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Helix or "Acid Wrap"

An Helix Rod or "Acid Rod" is a conventional or casting rod who's guides start out on top of the
blank and then rotate around the rod leaving the final guides and tip under the blank. This
guide placement reduces torque allowing you to fight larger fish on lighter tackle with less fatigue.

Here are several definitions covering variations of the name, taken from the rodbuilding.org glossary:

Acid Wrap -
"Another term for the spiral wrap. The term originated on the West Coast when one proponent of the wrap
"Jim Racela" was said to have been on "acid" when he wrapped his rod in spiral fashion."

Spiral Wrap -
"A method for taking the line to the bottom of the rod on conventional casting type rods. Results in a rod
which will not twist under load and is inherently stable."

Robert's Wrap -
"Another term for the spiral wrap named after rod builder Chuck Roberts, another proponent of spiral
wrapping for casting rods."

A very good explanation and diagram are located at:

www.aarollerguides.com/spiral_advantages.asp

Under load, conventional "top guide" rods have a natural tendency to twist or torque, trying to turn the tip
downward. While few have ever had a rod flip over in their hand during a fight, many have felt the fatigue
of a long fight with a large fish due to their "death grip" on their rod. Not many even realize how hard they're
squeezing their grip while fighting a "big one". That's just what a big fish does... It tries to rip the rod from
your hands!

Those who trade off the line twist associated with spinning reels for their castability and "ease of use" don't
feel that twisting that we die hard casting rod users do. With the tip and guides on the bottom of their
blanks, they have a more stable fishing platform than we do.

You'll also notice that a heavy 7' spinning rod often has fewer guides than a casting rod of the same
size. This is because with their guides under the blank, they don't need nearly as many guides to keep
the line off the blank. Picture a 7' conventional rod fully loaded. It has to have at least eight guides
to keep the line from touching the blank. The same size spinning rod on the other hand, could do the same
job with six to seven guides while still evenly distributing the load on the blank. More importantly, guides
under the blank can be smaller, lighter and sit closer to the blank as they don't need ring height to keep the
line up off the blank. A "guides on top" conventional casting rod needs a taller, usually much heavier
"double Foot" guide to keep the line up off the blank when it's loaded.

Less guides are better? In most ways, the answer is YES. Fewer guides mean less weight over the length
of the blank, especially the tip section. Less weight added to the blank makes a more sensitive, more
responsive rod. You still need enough guides under the rod to distribute the load evenly and maximize the
blank's available power. On a 7' rod, this can normally be done with one less guide if Spiral Wrapped rather
than wrapped "guides on top". Combine that weight savings with the weight saved by not having to use a
heavier "Double Foot" and you've saved a considerable amount of weight. Believe it or not, a weight
savings of only a couple of grams can make a big difference.

www.acidrod.com

Action/Power

Rod Characteristics and Impact to Technique and Presentation

By Eddie Taylor
Edited by Mike Goodson

When talking about construction of rods, or when looking at buying a rod, there are several terms used; primarily "action" and "power". Many folks assume these terms to be interchangeable, but they are not. They each describe unique characteristics that affect rod performance, how the bait is presented and ultimately how, or if, you catch fish.
Let's get one thing straight: Not understanding the difference between action and power will not prevent you from catching fish. However, knowing the differences and understanding how they affect your application and presentation will make you better and land you more fish. It's like the saying "when all you have is a hammer in your toolbox, everything is a nail." You can catch fish with a broom handle and twine, but this will limit your options and opportunities. Hopefully, if you read this article, at the end you will understand why.

ACTION:

Action refers to the "movement" of the blank. How and where the blank flexes dictates the action. A "fast" blank will flex in the upper one-third of the blank, while a slow "softer" blank will be more parabolic and flex almost over the upper three-fourths of its length.
Think of action as how "fast" it takes for the blank to return to "rest" after being put under load. A fast blank is not going to flex very far from its resting state. Once the load is released it will not take long for the blank to return. Conversely, a "slow" blank is going to flex in the top three-fourths of the blank. The range of motion is going to be much greater and will take longer for the blank to return to the at-rest state, thus, the term "slow" is used to describe this characteristic.
Extra fast, fast, moderate and slow actions refer to flex and ultimately the relative time it takes for the rod to return to the at-rest position once released from under a load. By knowing and understanding the action of a blank, you can utilize that blank's properties to enhance a particular technique.

POWER:

Now that action is understood to describe how a blank flexes, let's look at the blank's resistance to flexing. The resistance to flexing is called Power. Power refers to the blank's resistance to flexing under load. Remember Newton's third law: For every action there is an equal and opposite reaction.
    Resistance to flexing (Power) is an inherent design characteristic based upon the taper and wall thickness of the blank. The power for blanks may range from Ultra-Light to Heavy to even Extra Heavy - the broom handle previously discussed.
    As you can see, Action and Power are not the same and cannot be used interchangeably as some think.
    One other note about Action and Power that further complicates the discussion and understanding is that there are no industry standards used by rod and blank manufacturers to describe Action and Power. You go to a car lot and see a car that gets twenty miles per gallon and goes from zero to sixty miles per hour in twelve seconds. You can then look at another car on the lot and see the car gets twelve miles per gallon and goes from zero to sixty in seven seconds. Right away you can make some distinctions, know what to expect and how it should (or should not) be used when you purchase based upon known, recognized industry standards.
    Fishing rods do not have this "standard". A fast action, medium power St. Croix blank may, and probably will, have different action and power characteristics when compared to a fast action, medium power G. Loomis or Lamiglas blank.
    At this point you are probably thinking, "OK, I get it. Action refers to rod flex and Power refers the rod's resistance to flexing. But how does all this techno-jargon help me catch fish?"
    Using the design criteria and inherent characteristics of a blank will aid in specific techniques and presentations. Using blank characteristics to your advantage will provide you the benefit of making the most out of every opportunity to land fish. Let's add more tools to that toolbox in addition to the hammer.
    The discussion around technique application will center on Action as opposed to Power. Both traits are designed into the blank by the manufacturer, but action will be the most critical characteristic when discussing and evaluating techniques and presentations.

Extra-Fast:

The primary benefits of an Extra-Fast blank are its sensitivity and the quick response to bringing the inherent power of the blank into play when fighting the fish. The Extra-Fast blank will be stiffer, which will transmit vibration to your hand much more efficiently than a slow/soft blank.
    The Extra-Fast blank is a prime consideration for single hook applications where sensitivity is needed to detect the smallest of nibbles, then immediate power to set the hook. Primary techniques for these blanks are worm and jig presentations, spinnerbait and some swimbaits.
    With everything there are tradeoffs.
    Although the Extra-Fast blank provides exceptional sensitivity and efficient access to the power of the blank, the Extra-Fast tip works against you somewhat while fighting the fish. Because the Extra-Fast blank returns to the at-rest position very quickly, the Extra-Fast tip makes it very difficult to maintain proper tension to keep the lure secure.
    As the hooked fish surges and lunges to get loose, maintaining too much tension with a stiff blank could cause the hook to tear a hole in the fish's mouth or make the hole larger, allowing the fish to throw the bait. Too little tension will also help contribute to the fish throwing the lure. When the fish lunges against a loose line, then the line suddenly tightens, the force of the lunge in conjunction with the power of the rod could cause the hook to pull portions of the mouth, lips, or muscles off the fish. Not only could you miss the fish of a lifetime, but worse yet, the fish may be permanently injured.

Fast:

The Fast action blank maintains most of the sensitivity found in the Extra-Fast blank, but given that it is a "Fast" action, has more flex. After hookup, the more flexible tip will provide better fish fighting capability. The tip, and in turn the blank, can absorb more of the shock as the fish surges and lunges and will maintain better tension on the line.
Good applications for fast action rods are techniques where sensitivity is just as important as fighting ability. A primary application for Fast action rods is throwing single hook rigs through and over loose weeds and grass. A more limber, flexible rod would have difficulty generating the needed power to jerk the lure free from weeds and grass.
Presentations and techniques that benefit from Fast action rods are jigs, Texas rigged and Carolina rigged worms.

Moderate to Slow:

The Moderate to Slow action blanks are usually good for multi-hook (treble) lures such as crank baits, rattle baits and jerk baits. These fast moving fish finding baits work best with a soft tip action and the ability to throw the lure over long distances.
    These lures and presentations typically require less sensitivity and focus more on keeping the fish hooked. The wire diameter of the treble hook is typically thinner than a single hook and requires less pressure to set the hook. In addition, given that there are more hooks, there are more opportunities for a good hook set.
    The Slow tip will cause the blank to return to the at-rest position much more slowly than faster action blanks. With this characteristic, proper tension is much easier to maintain, keeping the hook engaged while the fish surges and lunges. The rod is much more adept at reacting to the fish's abrupt actions.
    I remember fishing from the shore one time. I was getting ready to pull my rattletrap from the water when I saw a three-pound Largemouth Bass come darting in, take the bait and swim rapidly away. It happened in the time it probably took you to read this sentence. I didn't have time to react, release the spool, drop pressure, set the hook, etc. Instead, the slow action of the rod allowed the fish to inhale the bait, turn, swim away and set the hook itself while I stood there watching in amazement.
    Obviously, I had not fought it while bringing it to shore, so the fish was ready for a fight! With only a few feet of line out, I had to rely on rod flex to maintain a good hookup, yet give and bend with every lunge, surge and jump the fish made.
    Ok, I am starting to get into fish stories now, so let me close this discussion. This has been a very high level overview for rod action and power. It is meant to cover the basics and how the two characteristics benefit and impact each other for various techniques. Use this information to better equip yourself when on the water AND when choosing a new rod.

www.bassresource.com/fishing/rod-actions-power.html