The Leopold Stimi is pretty much just a stimulator with a foam body and foam extensions on either end of the hook. It acts as a great attractor fly and does a very good job as the hopper on the hopper-dropper set up, it can even handle some pretty hefty droppers and still float high. The story behind the name is that it was first tested in the Aldo Leopold Wilderness of New Mexico chasing Gila Trout.
While I know this isn’t a new pattern, this is my spin on it and it seems to fish pretty well for me!
Hook: size 10 long shank dry fly hook
Thread: color of your choice 70 denier (I used grey and olive for these flies)
Foam: Thin cut strip approximately 1 cm wide
Body Thread: Orange and yellow silk floss
Body Hackle: Size 18 Whitings grizzly hackle
Wing: Natural deer hair
Front Body: Tan/Brown Natural Dub (optional)
Front Hackle: Size 14 Whitings grizzly hackle (optional)
Legs: Rubber legs, dealers choice on the color but leave them long (optional)
This fly has endless ways to substitute colors (foam, body thread, hackle, dubbing, legs and even the base thread). What I like most about it is the added length of foam that make for a more realistic head and the much improved flotation of the foam body. If you tie some up I would love to see some pictures of the flies and the fish they bring you!