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NJ:
Yes, I totally expect that to happen.

Hans' concern was whether or not the second it touched the water it would lie on its side.

Here it is, Steven, in the bowl:

http://i1101.photobucket.com/albums/g430/byhaugh/IMG_4283_zps91cbdec0.jpg

It passed the bowl test with flying colors. Not the true test, as I said, that will come when I fish it in June.
I think Hans may not have realized that the fly has splayed tails.

I know what Davie's imitates. It imitates a dun.
I am asking about the Improved F fly. I have read it may imitate a Caddis or a midge. No tail/shuck and no thorax. Looks more like an emerging...

And the upright floatation?

I notice in Davie McPhail's version of the F-Fly which he calls the F-Fly CDC Snowshoe Dun fly, he has tail fibers on his fly. Your pattern, and the original F-Fly,...

What do you think Hans?

The tails are splayed, which I think will provide stability. The underneath fold of CDC should also provide stability as it will ride quite low in the water.
Will photo it from above.

You think...

This is a size 18 PMD I have named the "B Dun". It was inspired by the "Improved F Fly" shown by Hans Weilenmann here.


http://i1101.photobucket.com/albums/g430/byhaugh/IMG_4281_zpse61f8abf.jpg