Saturn V

On January 25, 1962, NASA gave its approval to build the C-5. The three-stage rocket would consist of the [[S-IC]] first stage, with five F-1 engines; the [[S-II]] second stage, with five J-2 engines; and the [[S-IVB]] third stage, with a single J-2 engine.{{sfn|Bilstein|1980|page=|pp=58-59}} The C-5 would undergo component testing even before the first model was constructed. The S-IVB third stage would be used as the second stage for the C-1B,{{sfn|Bilstein|1980|page=160}} which would serve both to demonstrate proof of concept and feasibility for the C-5, but would also provide flight data critical to the development of the C-5.{{sfn|Bilstein|1980|page=161}} Rather than undergoing testing for each major component, the C-5 would be tested in an "all-up" fashion, meaning that the first test flight of the rocket would include complete versions of all three stages. By testing all components at once, far fewer test flights would be required before a crewed launch.{{sfn|Von Braun|1975|page=50}}

On January 25, 1962, NASA gave its approval to build the C-5. The three-stage rocket would consist of the [[S-IC]] first stage, with five F-1 engines; the [[S-II]] second stage, with five J-2 engines; and the [[S-IVB]] third stage, with a single J-2 engine.{{sfn|Bilstein|1980|page=|pp=58-59}} The C-5 would undergo component testing even before the first model was constructed. The S-IVB third stage would be used as the second stage for the C-1B,{{sfn|Bilstein|1980|page=160}} which would serve both to demonstrate proof of concept and feasibility for the C-5, but would also provide flight data critical to the development of the C-5.{{sfn|Bilstein|1980|page=161}} Rather than undergoing testing for each major component, the C-5 would be tested in an "all-up" fashion, meaning that the first test flight of the rocket would include complete versions of all three stages. By testing all components at once, far fewer test flights would be required before a crewed launch.{{sfn|Von Braun|1975|page=50}}

The C-5 was confirmed as NASA's choice for the Apollo program in mid 1962,{{sfn|Bilstein|1980|page=161}} and was named the Saturn V in February 1963.{{sfn|Wells|Whiteley|Karegeannes|1976|page=20}} Also the same month, the "C" designations were dropped; the C-1 became the Saturn I and C-1B became Saturn IB.{{sfn|Bilstein|1980|page=161}}{{sfn|Wells|Whiteley|Karegeannes|1976|page=19}} By November, 1962, NASA had switched and confirmed a [[Lunar orbit rendezvous]] (LOR) method for a lunar mission.{{sfn|Bilstein|1980|page=68}} The outside contractors that were chosen for the construction were: Boeing ([[S-IC]]),{{sfn|Bilstein|1980|page=192}} North American Aviation ([[S-II]]),{{sfn|Bilstein|1980|page=192}} Douglas Aircraft ([[S-IVB]]),{{sfn|Bilstein|1980|page=160}} and IBM ([[Saturn V Instrument Unit|instrument unit]]).{{sfn|Bilstein|1980|page=245}}

The C-5 was confirmed as NASA's choice for the Apollo program in mid 1962,{{sfn|Bilstein|1980|page=161}} and was named the Saturn V in February 1963.{{sfn|Wells|Whiteley|Karegeannes|1976|page=20}} Also the same month, the "C" designations were dropped; the C-1 became the Saturn I and C-1B became Saturn IB.{{sfn|Bilstein|1980|page=161}}{{sfn|Wells|Whiteley|Karegeannes|1976|page=19}} By November, 1962, NASA had switched and confirmed a [[Lunar orbit rendezvous]] (LOR) method for a lunar mission.{{sfn|Bilstein|1980|page=68}} The outside contractors that were chosen for the construction were: Boeing ([[S-IC]]),{{sfn|Bilstein|1980|page=192}} North American Aviation ([[S-II]]),{{sfn|Bilstein|1980|page=192}} Douglas Aircraft ([[S-IVB]]),{{sfn|Bilstein|1980|page=160}} and IBM ([[Saturn V Instrument Unit|instrument unit]]).{{sfn|Bilstein|1980|page=245}}

=== Selection for Apollo lunar landing ===

=== Selection for Apollo lunar landing ===

{{See also|Project Apollo#Choosing a mission mode}}

{{See also|Project Apollo#Choosing a mission mode}}