At Edwards Airforce Base, California, the veteran rocket plane pilot, Scott Crossfield, flew an X-15 equipped with the most powerful aircraft engine ever built—and said it is "even hotter than expected"—topping all prediction. Its acceleration was so abrupt, he said, it was "almost like an explosion." He made this prediction for the sleek rocket plane, expected to soar to the edge of space: "I'm sure it will exceed all our expectations. We have overestimated the drag (wind resistance) of the plane with its new engine."
Although under orders to hold the engine at half throttle, Crossfield zoomed to nearly 80,000 feet at the top speed close to 2,000 miles per hour. That's no record. Other X-15s, with smaller engines and flown by other pilots, have gone 2,196 m.p.h. and reached 136,500 feet. On all our flights with the big engine, the X-15 is expected to hit 4,000 m.p.h. and streak perhaps 100 miles high.
The new engine called the ZLR-99, burns liquid oxygen and anhydrous ammonia and develops a thrust of 57,000 pounds.
But more meaningful for the welfare of humanity is when God answers prayer speedily as David asked Him to: "Bow down thine ear to me; deliver me speedily: be thou my strong rock, for an house of defence to save me" (Psalm 31:2). More meaningful for the welfare of those who trust in God is to have the experience set forth in these words:
Then shall thy light break forth as the morning, and thine health shall spring forth speedily: and thy righteousness shall go before thee; the glory of the Lord shall be thy reward. Then shalt thou call, and the Lord shall answer; thou shalt cry, and he shall say, Here I am (Isaiah 58:2,8).