“As a small aircraft owner, I have owned or borrowed most of the available tie-down products such as “The Claw”, “Storm Force” and “FlyTies”. They each have minor design differences and provide some amount holding force if used correctly, but I never really liked or trusted the one thing they all share in common, the nail like spike providing the grip to the ground.
A nail works great in wood because of its solid nature and high surface
compression, however the ground doesn’t provide that same strong hold on a
nails smooth surface. In fact, a spike or nail can pull straight out quite easily
from the ground. For a grip that doesn’t easily pull out, a helix, screw design would be a much better choice. By its inherent design, a screw provides a significantly larger ground contact area and compression greatly increasing its holding ability.

The obvious advantages of a large screw based tie-down seemed like the solution I was looking for but there just weren’t any quality products available that I would entrust my plane to. This led to me to develop my own tie-down, the Big-Screw EZ Tie-Down.”

Greg Palmer – Designer of the Big-Screw EZ Tie-Down