Thursday, January 15, 2009

Some black birds...!

Some birds are black color, and some float, and some have some color, and attractive...!
Black is stealthy, but on some surfaces it absorbs too much heat...!

Sr. 71

SR-71 strategic reconnaissance "blackbird"
The SR-71 remained the world's fastest and highest-flying operational manned aircraft throughout its career. From an altitude of 80,000 ft (24 km), it could survey 100,000 square miles (260,000 km2) per hour (72 square kilometers per second) of the Earth's surface. In addition, it was accurate enough to take a picture of a car's license plate from this altitude.[25] On 28 July 1976, an SR-71 broke the world record for its class: an absolute speed record of 1905.81 knots (2,193.17 mph, 3,529.56 km/h), and an "absolute altitude record" of 85,069 feet (25,929 m).[26][27] Several aircraft exceeded this altitude in zoom climbs but not in sustained flight.[28]
When the SR-71 was retired in 1990, one was flown from its birthplace at United States Air Force Plant 42 in Palmdale, California, to go on exhibit at what is now the Smithsonian Institution's Steven F. Udvar-Hazy Center (an annex of the National Air & Space Museum) in Chantilly, Virginia. The Blackbird, piloted by Colonel Ed Yeilding and Lt. Col. J. T. Vida, set a coast-to-coast speed record at an average 2,124 mph (3,418 km/h). The entire trip was reported as 68 minutes and 17 seconds. Three additional records were set within segments of the flight, including a new absolute top speed of 2,242 mph (3,608 km/h) measured between the radar gates set up in St. Louis and Cincinnati. These were accepted by the National Aeronautic Association (NAA), the recognized body for aviation records in the United States.[29][30] An enthusiast site devoted to the Blackbird lists a record time of 64 minutes.[31] The SR-71 also holds the record for flying from New York to London in 1 hour 54 minutes and 56.4 seconds, set on 1 September 1974. This equates to an average velocity of about Mach 2.68, including deceleration for in-flight refueling. Peak speeds during this flight were probably closer to the declassified top speed of Mach 3.2+. (For comparison, the best commercial Concorde flight time was 2 hours 52 minutes, and the Boeing 747 averages 6 hours 15 minutes.)

Much speculation exists regarding a replacement for the SR-71, most notably an aircraft identified as the Lockheed Aurora. This is due to limitations of spy satellites, which are governed by the laws of orbital mechanics. It may take 24 hours before a satellite is in proper orbit to photograph a particular target, far longer than a reconnaissance plane. Spy planes can provide the most current intelligence information and collect it when lighting conditions are optimum. The fly-over orbit of spy satellites may also be predicted and can allow the enemy to hide assets when they know the satellite is above, a drawback spy planes lack. These factors have led many to doubt that the US has abandoned the concept of spy planes to complement reconnaissance satellites.