Hello,
Yes, Hans, I posted a message about the F-Fly:
"For flies tied on hooks size 22 to 26, I would use F flies, body made of thread and a wing of CDC, they are easy to tie and very effectives"
As pointed out by Hans, the drawback is, they could quickly get waterlogged and be in or sub-surface.
I dry them in a paper towel and still tied to the tippet, I drop the fly in a small container with silica gel, 30 seconds and the fly is dry and fluffy, ready to cast.

By changing the winging technique this behavior is easily averted, and the fly will float much better over longer periods of time
.
Thanks to let us know the proper winging technique .
Cheers
Pierre