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On a sunny Sunday afternoon in March, Dennis Spear watches his 15-year-old son Matthew Spear pilot a tiny metal drone through a course at a park outside Fresno. “[They’re] like a swarm of angry bees, ” Spear says. Drones have exploded in popularity as the price of the tiny machines has fallen. More than 700-thousand drones were sold in the United States last year. These drones aren’t what you may have seen in the neighborhood or heard about on the news. They are smaller than a Frisbee and are very light weight. But Dennis says don’t underestimate them. He says their size makes them really fast and nimble. “Compared to a high-performance jet aircraft, like a fighter aircraft, they might have two to one horsepower to weight ratio,” says Spear. “This has eight to 10 to one.” Some drones can reach tops speeds over 100 miles an hour. At a drone race pilots have to guide their drones through a series of physical obstacles. Such as flying around a pole, going under or over a certain “My
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