The 4-Inch Drill is an electromechanical ice coring drill that takes a 104 mm diameter core. Cores can be retrieved from depths down to approximately 400 meters. Winches with 100-, 200-, and 400-meter cables are available. The drill is of a mature design and has been used successfully for several decades. It is particularly useful on projects requiring a larger diameter core than produced by the Badger-Eclipse drills. Depending on configuration, the drill can be transported by light aircraft or helicopter.
An electrothermal version of this drill, which melts an annulus around the core, can be substituted for use in ice warmer than -10° C. Both versions use core dogs to break the core off and hold it for retrieval.
IDPO-IDDO is in the process of upgrading the 4-Inch Drill design. The upgraded drill design is referred to as the Foro Drill ('Foro' is Latin for "to bore, make a hole"), and the design of its sonde, winch, and tower reflects beneficial aspects of the Intermediate Depth Drill (IDD) design. In addition, the Foro Drill's new sonde design will also be submersible and watertight.
|Number in Inventory||2|
|Max. Practical Depth||300-350 m|
|Hole Diameter||145 mm (5.7 inches)|
|Core Diameter||104 mm (4 inches)|
|Core Length||1 m|
|IDDO Driller Required?||Yes, 2 drillers|
|Drill Fluid Required?||No|
|Power Requirements/Source||220 V, 5 kW generator|
|Estimated Drilling Time||100 m - 30 hours
150 m - 50 hours
200 m - 75 hours
|Time to move (breakdown and setup)||6 hours|
|Light Aircraft Transportable?||Yes|
|Shipping Weight||2600 lbs|
|Comments||Complete unit operating is ~1000 lbs. Heaviest component is winch (on sled) at ~500 lbs.|