f1C

F1C is a class of model aircraft competition under the Fédération Aéronautique Internationale (FAI), within the F1 family of aeromodelling categories. It is the power-model class, focusing on small internal-combustion engine powered aircraft designed for free flight.

Governing rules: F1C is defined in the FAI Sporting Code and related regulations. The class specifies limits on engine displacement, overall weight, dimensions, propeller size, and safety equipment. Aircraft are typically built from lightweight wood and composite materials and designed to maximize duration of powered flight followed by unpowered glide. Engines are miniature internal-combustion units using approved fuels and lubricants; reliability, repeatability, and safety are central to competition.

Competition format: At events, pilots perform a powered flight during which the engine runs for a fixed time, followed by a glide to a landing. The flight duration is timed from launch to landing and is limited by the class rules. Scores are based on the achieved flight time, with penalties possible for late starts, late finishes, or safety infractions.

History and reach: F1C has long been part of international aeromodelling, with national championships and the FAI World Championships featuring power-model events. The class attracts participants from many countries and emphasizes precision construction, meticulous maintenance, and consistent performance.

It is one of several F1 aeromodelling categories used in national and world championships.