In the 1950s a man named Otis T. Carr claimed to invent a flying machine that used an antigravity motor. He even took out a U.S. patent on his device. The patent was 2,912,244. It was patented as an amusement device. Carr claimed he had invented an antigravity engine called the Utron, or U-tron, the name is not clear. Carr offered to build and deliver the engine to the U.S. government without one penny of investment by the U.S. public. He claimed the engine could power a spacecraft to the moon in about 7 hours. "Any vehicle accelerated to an axis rotation relative to its attractive inertial mass, immediately becomes activated by free-space-energy and acts as an independent force…" said Carr.

Carr's engine had only two moving parts. The best way to visualize it is to think of two spinning tops one on top of the other and both spinning in different directions. Carr stated that when counter rotation matches forward rotation a body loses its polarity ....and acts as an independent force and this causes the counter rotating mass to become weightless and enables it to escape any gravitational forces. In 1952, an independent lab verified that a model of four inches in diameter, produced 1,000 tons of energy. The U.S. government didn't become interested, however, until the late 1950s.

It is said that Otis Carr had become friends with Nikola Tesla, the greatest electrical genius who ever lived, and conversed with him at his hotel on a regular basis. His vehicle was actually finished in 1947, but he couldn't interest anyone in it, although he tried repeatedly. Carr said the core of his space ship would be a huge battery which would spin at the velocity of the external craft and which would be recharged, he said, by its motion. Carr declared such a battery, built to any size, could be designed to power the largest electric generating plant, operate an automobile, heat a house or power any conceivable machine or device.

In 1957 Otis T. Carr, President and Norman Evans Colton, Director of Sales, were interviewed by radio host Long John Nebel. Nebel told the audience that O.T.C. Enterprises Inc. of Baltimore was selling the spacecraft for $20,000,000 each and the craft was a saucer shaped object. Nebel had a working model. Yes, a working model. Carr told Nebel that after the first few craft were built, that the price would drop to $4,000,000 each. Carr claimed that he had seen UFOs and they were electrified and he recognized that fact since he had been working on the same principle for years. Carr told Nebel that his design utilizes gravity, electromagnetism, and electromotive force and a relative field to get its functional operation. He said in plain English it's a central power core. Now this is what we call an 'accumulator.' In a vernacular sense, it is a factory. It is a storage cell, an accumulation of storage cells which provide an electromotive force in the same manner that any known battery produces an electromotive force. Carr also told Nebel that he had sent a brochure of his system to the president who was Eisenhower at the time, but never received an answer. Carr went on to explain the craft would have its own internal gravity at all times, and it could become almost weightless when landing and it didn't need a heat shield, because there would be an electrified field around it to protect it. (Sounds like the air spike)

On April 15, 1959 a launch event was held in Oklahoma City with hundreds of people invited. They were told a model saucer would rise 400 to 600 feet off the ground from a gravel pit. An announcement was made that the launch was being postponed due to a bad bearing, but Carr seems to have been admitted into the hospital for eight days with a lung hemorrhage, and it seems in preliminary preflight tests the accumulator developed a leak which sprayed mercury all over the inside mechanism.

Mr. Ahom, an employee of Otis Carr's company announced that he would go to the moon on December 7, 1959, the trip would take 5 hours and he would stay for 7 days and return. The ship he was going to use was 45 feet in diameter and weighed 30 tons, it was to be powered by the Utron engine. No more was heard about the trip. On June 2, 1960, Carr became very distressed by the fact it was being said his trip to California was for the purpose of selling stock. The U.S. Securities and Exchange Commission had an injunction placed against Carr, ordering him to stop selling unregistered stock.
In January of 1961 the Attorney General Of New York, Louis J. Lefkowitz said Carr had swindled $50,000.00. True Magazine called Carr a hoaxer.

Did the Utron saucer ever fly? I see no record of it. Could it have been a cover-up to hide advanced technology? It seems a possibility, but who knows. Just the fact Tesla may have had some input, no matter how little, makes one really wonder.
There are cases where the US government has taken inventions away by enforcing the patent secrecy law to stop inventors from putting their inventions on the market. This doesn’t seem to have happened in this case, but could the government have made Carr look like a fool? Perhaps this was the best way to stop his invention from going on the market. Maybe they even sabotaged it to prevent a successful demonstration. Yes, this sounds like a conspiracy theory and it might well be one. Why would the government do this if they did? Perhaps they were already working on a more advanced device which was similar and didn’t want the elements of the Carr device to be taken seriously by anyone, because it was the basis for their device. We have to remember there are companies which have worked on anti-gravity devices for many decades and there are rumors they have finally been successful.

I guess the other side of the coin is Carr could just have been a hoaxer. There are plenty of them around so this would not have been a surprise.