Walter...
These distance lines....such as the Scientific Angler's Mastery XXD and the Rio, "LONGCAST" do allow the caster to carry more than 50' out of the rod tip before overhang appears, since the head (the combination of the forward taper and the belly) is more than 50' in total length. For practical purposes, the short rear taper can be ignored.
With full wt. forward fly lines, you need to be able to carry that much line as you false cast, since most casters can only shoot 20% or less of the length carried.
For great distance, it's best to drop one or two line designations when using these lines so you don't overload your rod.
This is very different than casting with a shooting head (shooting taper line) where the head may be only, say....30' in length and the remainder very thin and light running line or even mono. Here, one trick to carrying a lot of line AND lots of overhang for a very long cast, is to false cast with no more than 2' to perhaps 4' of running line out of the rod tip (overhang).....then suddenly increase the length of running line (overhang) on only the last back cast before the presentation cast......and shoot as much as possible.
To put it another way, it's very difficult to FALSE CAST with lots of overhang because you don't have heavy line turning over light line in front of it. There is not smooth transfer of energy, so the line tends to, "buck" and give the impression of, "hinging".
However, if the line behind you is straight, you can carry lots of overhang for the presentation cast. This is why you can lay out 75' of line on the grass behind you even though in includes 20' of overhang and with one motion make a distance cast to that distance and farther.
Gordy
From: Walter Simbirski <simbirsw@xxxxxxx>
To: Gordon Hill <hillshead@xxxxxxx>
Subject: Question about distance casting lines
Date: Mon, 27 Mar 2006 22:50:57 -0700
Gordy - I'm just reviewing some information on lines and it occurs to me that many of the distance casting linesactually incorporate extra long heads. Based on our discussions about underlining and overlining this wouldseem to be the wrong approach to designing a line intended for distance casting - unless the intent is havethe caster underline their rod significantly so that more line can be carried but at the same time reducethe amount of overhang?CheersWalter