【The Final Conclusion on Lines】 Why is Eging a Choice of Only "0.6 PE"? The Physics of "45-Degree Stability" Derived from Fluid Dynamics
Hey, future eging meisters. Are you still staring at the back of the package in the fishing tackle shop's line section today?
"0.8 PE is safer because it's harder to break." "The shop clerk said beginners should use thicker lines..."
......Sorry, but if that “cowardly mental block” is the root cause lowering your catch rate, what are you going to do? Let me be clear. In the current eging scene, any choice other than 0.6 PE is physically almost a “loss.”
"Huh? If it's thin, it'll break! 0.8 PE is definitely stronger!" If you wanted to retort like that, it's proof that you still see the line as nothing more than “a piece of string.” In eging, the line is not just a lifeline. It is “a part of the physics calculation engine” that controls the posture of the egi underwater and gives the squid the signal to strike.
Why do advanced anglers all use 0.6 PE? It's not a shallow reason like “because it casts further.” Within it exists the Fluid Dynamics that derived “the necessity to stabilize the egi in the most catchable posture (45 degrees).”
Today, I will ignore all the mental arguments overflowing in the streets about how “thicker is safer.” I will completely prove why 0.6 PE is the strongest physical solution using only data on “drag coefficients” and “mechanics of materials.” When you finish reading this, the 0.8 PE spooled on your reel should look like nothing more than a “lump of resistance.” Are you ready? The lesson on line selection begins.
01. 【Fluid Physics】 The biggest reason “thick lines” don't catch fish isn't the “wind.” It's the “water.”
When a crosswind blows at the fishing spot, you guys think, “Ugh, the wind is bowing the line and I can't fish.” So, you struggle by switching to heavier egi or lowering your rod tip to fight against the wind.
However, from a physical perspective, I have to say you are misidentifying your opponent. The biggest disadvantage of a thick line is not that it gets caught by the wind in the air. It is the fact that the line underwater continues to receive “massive resistance” called ocean currents.
Forget about the air resistance (wind) for a moment.
First, hammer these values into your brain. In fluid dynamics, the “density” of a fluid (air or water) is directly linked to resistance force.
Density of air: approx. 1.2 kg/m3
Density of seawater: approx. 1000 kg/m3
Do you understand? Water is about 833 times denser than air. In other words, if a line of the same thickness moves at the same speed, the resistance it receives underwater is more than 800 times greater than the resistance it receives in the air.
Of course, if the wind speed is 10 m/s, it's a different story, but when calculated under general conditions (wind speed 5 m/s, current 1 m/s), the dominant factor in the total resistance the line receives is overwhelmingly the “underwater resistance.” There are guys who use thick lines because “the wind is strong,” but that is suicidal behavior. The moment a thick line enters the water, it puts a “brake” on your egi many times stronger than you imagine.
The dominant factor is “underwater resistance.”
Here, the physical concept of “Projected Area” becomes important. It refers to the area that water hits when the line is placed perpendicular to the water flow.
"0.6 PE (standard diameter 0.128mm) and 0.8 PE (0.148mm), that's only a 0.02mm difference, right?" Did you think that? Naive. When this slight 0.02mm difference is released 30m or 40m into the water, how much of a difference do you think it makes in terms of total projected area?
Calculations show that 0.8 PE has about 13% more underwater resistance than 0.6 PE. Only 13%? No, this difference is fatal.
❌ Thicker lines (0.8 PE or higher): They take the full force of water resistance, turning the entire line into a giant 'underwater kite.' The force of this kite being pulled by the current forces the light squid jig to rise. As a result, you can't reach the bottom and lose track of what you're doing.
⭕️ Thinner lines (0.6 PE): Because the projected area is small, it conforms to the water as if 'cutting' through it. With less resistance, it doesn't interfere with the jig's natural sinking motion, and direct control is transmitted to your hand.
Poor sensitivity isn't the fault of your rod or your skill. It's because that '0.8 PE for peace of mind' you chose creates obstructive resistance underwater and blocks the transmission of information. 'Cut the water.' That is the iron rule of eging physics.
02. [The Science of Posture] The 'Golden 45-Degree Angle' and Parachute Effect Led by 0.6 PE
'Well, if less resistance is better, wouldn't dropping to 0.4 or 0.3 PE be the best?' Anyone with a sharp mind would think that. But the world of physics isn't that simple. Here, there exists the cold, hard rule that 'too much is as bad as too little'.
I'll give you the conclusion. In eging, 0.4 PE or lower is 'too light (too little resistance)'.
The reason why 0.4 PE is no good (the sin of being too light)
The most important thing in eging is to maintain the '45-degree posture' that makes it easy for squid to grab during the fall. To create this 45 degrees, you need to apply 'appropriate braking (pulling force)' from the line side against the falling jig.
What happens if you use an ultra-thin 0.4 PE line? Underwater resistance becomes extremely small (about 18% less compared to 0.6 PE). As a result, the brake doesn't work, and the jig 'plummets' head-first, following gravity.
Posture collapse: A steep, head-down fall looks like an 'unnatural movement' to a squid.
Reduced hang time: It hits the bottom in an instant, so you don't gain enough time for the squid to 'calculate' its strike.
The people who use 0.4 PE because 'the sensitivity is good' are the very ones who don't realize that the fall is too fast and they are leaving the squid behind.
The 'appropriate brake' created by 0.6 PE
Here comes the star of the show: 0.6 PE. According to research data, the resistance that 0.6 PE receives underwater is about 0.38N. In eging, this value creates a miraculous 'parachute effect'.
The moment you enter a tension fall, 0.6 PE receives appropriate resistance underwater, drawing a gentle curve (slack). This resistance acts as a 'gentle, slightly upward pulling force' on the sinking jig.
Gravity: The force trying to sink the jig.
Drag (0.6 PE): The braking force that tries to lift the head of the egi.
When these two forces are physically in equilibrium, the egi is automatically locked into a '45-degree posture' and sinks while sliding at an ideal speed (approx. 1m/s).
With 0.8 PE, the resistance is too high and the egi lifts up too much. With 0.4 PE, there is too little resistance and the egi falls too fast. Only 0.6 PE physically reproduces the 'catchy fall' regardless of who uses it. This is the true meaning of what I said when I called 0.6 PE 'a part of a physics calculation device'.
03. [The Reality of Strength] 'Fear of snapping' is just a delusion
'But hey, won't it snap if a big squid hits when using 0.6 PE?' Are you still talking nonsense like that? Listen, the fear you're holding onto is 'just a delusion' with no physical basis. I'll present the data and wake you up.
Bigfin reef squid are not subjected to a 3kg load
First, know the attack power of your enemy (the bigfin reef squid). The pull of a bigfin reef squid is intense, but it's a momentary pulse load caused by 'jet propulsion'. It doesn't keep running for tens of minutes like a tuna. In actual eging, the drag setting is usually around 0.8kg to 1.0kg. That's because it's set to let out a little line when you jerk the rod.
In contrast, what do you think the average linear strength of standard 0.6 PE (4-strand to 8-strand) is? It's about 12lb to 14lb (5.4kg to 6.4kg).
Drag load: 1.5kg at most (a level where the flesh would tear even if the drag is tightened hard)
Line strength: 5.4kg or more
Do you get it? Against the squid you are trying to catch, the strength of 0.6 PE is already 'over-spec by more than 3 times'. Even if you're up against a 2kg or 3kg Red Monster, as long as the drag is functioning, it's physically impossible for the line to be snapped. 'Worrying about strength' is the same as a nervous old man who won't be satisfied unless he takes a 10x safety factor.
What breaks is not the 'line' but the 'knot'
'But I actually had it snapped with 0.6 PE!' There are some who want to argue that. But try to remember exactly where it snapped. 'The knot with the leader' slipped out, or didn't it snap at 'the snap knot'?
90% of the causes of line breaks are not the thickness of the line. It's your 'lack of skill in knotting'. PE line loses strength at the knot. If it's a sloppy overhand knot, it drops to less than 50%. Conversely, if you tie a proper friction knot like an 'FG knot' or an 'SC knot', you can maintain nearly 90% of the strength.
❌ 0.8 PE x sloppy knot: Strength approx. 3.5kg (high risk of slipping)
⭕️ 0.6 PE x perfect FG knot: Strength approx. 5.0kg (stable)
Before you run away to thicker line for peace of mind, practice your knots first. By the way, with 0.6 PE, if it's a medium snag (seaweed or light rocks), it has enough strength to straighten the hook and retrieve it if you pull slowly. If you're 'afraid of it snapping', don't make it thicker, tie it stronger. That is the physically correct solution.
▼ If you can't tie a knot, get a knot assist tool
Manual or electric, it doesn't matter. If knots are difficult, get a knot assist tool. Losing valuable squid jigs or leaders due to a poor knot ends up costing more in the long run.
04. [The Golden Ratio] The Optimal Solution for a 'Leader' to Maximize 0.6 PE
To draw out 100% of the potential of 0.6 PE, the balance with the 'shock leader' tied to the end is life or death. If you choose the wrong thickness or length here, all that 'physical advantage' you worked for will go down the drain. I'm going to teach you the "Golden Ratio" to make the most of your main weapon, the 0.6 gauge.
Don't break the balance. Choose '2.0 to 2.5 gauge'
Some guys think 'thicker leaders are safer' and tie a 3.0 gauge (12lb) or heavier leader to a 0.6 PE line, but that is "the height of imbalance." The leader (fluorocarbon) has a higher specific gravity (approx. 1.78) and is stiffer than PE line. If you make it thicker than necessary, that section becomes a "heavy anchor" that forces the head of the jig down or gets caught in the current, causing it to drift unnaturally.
The physical optimal solution for knot strength against 0.6 PE (approx. 12lb-14lb) is "2.0 gauge (8lb) to 2.5 gauge (10lb)".
2.0 gauge (8lb): Sensitivity-focused. Low resistance, doesn't interfere with the jig's movement. This is best for breakwaters with few obstacles.
2.5 gauge (10lb): Strength-focused. Use this if you want to handle some abrasion in rocky areas or tetrapod zones.
Making it any thicker just hits a ceiling in strength at the knot with the PE, and making it too thin means the leader will break first. "Match the strength of the main line and the leader." This is the physical law of knots.
▼ Recommended Leaders
You can't go wrong by choosing either of these based on your usual spots. Pink, which is invisible to squid, works very well.
Is the length '80cm' or '1.5m'?
The next thing to wonder about is length. Textbooks say 'take 1 hiro (approx. 1.5m),' but that isn't always the right answer depending on the situation. Use them differently based on physical pros and cons.
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⭕️ Short Leader (80cm to 1m):
Pros: You can cast with the knot outside the guides. Since guide interference (resistance) becomes zero, casting distance increases and line trouble is drastically reduced.
Recommended: Beginners, windy days, when you want casting distance.
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⭕️ Long Leader (1.5m+):
Pros: Leverages the high specific gravity of fluorocarbon (1.78) to act as a 'weight' that sinks the buoyant PE (0.98) into the water role. It also serves as insurance in areas with a high risk of snagging on rocks.
Recommended for: High fishing spots, rocky shores, and when the PE line floats too much due to wind.
My recommendation is this. First, try setting it up with 1.5m. If the knot hits the guides during casting and it's annoying, don't hesitate to shorten it to 80cm (within the drop range). If you can't nail your cast, you can't fish.
【Extra Edition】 3 'Strictly Recommended' Lines That Won't Mess Up Your Physics Calculations
If you've read this far, you should already know. What's important in choosing a line isn't how cool the packaging looks. It's the physical specs: 'roundness (ease of cutting through water)', 'uniformity of thickness (stability of strength)', and 'resistance to water absorption (maintaining weight)'. Many lines from mystery manufacturers found in bargain bins are 'defective products'—even if they are labeled as 0.6, they might actually be 0.8 in reality, or they flatten out quickly and catch water. I won't tell you anything bad. If you're lost, choose from these three. I physically guarantee them.
1. 【The Pinnacle of Physical Specs】 YGK 'X-Braid Upgrade X8 Pentagram'
If you're the type who thinks 'all lines are the same,' try using this once. It will change your world. Honestly, YGK's technical prowess is a cut above the rest. What's worth noting is the overwhelming 'roundness' and 'dense braiding'. Because the surface is smooth and nearly perfectly round, guide resistance and underwater resistance are kept to an absolute minimum. In other words, it's a line that provides the most 'calculated' fall according to fluid dynamics. There is almost zero variation in strength. If your budget allows, choosing this will give you an environment where you have no excuses.
2. 【The Cost-Performance Bug】 Shimano 'Pitbull 8+'
For those of you who are practical and think, 'YGK is good, but I can't spend that much on a consumable,' this is for you. It's braided using Shimano's 'VT Construction' method, so despite being cheap, it has stiffness and cuts through water well. What's worth noting is its 'cost-performance'. Rather than being stingy with an expensive line and using it for half a year, replacing this every two months will keep the physical freshness (coating and smoothness) at a much higher level. If you want to fight with 'new physical properties' at all times, this is a great choice. *Make sure to choose the stiff '8+' version, not the standard Pitbull.
3. 【Cutting Through the Wind】 Duel 'Armored F+ Pro' Eging
This isn't a pure PE line. It's a 'composite line' with fluorocarbon particles coated around the PE. Do you know what's amazing about this? It's the specific gravity. Normal PE has a specific gravity of about 0.97 and floats on water, but this one has a specific gravity of 1.0. It's almost the same as water. This slight difference is effective on windy days or when the tide is fast. It blends into the water exceptionally well, and because it forcibly sinks the line into the water, it's easy to physically cancel out the effects of the wind. If you're a beginner struggling with wind, or if you value 'operational feel' over casting distance, this will be your strongest weapon.
Summary: Build a Line System as a Physics Calculation Device
I've talked for a long time, but the conclusion is simple. Don't choose a thick line based on the emotional argument that 'it might snap.' Don't choose a line that's too thin out of greed because you 'want maximum sensitivity.'
Underwater resistance (water cutting)
Fall posture (45-degree stability)
Practical Strength (Against Kilo-plus)
The only solution where these three physical parameters intersect at the highest level is PE 0.6 line. The reel you are holding in your hand is not just a machine for winding line. It is a physical computing device for conveying underwater information to your hand and precisely controlling the bullet that is your egi. If you connect an oversized, thick cable (0.8 or higher) to that device, its performance will naturally plummet.
If you currently have a rope of 0.8 or thicker wound on your reel, I won't tell you anything bad. Go to a fishing tackle shop right now and have it respooled. That 'mere 0.02mm' of slimming down will teach you the feeling of 'Wait, is the egi moving on its own to catch fish?' on your next fishing trip.
📖 Solve all your eging questions right here.
What kind of egi should I throw next? Where should I target during this season?
When you are lost at the fishing spot, what you should rely on is not your intuition, but solid 'logic'. The following article is an eging 'dictionary' that condenses all the know-how I possess into 5 chapters and 21 articles. Whenever you are in trouble, come back here. The answer is always here.
▼ [Complete Coverage] Eging Strategy Complete Guide | Summary Article of All 21 Chapters
Frequently Asked Questions (FAQ)
For those of you who are argumentative, I will crush the common questions at the end.
Q1. Is it okay for a beginner to use 0.6 right away?
Conclusion: It is okay. In fact, since you won't develop bad habits, you will improve faster.
Saying 'beginners should start with 0.8' is just coddling them to avoid practicing knots. If you use 0.6 from the start, you will have a sense of crisis that 'you can't force it out if it gets snagged,' so you will naturally acquire the ability to avoid snags. Furthermore, because the sensitivity is good, you can clearly tell 'Oh, it hit the bottom.' Instead of wasting time with '0.8 where you don't know what you're doing,' earn experience points from the start with '0.6 that has a lot of information.' That is the shortest route.
Q2. Between 4-strand and 8-strand, which is physically more advantageous?
Conclusion: For fluid dynamics (casting distance and water shedding), it's '8-strand'; for wind resistance and cost-performance, it's '4-strand'.
8-strand is smooth on the surface and close to a perfect circle, so there is less guide resistance and underwater resistance, resulting in greater casting distance. If you are pursuing physical specs, this is the one. However, 8-strand is so supple that it has the weakness of easily tangling in the guides when the wind is strong. In contrast, 4-strand has thicker individual filaments, so it has 'stiffness (tension).' It is less likely to be blown by the wind and is easier for beginners who are afraid of line trouble to handle. If you are unsure, consult your wallet and decide. There is certainly a difference in performance, but it is not as fatal a difference as choosing the line size.
Q3. What is the difference between expensive line and cheap line?
Conclusion: The durability and 'uniformity of thickness' are worlds apart.
You might think, 'If it's the same 0.6, isn't the cheap one fine?' But cheap products often have their coating peel off immediately, fray, and absorb water, expanding to 'effectively 0.8.' Furthermore, if there is unevenness in thickness, the strength drops at that point. Expensive lines (like Pitbull 12 or Upgrade X8) will remain '0.6' even after long-term use. If you don't want to mess up your physical calculations, you won't be punished for investing a little here.