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SR 71 Blackbird replaces A12
www.popularmechanics.com/science/air_space/1282426.htmlOne of the features about UFO sightings that has consistently baffled the experts is their apparent ability to swoop downward, hover and then soar into the sky at impossible speeds.

Viewed head on, this is exactly how an A-12 or an SR-71?its J58-powered successor?appears to move at times during a normal flight. The maneuver is called a "dipsy doodle."

Col. Richard H. Graham, who commanded the U.S. Air Force 9th Strategic Reconnaissance Wing and has written a history of the SR-71 titled SR-71 Revealed, recently explained the dipsy doodle to PM. The pilot begins by climbing to about 30,000 ft. with the afterburners glowing. At about 33,000 ft., with the plane at Mach .95, he noses the aircraft over. Heading down at a pitch as great as 30 degrees, the plane falls as fast as 3000 ft. per minute. After 10 to 20 seconds, the pilot pulls out of the dive, then accelerates skyward at more than twice the speed of sound.

There is one more very UFO-like characteristic of the SR-71: The glow of its exhaust periodically turns green.

The SR-71 burns fuel modified to withstand high temperatures. It doesn't light easily. "One early 'hiccup' was ignition," Crickmore recalls. "The [J58] engine would not start no matter what procedure was tried."

Eventually the problem was solved by the introduction of a chemical that explodes on contact with the atmosphere. Graham says it must be introduced into the engine when it is started, and it also kicks-in the afterburners. This happens after each aerial refueling, which, given the SR-71's enormous thirst, is quite often. Each time, it produces another image that could be misinterpreted as a UFO?flashing colored lights.

The green flash and distinctive dipsy doodle can be spotted from miles away. Observing the pattern created by these strange sights provides a map to the SR-71's target area, giving those on the ground enough time to hide whatever the spyplane has been sent to photograph.

Curiously, the ebb and flow of UFO sightings in the Southwest correspond with the comings and goings of secret aircraft. Some of the most intense UFO spottings coincided with the testing of the F-117A stealth fighter, which was stationed just west of Area 51. These may account for the yet unexplained sightings.

What better way to hide extraordinary aircraft than to wrap them in the compelling fiction of aliens?





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