESA was not cheap: $1.45 billion in development costs, not inconsiderable in view of NASA's annual manned spaceflight budget of only $1 to $2 billion in this timeframe. For this reason, as well as development time, I moved it back a full year to 1976 (technically, FY 1977) - still in time to benefit politically from bicentennial year optics.
Crew assignments after Skylab are conjecture based on available personnel and Slayton's tentative preferences. Slayton wanted to give Haise, Mitchell and Irwin shots at commanding their own moon missions; Irwin was in disgrace after the stamp incident, resulting in his being eased out of the flight rotation - easier to justify now that other astronauts were more willing to stay on board for an extended Apollo schedule. England and Schmitt being the only geologists in active rotation, they became obvious candidates for scientist slots on the 90 day LESA missions - which, after all, would be devoted to a long, grueling three month schedule of selenology.
The results of Apollo, LESA, and Skylab provided NASA by 1976 with sufficient knowledge to make the hard choice between Low Earth Orbit and further lunar exploration even before the Spacelab station was launched. An aggressive (and very astute) set of publicity events at Copernicus base, focusing on schools had created a little breathing space for NASA, even resulting in some slight real budget increases during the Carter Administration. The Moon was the bolder, more exciting choice, but it was also the riskier one. NASA had, after all, had some close calls along the way, Apollo 13's oxygen tank explosion being only the best known one, with Apollo 21's LM taxi life support failure supplying nearly as much drama...
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