Speed controls also have to be capable of reverse rotation, which means new firmware as well. We’re curious to see how the quadcopter community settles on the control systems for inverted flight.

Strapped for cash and feeling the same way, [Hans] over at the hackerspace Knackatory decided to build a quadcopter from ... tool battery bumps up the fan speed to 15,000 rpm.

The little quadcopter-type drone has a range of around 6 miles (10 kilometers) and a speed of 40 mph (65 kph). It also has a ...