AvWeek: Russians Admit Testing F-117 Lost in Yugoslavia
By David A. Fulghum and Robert Wall/Aviation Week & Space Technology
05-Oct-2001 2:36 PM U.S. EDT
MOSCOW and ZHUKOVSKY, RUSSIA — Russian officials admit for the first time they are using remains from the U.S. Air Force stealth fighter shot down over Yugoslavia to improve the ability of their air defense systems to detect and kill stealth aircraft.
Also as part of the effort, designers say a small number of Russian tactical aircraft have been upgraded with locally produced, low-observable modifications to further test and improve their surface-to-air missile (SAM) designs.
Acknowledging that researchers had access to the remains of the F-117 strike aircraft shot down in 1999 during the Kosovo air campaign, a senior Russian aerospace official said, "Yes, of course. We've been able to test our system against the broken pieces."
BUT THE FIND IS PROVING somewhat less than a Rosetta stone to unlocking the secret of targeting stealthy aircraft. Because only sections of the F-117 survived intact, "we haven't been able to model the entire [low-observable bomber]," the official conceded. "It's not the same as testing against an undamaged F-117. You provide us with a complete stealth aircraft and then we'll tell you how effective we are against it."
One of the problems engineers face with having the F-117 parts is that they can't accurately determine how radar energy is dissipated over the entire aircraft.
Furthermore, the faceted stealth design of the F-117 won't necessarily provide many clues to how best to defeat the stealth designs on the B-2 or the F-22. These aircraft use different materials and handle radar energy differently.
Even so, the F-117 analysis represents only a portion of Russia's antistealth efforts. Experts also have been pursuing other ways to fine-tune…
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