F5b

F5b is a type of radio control electric model aircraft contest that consists of doing as many laps as possible between 2 poles 150 meters apart in 200 seconds followed by 10 minutes of thermalling, and then landing on a 30 meter landing circle. The laps must be made while gliding only, no motor allowed, so the motor is used to rapidly climb and power into the course. There is a limit of 10 climbs, so to get more than 20 laps (a complete circuit- to the far pole & back- is 2 laps) the plane must climb high and glide 4 laps. To score more than 40 laps, the plane must glide a combination of 4 laps sets and 6 lap sets.

A typical F5b aircraft is commonly referred to as a hotliner. For more information on the rules, one may refer to Fédération Aéronautique Internationale(FAI) Sporting Code Volume F5 Radio Control Electric Powered Model Aircraft, 2013 Edition http://www.fai.org/downloads/ciam/SC4_Vol_F5_Electric_2013

Vickers FB5 the Vickers F.B.5 (Fighting Biplane 5) (known as the "Gunbus" Introduction 5 February 1915) was a British two-seat pusher military biplane of the First World War.
Boeing FB-5 a United States single-seat open-cockpit biplane fighter aircraft of the 1920s, manufactured by the Boeing company.
a torpedo. See List of World War II torpedoes of Germany#List of World War II Luftwaffe torpedoes
Eurofly FB5 Star Light a single engine kit built Italian ultralight, seating two side by side.

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F5b

Further reading