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Free flight (model aircraft)
Free Flight is the segment of model aviation involving aircraft with no active external control after launch. Free Flight is the original form of hobby aeromodeling, with the competitive objective being to build and launch a self controlling aircraft that will achieve the longest flight duration, within various class parameters.
== Description ==
The essence of free-flight is that the aircraft have no need for external control, for instance by radio. Aircraft of this type have been flown for over two centuries. They are designed to be inherently stable in flight; if disturbed by a gust of wind or a thermal current they will return automatically to stable flight. Their stability is achieved by a combination of design and trim, - the relationship between centre of gravity, wing and tailplane incidence and rudder setting.
With their much lower wing loading, free-flight aircraft fly much slower than the engine-powered radio-controlled aircraft that many people first think of when ‘model aircraft’ is mentioned. Most of them glide at little more than walking pace and few weigh more than 500 grams.
Usually the sole objective of free-flight competition is flight duration, and one of the sport’s fascinations and challenges is to design the most efficient aircraft within the various competition limits on parameters such as minimum weight, maximum wing area, and motive power.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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