Lockheed proposed the L-133 in 1940 as a jet-powered fighter for high-altitude scouting and bomber interception, with a projected top speed of 612 mph. Its twin rear engines were to be powered by the ...

In jet engines, the U.S. and Britain are running a seesaw race for the title of the “most powerful” (see chart). Last week it looked as if Britain’s De Havilland Engine Co., Ltd. had jumped out ahead; ...