Electromechanical air drill is an alternative to the most common ice shallow drill for coring in "dry" holes. The concept of the drill is similar to deep ice electromechanical drills with fluid circulation but instead of fluid pump the air vacuum pump is used to suck ice cuttings to the chip chamber installed above the core barrel. The air from the vacuum pump outlet is ejected into annular space between the drill and borehole walls forming near-bottom air reverse circulation. Tests of the prototype of air drill showed that ROP of 10.5 m/h can be reached in pure ice with impeller rotation of 23,500 rpm.
Electromechanical air drill