Danger Room describes 7 Secret Ways America's Stealth Armada Stays Off the Radar. "But in addition to shaping and RAM, the Pentagon's current stealth planes -- the B-2 Spirit bomber, the F-22 Raptor fighter, the RQ-170 Sentinel drone and the in-development F-35 Joint Strike Fighter -- boast other, lesser-known qualities that help them avoid detection. (We left the Army's stealth helicopter out of the discussion owing to a lack of information.)
These other stealth enhancements include: chemicals to eliminate telltale contrails; sophisticated, untraceable sensors and radios; specially designed, hard-to-detect engine inlets; radar-canceling paint; and cooling systems for reducing a plane's heat signature. All of these evasion methods have been disclosed by the Air Force, although sometimes in scant detail."
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