"Lousy requirements did it for them both." This cannot be repeated too often.
The observation is true and sums up how politics has trumped engineering so often over the years.
A lot of unwarranted misinformation has been posted about the X-33. Like the (Jupiter Direct) Space Launch System, it is a tale of politics over engineering. The result is that the aerospike was...
Well, going back over the public documents and depending on the mile stones selected, SpaceX and Orbital are either on time or nearly three years late or some combination.
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