US Air Force's 1950s Supersonic Flying Saucer Declassified

MrSeb writes "Tighten the strap on your tinfoil hat: Recently declassified documents show that the US Air Force was working on, and perhaps had already built, a supersonic flying saucer in 1956. The aircraft, which had the code name Project 1794, was developed by the USAF and Avro Canada in the 1950s. One declassified memo, which seems to be the conclusion of initial research and prototyping, says that Project 1794 is a flying saucer capable of 'between Mach 3 and Mach 4,' (2,300-3,000 mph) a service ceiling of over 100,000 feet (30,500m), and a range of around 1,000 nautical miles (1,150mi, 1850km). According to declassified cutaway diagrams, the supersonic flying saucer would propel itself by rotating an outer disk at very high speed, taking advantage of the Coand effect. Maneuvering would be accomplished by using small shutters on the edge of the disc (similar to ailerons on a winged aircraft). Power would be provided by jet turbines. According to the cutaway diagrams, the entire thing would even be capable of vertical takeoff and landing (VTOL). The fact that there are no disc-shaped aircraft in the skies today, though, suggests that the USAF's flying saucer efforts probably never got past the prototype stage."

Comments

Difficulties identifying flying objects

[mosb1000]

People's brains are not especially good at identifying objects above the horizon. We typically determine the size and distance of distant objects with visual cues because our stereoscopic vision is limited to close range. For example, we are able to determine the distance of a person because we know (generally) how big a person is. If there's something next to him, we can then know it's size (by comparing it's apparent size to the apparent size of the person) and distance (it's about the same distance as the person). But in the absence of these visual cues, we are unable to determine the size and distance (as well as a host of related factors such as velocity and acceleration) of objects. Moreover, even the color of objects is determined by visual cues, since we color correct images to account for differences in lighting.

This leads to a lot of difficulty in identifying objects in the sky. Since flying objects are not arranged in a plane, we can't use their position in relation to the horizon to approximate their distance. Nevertheless, we often do. The moon seems to be much larger when it's near the horizon because we assume objects near the horizon are much farther away (the moon also appears larger due to atmospheric distortion, but this effect is minor).