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Originally Posted by enfieldspares
You will find that a sinking line, say a Wet 2 or a Wet 4 is easier to cast and shoot that a floating line. It has the same weight, but is thinner. So it has less air resistance.
The only thing to beware of is that, unlike a floating line, you can't "lift" the whole line and recast in one movement. You will be trying to lift all the weight of water directly above the line!
You must either recover the line by fishing out your cast or if you want to take change direction then roll cast the line to the surface before lifting and casting the line.
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That is perfectly true, but not for a beginner who is used to casting a floating line. The first time beginners try to cast Hi-D lines, they invariably fail miserably. Usually they wrap it ( quite painfully!) around their neck and ears, and are lucky to avoid getting a fly in the face or worse.
Because the lines have very considerably less air resistance, ( actually "surface drag"), and the mass is of course more concentrated, they move a lot faster. This requires alteration of power application and cast timing. It has to be a lot faster! Without increasing power. This is very difficult for most beginners.
Also, the fact that one can not simply lift a sunken line into a back-cast, has nothing to do with the weight of the water, but is a result of fluid resistance ( also known as "surface drag") . The fluid resistance of water is many times greater than that of air, and of course is directly proportional to the speed with which the line is pulled through it. If you pull the line slowly, there is little resistance. If you try and haul it up at the speed necessary to commence a back-cast, the resistance is massive, and will likely break your rod.
http://www.phy.cmich.edu/people/andy...s/Chapter9.htm
Further, a sinking line of the same weight as a floater loads the rod more, as a direct result of it moving faster. The higher line speed results in greater momentum. This can be very difficult indeed for a beginner to compensate.
EDIT: Also, when roll casting a Hi-D head up to the surface, the timing needs to be impeccable, as the line starts to sink again as soon as the roll cast completes. This applies even if you manage to aerialise the line with the roll cast. If you mistime this, you have the same problem as if you tried lifting directly. This will also break your rod. It makes no difference whether the line is ten feet down, or only one inch. This does not apply to floating ( plastic) lines, as they are buoyant, displace water, and float "in" the surface film. Once they start to move and the grip of surface tension is relieved, there is no problem in accelerating them further.
Trying to lift a SUNK floating line, or indeed an intermediate, directly into a back-cast, results in identical problems.
TL
MC