With the Space Shuttle program coming to an end on September 16, Craig the Rocket Scientist is taking a look back at the program and its roots. If you haven’t yet read it, check out part 1.
In Part 1 I talked a little about the motivation of moving from large, disposable, heavy lift vehicles to smaller, reusable space transport system which would be able to launch every week to facilitate an orbital infrastructure.
It may feel like I’m retreading old ground, but I want to illustrate the point that everyone was interested in space, but there was very little coordination between all interested parties. NASA, the Air Force, and the President, all had very different ideas about what the future of American space flight was going to look like.
- NASA wanted a fleet of small shuttles (a term coined in a “purpose” section of an official invitation for production contract bids in 1970) to efficiently service a large space station, which would serve as a hub for science and exploration.
- The Air Force was looking for something to transport military astronauts into space that would be capable of launching and servicing large military satellites.
- The President wanted options, and wanted something economical.
In 1969 President Nixon formed the Space Task Group, chaired by vice president Spiro T. Agnew. In terms of function this group was very similar to the Augustine Commission, it’s goal was to develop several options for a post-Apollo NASA along with budget requirements for each option. This group returned with the following options:
- Manned missions to Mars
- Follow-on lunar missions
- An orbital infrastructure, including a large space station (12-24 people)
After the President selected the third option as the new direction for American space flight, NASA and the Air Force, cast their lots together, combing some of their ideas and abandoning others.
The Shape of Things to Come
In order to maintain its economical edge, this space transport system would need a large number of launches, meaning it would need to be at least partly reusable. However, what this system would look like was still a bit of mystery. Starting in the mid-60’s NASA had developed a series of trade studies on a possible system and The US Air Force had been working on its own space transport system called the DC-3. (No, not THAT DC-3.) Both systems being developed were two staged, and included an orbiter with fixed wings, allowing it to fly back to a specific landing spot.
Initially, NASA’s concept called for a 2-stage system. The first stage would essentially be a large fuel tank with wings, capable of lifting off vertically and delivering the second stage to a specific altitude after which the second stage would launch itself into space while the first stage was piloted back to earth not far from its launch site.
This set-up presented two problems: NASA didn’t have the budget to develop two separate vehicles, and the system would be too heavy to allow for the large payload that the Air Force required for its satellite launching/servicing missions.
In the end a number of features were cut from the design. First, the manned first stage was dropped and replaced by a disposable fuel tank; this lowered development costs and also increased shuttle payload since it no longer had to carry the bulk of its own fuel. Second, jet engines which would allow the Space Shuttle powered flight upon reentering the atmosphere were scrapped to allow for greater payload. Twin solid rocket motors were chosen for their low cost, high reliability, and partial reusability.
Design changes, budget issues, waffling support, and contractor in-fighting plagued the program all the way up to September 17, 1976 when the Space Shuttle Enterprise rolled out of the hanger for the first time. Originally this prototype / test article was to be named the Constitution but a massive letter campaign from sci-fi fans persuaded NASA to name the Shuttle after the Starship Enterprise from Star Trek. Sadly, the name Millennium Falcon was never considered… Sorry Mr. Solo.
It’s interesting to note just how much history repeats itself when looking at the early days of the shuttle program and the constellation program. Both have had to deal with constant budget issues, design issues, wavering support, and stubborn contractors refusing to play nice. If anything, this should give one some measure of hope for the Ares rocket!
The Space Shuttle rescuing Sky Lab? Yup, it was actually part of the plan. I’ll get into that more, next time in our third section of The History of the Space Shuttle.