Solar plane that challenges satellites
An aircraft that is solar-powered and capable of flying for months on end at 100,000 ft is to make its maiden flight this summer. The Helios, which has a wingspan of 247 ft - 50 ft wider than a
An aircraft that is solar-powered and capable of flying for months on end at 100,000 ft is to make its maiden flight this summer. The Helios, which has a wingspan of 247 ft - 50 ft wider than a