Originally Posted by
EdD
John, you show your work beautifully and get full marks.
For those of us who want to cut to the chase, 1 mph = 1.46666666 ft/sec. or a little under 1 and a half fps.,,,
I thought about 1.4666 fps thing, but I also wanted to incorporate / illustrate typical current speeds and Byron's 10 second factor to make a point - the point being that when you are casting a dry fly to rising fish in a stream situation, the fly probably only has to float for a couple seconds at most, unless you are casting way far upstream of the rising fish.
Using the 1.4666 fps approach, if you are on a 3 mph stream and you cast approximately 5 feet above the rising fish, it will take the fly 1.36 seconds to reach the fish and if you are on a 4 mph stream and you cast approximately 5 feet above the rising fish, it will take the fly .86 seconds to reach the fish.
John
The fish are always right.
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