Editing Control line (section)

===Speed (F2A)===
[[Image:faispeed 2004wc.jpg|thumb|320px|A typical FAI {{convert|0.15|cuin}} speed model - with control lines stored on reel between flights. The very long inboard wing acts as a fairing for the control lines, greatly reducing aerodynamic drag]]
Speed is divided up into different [[engine]] capacity classes and a Jet class (using pulse jet engines). As the name suggests, the idea is to have the model go as fast as possible. The model is timed over a number of laps, and the pilot must hold the handle controlling his model in a yoke on top of a pole in the center of the circle. This is in order to stop the pilot from assisting the model to go faster by increasing the line [[tension (physics)|tension]] and leading the model (known as whipping). Monoline control systems are common in the US, but international classes require the use of two-line control. Speeds of the fastest models - Class D {{convert|0.60|cuin}} and Jet - have in the past exceeded {{convert|220|mi/h|km/h|abbr=on}}. Current US rules limit the speeds to <{{convert|200|mi/h|km/h|abbr=on}} by requiring the use of larger lines if {{convert|200|mi/h|km/h|abbr=on}} is exceeded. Speed models are usually launched from a "dolly" - a cart that permits a lengthy ground roll for takeoff, but drops away in the air to reduce drag. The airplane lands on a skid or belly pan.