How the Air Knife Works

100_0083 The Supersonic Air Knife converts compressed air from a portable compressor to a supersonic jet stream by use of its specially engineered nozzle. The finely-focused stream of air penetrates the ground to nearly a foot deep and can be aimed to crumble and blast the soil away as fast as the operator moves the tool. Since tree roots, rocks and pipelines are not porous, soil can be excavated quickly with no impact to roots, electrical, and gas lines.

With excavations deeper than a foot we recommend the use of our soil vacuum. The standard Air Knife uses a minimum, of 100 psi/185 cfm compressor. We also have developed larger Air Knives that remove soil deeper and faster for large excavation and decompaction jobs.

Our tools look technical, yet are extremely easy to use. By simply holding the bottom of the barrel directly on the ground and pulling the trigger, you can begin digging anywhere. If you know how to use the recommended safety gear (eye and ear protection) you can use this tool.

Soil moisture can improve the effectiveness of the tool, so irrigating hard clay soils the day before excavation will make the work go more quickly and create a lot less dust. Or use our new liquid injection tools, the X-HFL and the X-LTL.

The new Supersonic Air Knife X-LTL is an air excavator with low-pressure liquid injection capability.  The liquid source can be a municipal water supply via standard garden hose, a tank mounted on a truck or trailer, or it can even draw from a stream or pond.  This allows you to introduce water or other liquid materials to a targeted location in the soil rather than via a surface application.  Liquid is atomized by the air stream as it leaves the Air Knife nozzle, maintaining the gentle digging that an Air Knife is known for.  In addition to applying specific treatments to root systems, water can be used to increase digging efficiency and for dust control in dry conditions.  Turn the water off and use it as you would a standard Supersonic Air Knife. The X-HFL is the same design, but attached to the larger X-HFA “Big Gun”.