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[–]Tom_Bombadil[S] 3 insightful - 1 fun3 insightful - 0 fun4 insightful - 1 fun -  (0 children)

You do realize that second stage engines exist because ground level engines aren't efficient in a vacuum?

Of course.

Unfortunately, that doesn't fix the problem, because when there is zero atmospheric backpressure the rocket efficiency is going to plunge in the same way.

The second stage rockets use the same bell shaped design, so the improved efficiency is temporary. The same problem exists for all rockets.

Some may be more efficient, but getting to 100 miles from the surface in this way is a tall order... ;-)

Oh, and religion is make believe.

It sounds like space flight is your religion, cause you'll apparently believe anything they claim. :-/