Estar Stopper Knot

The EStar Stopper Knot is used to create a bulky, secure stopper at the end of a rope, preventing the line from slipping through blocks, fairleads, or other hardware. It was developed specifically for use with modern high-performance synthetic ropes such as Dyneema, Spectra, and Kevlar, where traditional stopper knots often fail to hold. The knot is also effective with conventional rope when a particularly large or secure stopper is required. Applications include sailing, climbing, rigging, and camping where lines must be secured against slippage under load.

The EStar Stopper Knot was developed by Evans Starzinger, an accomplished blue water sailor who, along with his partner Beth Leonard, completed two circumnavigations totaling over 130,000 nautical miles, including passages around all five great capes and above the Arctic Circle. Starzinger tested various stopper knots for use with slippery modern rope materials and found the EStar to be the only one that did not slip in Dyneema. The name 'EStar' derives from his name (E. Starzinger). The knot is related to the EStar Hitch, which Starzinger also developed for securing lines to bars or rings in slippery cordage.

The EStar Stopper Knot begins with a Buntline Hitch formed around the standing part of the rope. The working end is then passed back down through the Buntline structure so that any slipping would cause the standing end and working end to move against each other in opposite directions. Finally, the working end passes through the loops at the top of the knot, which grip the tail. The resulting structure is bulky and slightly asymmetrical, with a finished profile two to three times larger than the rope diameter. The knot requires a relatively long tail to tie—approximately 12 to 20 inches (30 to 50 cm) for thinner ropes and up to 3 feet (1 meter) for thicker lines.

The EStar Stopper Knot is one of the most secure stopper knots available for slippery synthetic ropes. Its self-tightening structure means that the harder the load pulls on the standing end, the more tightly the working end is gripped within the knot. Starzinger's testing found it to be the only stopper knot that did not slip when tied in Dyneema. The knot is reasonably easy to tie once learned, though the multiple steps can be challenging for beginners. Its primary disadvantage is that it jams severely after heavy loading and cannot be untied—the rope must be cut if the stopper needs to be removed.