Matt Giwer wrote:

Tony Sivori wrote:

Ah, you assume a lot. That kind of engineering may be impossible.

Actually there is only impractical (today) engineering. There is no such
thing as impossible engineering. There is only impossible science and the
observation is never believe a scientist who says something is impossible.

Then for "impossible engineering" substitute "never successfully executed".
The effect is the same.

-- 
Tony Sivori