Cul de canard and popular with anglers and trout alike. The use of CDC's in fly fishing originated from the Jura Mountains during the 1920s where fly fishermen used this feather in dry flies to aid buoyancy in a particular pattern called Moustique. It took until the 1980s for popular use of this feather within a whole range of patterns. Cul de canard Cul de canard (CDC) (French for "duck bottom") are the feathers from the back of a duck directly around the preen gland (uropygial gland); they are very buoyant due to preen oil produced by the preen gland. They are used
Aviafiber Canard 2FL the main lifting surfaces were supported atop tall, V-shaped pylons which both generated lift and acted as vertical fins. Wings, pylons and canard have Wortmann FX-67-170 airfoil section. A further development of the concept can be seen in the Canard Aviation Canard SC, the production version of the 2FL. During flight tests of the SC, from 23 July 1983, progress was accelerated by the use of an auxiliary König SC 430 3-cyl. two-stroke radial engine mounted on a pylon between the V-struts and main-plane, driving a folding propeller. Results of flight testing with the engine running encouraged Farner and Bucher