Are EN C 2-Liners the future of sports class paragliders, or are they just a passing fad? What's the secret behind EN C 2-Liners? Who are they for? Let's discover the main advantages and disadvantages together in this new Flybubble video.
Important to mention:
- Folding lines (simulating collapses).
EN C 2-liner paragliders used "folding lines" (aka "collapse lines") to pass their EN flight certification tests. To get EN C behaviour with EN C 2-liners when simulating collapses, you need to use folding lines. So for SIV you need to invest extra money and time to buy and fit these. This applies to all wings that used folding lines to pass certification.
- Descent techniques (getting down).
Getting down on 2-liners is generally more demanding than 3-liners. Many 2-liners either don't do big ears or do them badly, with more instability and a higher risk of getting a cravat or knot in the lines. Many 2-liners can do the tip stalls (aka B3, B-ears, bunny ears) but not all of them. Some can't do either big ears or tip stalls. Some do tip stalls well whilst others are very physical, often with a very thin line, cutting into your hands. This is where the extra performance of 2-liners can turn into a negative: they want to go up more and are harder to get down.
- High G-forces (spirals, auto-rotation).
Generally with higher-performance wings, which are generally faster and have longer lines, the G-forces involved when spiralling are higher. This means higher discomfort (unless you enjoy the high Gs) and an increased risk of blacking out. This is why many 2-liner pilots choose to fly with a drag parachute, to reduce the G-forces when spiralling (or increase the descent rate with less G).
- Trimming (fewer lines to take the load).
More performance-oriented wings tend to have fewer lines. This is one of the main reasons for 2-liners. However, fewer lines means more load on each line. This means the lines are more prone to going out of trim more or failing, over time and especially in high G situations e.g. spirals, auto-rotation, violent collapse recovery. More performance-oriented wings tend to require better care and more frequent servicing and retrimming, to ensure they fly and behave as they should. especially 2-liners. To compensate for the fewer the lines, the 2-liners tend to be thicker, slightly reducing the performance advantage over wings with more lines.
- Collapse and instability behaviour.
All paragliders can collapse, including 2-liners. 2-liners tend to be more collapse resistant but react more radically to collapses and give less warning. They also tend to require more precise input to recover, be less forgiving or wrong input, and have more chance of getting into an irrecoverable situation e.g. cravat or extremely high Gs meaning the pilot is unable to give corrective input or risks blacking out, so they have to through their reserve (if they can).
More info about EN-C 2-liners is mentioned here:
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