SOUTH SIOUX CITY -- A sailplane once collecting dust has been restored to its original condition by area soaring enthusiasts and is once again in the skies over Siouxland.

Using two coherent broadband fibre-laser frequency comb sources, a coherent laser ranging system for absolute distance measurements is demonstrated. Its combination of precision, speed and long ...

The pressurized, high-altitude Perlan 2 sailplane performed a short flight Tuesday at EAA’s AirVenture in Oshkosh, Wisconsin. [Photo: Thom Patterson] Perlan 2, the record-setting, pressurized ...