Fishing the fly with a spinning rod and a float. This is an old article. A newer version is available.
Fly but no flyrod
A lot of Danes fish the fly in a special way. They use a spinning rod and a bubble float. This rig has the advantage of making you able to fish with a fly, but do so without having to learn to cast with a flyrod -- or even buy one. Many fly fishers also prefer the method if the wind makes casting a fly hard or even impossible.
The method is generally considered the most efficient method for fishing se trout. A bubble float fisher will generally outfish both fly and spin fishers.
The buble float has to be of the type where the line runs through a tube in the center. This allows to float to slide up the line when the fish takes the fly. The fish won't feel the weight of the float, and the float won't keep the fish from running. The only problem with this rig, is in the landning phase, where the bubble above the leader will mean, that the fish will be landed with all the leader out of the top eye. This is only a really big poblem when your leaders get longer than 3 meters (9-10').
Many Danish fishers use leaders up to 5 meters when fishing bubble floats and a friend of mine uses a complicated construction with monofile line, a piece of intermediate fly line and a thin leader with split shot in front of the bubble. He catches a lot of fish by the way.
An advantage of the bubble method is that you can fish large and heavy flies on long and thin leaders. Flies as the Fair Fly and the Full Metal Jacket can be a pest to cast on a light fly rod. They work very well with a bubble.