Phase 1 was designed as a pilot-education screen. It was not designed to certify a rope, replace aircraft manufacturer guidance, or declare a universal winner. The goal was to compare how different rope families behave when they are tied, loaded, wetted, cycled, and measured as complete aircraft tie-down assemblies.
Test note: These results are from RampWarden's static screening program and are intended to help pilots understand rope behavior before selecting tie-down rope from outside rope suppliers. They are not a certification or universal recommendation.
Six Rope Families Tested
The updated Phase 1 screen compares double braided nylon as an averaged group of three tested ropes, plus polypropylene, 3-strand nylon, double braided polyester, static kernmantle, and 12-strand polyester. The dynamic follow-up set will carry forward five rope families because each offers a useful educational contrast for pilots.
| Rope Family | Static Screen Read | Dynamic Follow-Up Status |
|---|---|---|
| Double braided polyester | Best loaded static movement profile and 0% Wet10 tension drop, with final assembly set as the watch item. | Advance |
| 12-strand polyester | Balanced polyester challenger with good Wet C2 movement, moderate set, and 0% Wet10 tension drop. | Advance |
| Double braided nylon avg. | Best recovery/slack profile among the serious candidates, but the largest Wet10 tension drop. | Advance |
| Static kernmantle | Highest wet/knotted WLL, but cost, stiffness, and system behavior remain watch items. | Advance |
| 3-strand nylon | High movement and high Wet10 drop, but useful as a familiar real-world benchmark. | Advance as benchmark |
| Polypropylene | Very low WLL and very high final set despite a few decent-looking sub-metrics. | Do not carry forward |
Top 10 Things We Learned
Polyester ropes changed the story.
Double braided polyester and 12-strand polyester showed that the static screen is no longer just a double-braid nylon comparison. Polyester rope families may offer lower conditioned wet movement, but recovery and permanent set still have to be evaluated.
Double braided polyester moved the least under conditioned wet loading.
Double braided polyester had the lowest Wet C2 ring-to-ring elongation at 500 lbf at about 3.83%, plus a 0% Wet10 tension drop. That makes it a high-priority rope family for dynamic follow-up.
Low movement is not the whole answer.
Permanent set matters because it can become post-event slack. Double braided polyester moved very little under Wet C2 loading, but its total assembly permanent set remains a watch item for dynamic testing.
Double braided nylon still recovered best among the serious candidates.
The averaged double braided nylon group had the lowest total assembly permanent set among the main candidates, which keeps nylon highly relevant even though polyester looked better on several static movement metrics.
Wet10 added a practical preload-retention lesson.
The Wet10 test showed whether a lightly preloaded rope lost tension when water was added. Double braided polyester and 12-strand polyester showed 0% drop, while double braided nylon averaged the largest drop. That matters because lost tension can become slack.
Static kernmantle was strongest, but strength alone did not decide the screen.
Static kernmantle had the highest wet/knotted 5:1 WLL, but cost, stiffness, and residual system behavior keep it from being a simple answer. It deserves dynamic testing because it is a useful high-strength comparison.
12-strand polyester may be the best balanced challenger.
12-strand polyester combined moderate set, good Wet C2 movement, and 0% Wet10 tension drop. It did not dominate every metric, but it looked balanced enough to justify dynamic testing.
3-strand nylon remains important as a benchmark.
3-strand nylon showed high movement and a large Wet10 drop, so it is not a leading performer in the static screen. It still advances as a practical benchmark because pilots recognize it and may already use it.
Polypropylene should not move forward in this program.
Polypropylene had very low wet/knotted WLL and the highest final set. Even though some individual movement numbers looked acceptable, the total profile did not justify dynamic follow-up for this educational test set.
Dynamic testing should decide what static testing cannot.
Phase 1 narrowed the field. Phase 2 should explain how the selected ropes behave under gust-like loading, peak force transfer, recovery, post-event slack, and snubber interaction.
Selected Metrics Behind the Lessons
| Rope Family | Wet C2 R-R @500 | Total Assembly Set | Wet10 Drop | Wet/Knotted 5:1 WLL |
|---|---|---|---|---|
| Double braided polyester | 3.83% | 16.00% | 0% | 884 lbf |
| 12-strand polyester | 8.33% | 12.60% | 0% | 797 lbf |
| Static kernmantle | 8.36% | 12.91% | 37.0% | 1,158 lbf |
| Polypropylene | 9.41% | 25.01% | 15.0% | 184 lbf |
| Double braided nylon avg. | 10.45% | 9.91% | 60.5% | 1,023 lbf |
| 3-strand nylon | 17.56% | 16.42% | 50.0% | 678 lbf |
Key Takeaway
Phase 1 did not identify one universal best rope. It showed that different rope families behave differently: some move less, some recover better, some retain preload better when wet, and some are useful primarily as benchmarks. The value for pilots is understanding those tradeoffs before choosing tie-down rope.