pistol petes
For fly casting, it seems to me you need natural current to help spin them (river), or you should be able to cast far, and spin them in. If you are a short distance caster (newbie me), it would be hard work. Or troll them.
"PISTOL PETES are proven to be consistent producers. The
propeller on PISTOL PETES attracts the fish's attention and
triggers strikes because it combines both "action" and "sound."
Many anglers fish PISTOL PETES with a light spinning rod
using a "fly and bubble" set up (see illustration below).This is
a particularly effective way to fish PISTOL PETES in lakes
using a slow, stop, and go, retrieve. Stripping PISTOL PETES
with a fly rod is another effective way to fish them in lakes. If you
are stream fishing PISTOL PETES on a fly rod, try casting across
or quartering downstream. Allow the current to swing your PISTOL PETE around as you would a small lure. You will often get strikes as the PISTOL PETE swings with the current. You will also get strikes as you strip the fly back upstream after it has completed its swing. Many anglers also have had good success trolling PISTOL PETES behind a boat. Placing a small split shot about six inches in front of the PISTOL PETE helps get the fly down. The pitch of the propeller can be changed to allow it to spin at the speed you desire. Experiment, you may find a fast propeller works better for you."
http://www.pistolpeteflies.com/FPP.htm