Park flyers are a class of small, primarily electric-powered radio-controlled aircraft. The smallest class of park flyers are called micro planes, and are capable of being used in an enclosed area such as a gymnasium or a living room, while larger park flyers are usually flown at designated park flyer sites. Models with low flying speed are more susceptible to wind and turbulence. Park flyers weigh no more than 2 pounds (0.91 kg), allowing park flyers to have a speed limit of less than half of the current wind speed.