Cirrus SR Sport

Fk14 Polaris
Role	Two seat sports ultralight
National origin	Germany
Manufacturer	B&F Technik Vertrieb gmbh, Speyer
First flight	May 1999
Status	In production
Number built	90 by September 2008
Unit cost	€70,630 (assembled, 2011)

The B&F Fk14 Polaris, also called the FK-Lightplanes FK14, is a single-engine, low-wing ultralight aircraft which seats two side by side. Designed in Germany in the late 1990s, it remains in production.

The Cirrus SR Sport, simply called the Cirrus SRS, was a version of the B&F Fk14 Polaris that was intended to be marketed as a light-sport aircraft by US-based aircraft manufacturer Cirrus Design (now called Cirrus Aircraft), and was promoted from 2007 until its suspension in 2009 during the economic crisis.

Design of the B&F Fk14 Polaris, sometimes known as the Funk Fk 14 Polaris but not by its makers, began in 1998. It first flew in May 1999 and started in production the next year. It is a low-wing, single-engine ultralight, with enclosed accommodation for two seated side by side. Its largely glass fibre (carbon on the Fk14B variant) wing is mostly of parallel chord but toward the tips, where short span aluminium ailerons occupy the trailing edges, the leading edge is swept. Electrically operated Fowler flaps are fitted. Four flap settings are available: +0°, +10°, +20° and +32°. The wingtips incorporate short winglets. The fin and rudder are gently swept; the rudder is deep, reaching the lower fuselage line and moving in a cutout between the elevators. These rear flying surfaces are mass-balanced. The Polaris has spring-trimmed controls.

Until 2007 B&F offered a choice of steel framed or monocoque fuselage structures, but since then have produced only the latter. The occupants sit side by side under a single piece, forward-hinged canopy. The standard undercarriage is of tricycle configuration, though a conventional undercarriage is an option. The main legs are fuselage mounted spring cantilevers and the nosewheel is steerable. All wheels are spatted. The Polaris may be fitted with a ballistic parachute (BRS 5) as an option.