Helicopter D-HBGR with Bird
Helicopter D-HBGR with bird starting for groundwater exploration in Northeast-Namibia. Helicopter electromagnetics (HEM) usually applies a drag-system with a bird. The EM-system, presently working with 6 measuring frequencies, is installed in the about 10-m long bird, which is dragged by the helicopter 30 – 40 m over ground on a cable 45 m long.
Source: BGR
