I just read an interesting little piece by Alec Jackson. He contends that all you need for summer runs is a chubby black fly in size 4 through 8 tied on both light and heavier wire hooks. He includes some light science and "common sense" reasons why this is so. I find it hard to argue with him since my most productive fly to date (19 years of striving to be adequate) has been the silver hilton, generally tied "chunky". Of course my number two is the muddler minnow, so who knows Anyone feel strongly either way?