Kennedy's Real Moon Pledge & the Apollo Program

History of Space Exploration

Chapter 5 · Kennedy's Real Moon Pledge & the Apollo Program

Within weeks of Shepard's flight (Chapter 4), President Kennedy committed the United States to a lunar landing. This chapter covers that pledge, the rocket built to meet it, the Apollo 1 fire that nearly derailed it, and the sequence of missions that followed. The sources are three reference articles, on the Apollo programme, the Saturn V and Apollo 1. Their figures differ in places, and the chapter marks each difference and does not pick one.

The Pledge

On 25 May 1961 Kennedy proposed "landing a man on the Moon and returning him safely to the Earth" before the decade's end, saying: "I believe that this nation should commit itself to achieving the goal, before this decade is out..." In September 1962, at Rice University, he declared "We choose to go to the Moon," and explained the choice was "not because they are easy, but because they are hard."

The Gap From Chapter 4 Shepard flew on 5 May 1961, and the pledge came 20 days later. The source does not link them, and I did not find what Kennedy said about the Soviet flight in the speech. I note the dates only.

Scale and Cost

The Apollo article says the programme ran from 1961 to 1972, with the first crewed flight in October 1968. At its height it employed 400,000 people across 20,000 industrial firms and universities.

Two Cost Figures The article cites $25.4 billion in 1973 dollars, equivalent to $257 billion in 2020 dollars, and it also mentions an earlier reference to $25 billion, equivalent to $187 billion in 2024 dollars. The two conversions are $70 billion apart, and they use different years and, I suspect, different methods. The source does not explain the difference and I did not investigate it. Treat any modern-dollar figure as an approximation.

The Saturn V

Feature	What the source says
Size	363 ft (111 m) tall and 33 ft in diameter. Fully fuelled mass ranged from 2.8 to 3.0 million kg.
Thrust	33,000 kN at sea level from the first stage, and about 34.5 meganewtons in total.
Payload	Roughly 140,000 kg to low Earth orbit and about 43,500 kg to the Moon.
Stages	S-IC (five F-1 engines), S-II (five J-2 engines), S-IVB (one J-2 engine).
Builders	Boeing built the S-IC at New Orleans, North American Aviation the S-II in California, and Douglas the S-IVB at Huntington Beach.
Development	"Scientists relocated from Nazi Germany," particularly von Braun, led technical design at the Marshall Space Flight Center in Huntsville, which managed overall development.

The Link to Chapter 2 Chapter 2 gave von Braun's route from Peenemünde through Paperclip and Redstone to the Marshall Space Flight Center in 1960. This is where that path ends up, as the source describes it. The source does not say how much of the design was his personal work as against his team's, and I did not find out.

Payload Units and Flight Counts Do Not Match The Apollo article gives a lunar payload of 96,800 pounds, later 103,600 pounds. The Saturn V article gives about 43,500 kg. 96,800 lb is about 43,900 kg and 103,600 lb about 47,000 kg, so the figures are consistent only if the 43,500 refers to an early mission. That is my arithmetic, and neither source says so. The Saturn V article also says thirteen were launched between 1967 and 1973 with twelve successful, and that the programme landed "24 astronauts on the Moon across nine missions." The Apollo article says six successful landings and twelve people who walked the surface. Twenty-four appears to count all who went to the Moon, including those who orbited, and not those who walked, but the source does not explain the wording, so I do not adopt it.

The Saturn V article notes that on Apollo 6, "J-2 engine problems caused early shutdown of two engines in the second stage, and prevented third stage restart," though the mission ultimately succeeded as an uncrewed test. It is the only failure the source names.

Deciding How to Get There

Lunar Orbit Rendezvous was adopted in 1962 after initial scepticism. The article says John Houbolt championed the approach and that it "proved crucial for meeting Kennedy's deadline." I did not find what the alternatives were or why they were rejected, so the chapter does not describe the technique.

Apollo 1

On 27 January 1967, Command Pilot Gus Grissom, Senior Pilot Ed White and Pilot Roger Chaffee died in a cabin fire during a launch rehearsal test at Cape Kennedy. It was a "plugs-out" test simulating internal power, and the fire began at 6:31 pm EST.

Finding of the review board	Detail
Ignition source	Likely electrical arcing from stripped wiring near the Environmental Control Unit, possibly involving electrolysis of ethylene glycol coolant. The source says "likely" and "possibly."
Atmosphere	The cabin held pure oxygen at 16.7 psi, over five times normal atmospheric oxygen, making materials highly flammable.
Hatch	A plug-door hatch could not open against internal pressure, and Grissom could not reach the vent valve to equalise it. Ground crews took five minutes to open the hatch layers.
Materials	34 square feet of Velcro and nylon netting burned readily in the oxygen.
Preparedness	The test was deemed non-hazardous, and rescue equipment and personnel were inadequate.

The article says the primary cause of death was cardiac arrest from carbon monoxide exposure. The Apollo 204 Review Board was chaired by Floyd L. Thompson and included astronaut Frank Borman and spacecraft designer Maxime Faget, and it completed its investigation by 5 April 1967.

What Changed

Launch atmosphere changed to 60 percent oxygen and 40 percent nitrogen at sea-level pressure, venting to 5 psi during ascent.
Nylon spacesuits were replaced with Beta cloth (fibreglass and Teflon).
An outward-opening hatch was made operable in under five seconds.
Flammable materials were replaced with self-extinguishing alternatives, and wiring and plumbing insulation improved.

Twenty Months Crewed flights were suspended for twenty months, and the first successful crewed Apollo mission was Apollo 7 in October 1968, flown by the original Apollo 1 backup crew. The source adds that Gene Kranz directed that Mission Control embody "Tough" and "Competent" standards, and that NASA reapplied the principle after the 2003 Columbia disaster. Chapter 7 covers the shuttle disasters, and I did not check the Kranz attribution against another source.

The Missions

The Apollo article names Apollo 7 as the first crewed flight, Apollo 8 as the first lunar orbit and Apollo 11 as the first landing, on 20 July 1969. Apollo 17 in December 1972 was the final mission. Chapter 6 covers Apollo 11 in detail.

What I Did Not Verify I did not find the reasoning behind Kennedy's decision, the politics and budget debates, the Gemini programme that lay between Mercury and Apollo, the command and lunar modules, the Soviet lunar effort, or the missions between Apollo 8 and Apollo 11. Nor did I verify any of the engineering figures against another source. The chapter reports headline numbers and one accident.

Hands-On Exercises

Exercise 1

List the causes of the Apollo 1 fire that the review board identified, mark which the source hedges, and list two changes made afterwards.

→ Solution

Exercise 2

A student writes "24 astronauts walked on the Moon." Use the chapter to correct it and explain where the confusion may come from.

→ Solution

Exercise 3

The chapter gives two cost figures for Apollo. Explain how you would decide which to quote and what you would need to check.

→ Solution

Quick Reference

Pledge: 25 May 1961, Moon landing and safe return "before this decade is out"; Rice speech September 1962
Programme: 1961 to 1972; 400,000 people; cost $25 billion or $25.4 billion in period dollars (modern conversions differ)
Saturn V: 363 ft; three stages; Marshall managed development; thirteen launched 1967 to 1973
Apollo 1: 27 January 1967; Grissom, White, Chaffee; pure oxygen, inward hatch, flammable materials; 20-month suspension
Landings: six; twelve walked; Apollo 11 on 20 July 1969; Apollo 17 in December 1972
Not covered: Gemini, the modules, the politics