Word: radar
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...cast doubts on what is, on paper, an impressive fighting machine. The plane can fly faster and farther than any earlier U.S. fighter-bomber and lift twice the bomb load (12,500 Ibs.). Its great strategic importance in Viet Nam was to be that its new inertial guidance and radar targeting system enables it to bomb in foul weather or fair, either by night or by day. Its arrival in force would thus mean that the U.S. could keep up its aerial bombardment of the North despite monsoon rains or heavy cloud cover...
Under the Net. The F-111 is the world's first combat plane with the so-called "variable geometry" wing, which extends for greater lift during takeoff and landing, folds back for less drag at supersonic speeds. Its "terrain radar," which automatically adjusts the plane's altitude to accord with the topography, is supposed to enable the plane to hug the ground while flying at a speed of 900 m.p.h. and thus dash in below the enemy radar net. If the first F-111 did hit a mountain, it was probably due to a malfunction in the terrain...
Street is one of the developers of radio navigation and group and ship radar. He has done important research on cosmic rays and on devices for detecting atomic particles. He is co-author of the a college text, General Physics. Since 1966, he has been assistant dean of the Faculty...
Painstaking preparations paid off. As Mercury began to move behind the sun, M.I.T. computers detected increasing delays in the return of radar signals slowed by the sun's gravitational field. Plotted against the theoretical delays predicted by the Einstein equations, the actual delay time formed a remarkably similar curve, increasing to approximately one five-thousandth of a second just before Mercury passed behind...
Test results, which Shapiro regards as only preliminary, could be inaccurate by as much as 20%, and still leave some room for doubt about relativity. But refinements in the radar technique could soon reduce the uncertainty to less than 1%, he says, and further confirm or definitely overthrow Einstein's general relativity...