Unbeknownst to popular belief, the United States Airforce (USAF) had a project in the 1950s to design and build a fully-functional Flying Saucer. The project titled: Project 1794 did not meet the desired expectations and later scraped to collect dust in a museum...
-See additional photos, military test videos and design specs below:
Unfortunately this amazing project never 'took off'.... so to speak.
These are cutaway sketches of a 1950s design proposal for the USAF’s Project 1794. The purpose of this project was to build a supersonic flying saucer. According to documents alongside the project, the saucer was supposed to reach a top speed of “between Mach 3 and Mach 4, a ceiling of over 100,000 ft. and a maximum range with allowances of about 1,000 nautical miles”. If you'd hopped on the disk in New York it could've had you in Miami within 24 minutes.
The cost of building the prototype was estimated at $3,168,000, but the military pulled the plug in 1960 after the saucer was unable to meet desired expectations.