In this guide:
- Why an out-of-trim EN-A might behave like an EN-C.
- The hidden danger of "stress-testing" vs. "break-testing" lines.
- Why Dyneema shrinks while Aramid stays stable.
- How to get 50% off your next service.
Why Does Your Glider Actually Need a Service?
It’s easy to look at a crisp wing and think it’s "fine," but paragliders are dynamic wings held together by metres of high-tech string. Over time, UV radiation, humidity, temperature, and mechanical stress change the physical properties of the fabric and lines.
In the UK, our damp climate and coastal salt air can accelerate these changes. A professional service isn't just a "check-up"—it’s a restoration of the wing's intended flight characteristics.
On every glider, there is an information placard with details about the wing, its certification, and suggested service interval. It's important to stick with this recommended interval, as your glider may no longer be in its certified state! This is something that many pilots forget shortly after their CP training.
Our paragliders go through EN certification where they are load and flight tested. The flight testing ensures that your glider will respond correctly and in a timely manner to specific collapses. We suggest looking up your glider's test report on Air Turquoise's website or watching their certification videos on YouTube.
Over time your paraglider lines shrink, but not all at the same rate! Generally, the least loaded lines shrink the most (e.g., your rear lines). When your glider is no longer flying at the designed 'trim,' its flight behaviour differs from what was certified. Your EN-A glider could effectively behave like a higher-category wing. One of the key elements of your service is to measure and reset your glider's trim so that it flies as designed.
What Happens During a Professional Service?
When you drop your wing off at our Wingtrim workshop in Somerset, we perform a multi-point inspection:
- Porosity Testing: Measuring fabric air permeability (the "health" of the coating).
- Bettsometer Test: Checking the physical tear strength of the fabric.
- Line Strength Testing: Breaking specific lines to ensure the entire set meets safety margins.
- Visual Inspection: Checking the entire glider for hidden damage or internal rib failure.
- Trim Check: Measuring and adjusting the lengths to ensure the wing flies at the manufacturer's designed angle.
The Science of Trimming: Dyneema vs. Aramid
Trimming is the most overlooked part of glider maintenance. Most modern wings use a mix of materials, and they "age" differently:
- Dyneema Lines: Incredibly strong and durable, but prone to shrinking over time, especially on the rear (C and D) lines.
- Aramid (Kevlar) Lines: Maintain length much better but can lose tensile strength without showing visual wear.
When your rear lines shrink, your glider’s "Angle of Attack" increases. This makes the wing sluggish, harder to launch, and more prone to deep stalls. At Wingtrim, we use a precise laser tool to reset your glider with very tight tolerances, making an old glider feel "crisp" and brand new again.
Why Break-Testing Lines is Critical (The Wingtrim Difference)
The PMA (Paraglider Manufacturers Association) has set rigorous standards for line safety. We ensure all testing meets these international benchmarks by removing a line, replacing it with a custom-made line to correct specification, and breaking the old one to determine its actual strength.
How we differ: It is vital to break the lines, not just "stress test" them to a set limit. When a line is pulled to a limit but doesn't break, you cannot determine internal fibre damage or how the test itself affected the line. Ensure your workshop breaks a line and never re-installs a tested line back on your glider.
Buying Second Hand? Read This First.
Buying a used wing is a great way to save money, but never buy a second-hand wing without a recent service report from a reputable workshop. While there are other established UK workshops like Aerofix or The Loft, the most important thing is that the report is current (within the last 12 months) and detailed. Every second-hand wing sold through the Sky Riders Shop comes with a full, transparent service report. We don't sell "mystery" wings.