Sometimes models with landing gear are flown by using a "stooge" that holds the airplane until released by the pilot from the center, usually with a spring-loaded pin pulled with a string. This allows a pilot to practice with no helper, and is common with stunt fliers trying to practice extensively. This has the potential to be dangerous if the pilot fails to properly reset the stooge, the wire connecting the stooge to the airplane (usually attached to the tail wheel) breaks, the stooge moves under the thrust/vibration of the engines, or the pilot's feet get tangled in the stooge release line.