College student's dorm-built jet drone reaches 491 mph

A college kid built a drone in his dorm room that flies 491 mph. That's close to how fast the Southwest flight you took last Thanksgiving was cruising. Russia and Ukraine have spent the last two years racing to build faster drones, and he just passed every single one of them for about $13,000. Here's why speed matters so much over there. Russia's original Shahed attack drone putters along at about 115 mph, with an engine loud enough that Ukrainians nicknamed it the moped. Firing a $4 million Patriot missile at one makes zero sense, so Ukraine started building cheap little hunter drones to chase them down. The Sting costs around $2,500. By February it had taken out more than 3,900 Shaheds by itself, and in January hunter drones made about 70% of Ukraine's Shahed kills. The catch is you…