Dr. Todd Reichert, who was the first person to successfully fly a human-powered ornithopter and recently completed his PhD at the University of Toronto Institute of Aerospace Studies, has debunked claims by a Dutch man that he created a “semi-human-powered” flying machine.

In a series of videos posted on YouTube, Jarno Smeets constructed and appears to fly in a suit featuring fabric wings attached to a small motor to amplify his arm movements. Though the results look impressive, it’s nothing more than a hoax, something Smeets now admits.

Speaking to Popular Mechanics , Dr. Reichert explained that while the wings appeared too short and the power unit too small, what made it evident that the video was a fake was the takeoff. In an interview with The Huffington Post, Dr. Reichert said that Smeets just wasn’t moving fast enough. “Unless this guy can blow by Usain Bolt in a sprint, he’s not going to reach takeoff speed by running,” he explained.

You can read more about the controversy by following the links above.