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The FAA’s Lunsford said it is very difficult during engine certification to duplicate on a ground test stand all the conditions that affect an engine in flight, including the angle of climb, the air turbulence from the fuselage and wing, and the relative angle of the wind.

He coughed, and shook sweat from his face, and held the ship at the correct angle of climb.

As it bore into the upper atmosphere on an ever-increasing angle of climb, its own artificial gravity system took over and gave the illusion of horizontal flight with the Earth receding slowly behind.