In recent times there's been a resurgence of interest in airships for military and commercial uses as evidenced by Lockheed Martin's High Altitude Long Endurance-Demonstrator (HALE-D) and Hybrid Air Vehicles heavy-lift variant of Northrop Grumman's Long-Endurance Multi-Intelligence Vehicle (LEMV). Like HAV's design, this concept from Canadian company Solar Ship is a hybrid airship that relies on aerodynamics to help provide lift, and like the HALE-D, it would have its top surface area covered in solar cells to provide energy and minimize its carbon footprint.
Although the Solar Ship aircraft would be filled with helium, under normal circumstances they would rely on the aerodynamic lift provided by their wing shape to provide more than half the lift required to get them off the ground. Additionally, the aircraft could also fly when filled with plain old air. This means the aircraft will still be able to fly - and, more importantly, land safely - if there is damage that results in helium loss.
Solar Ship says the aircraft's electric motor can either be powered solely by the energy provided by the on board batteries, or by the solar panels covering the wing - a feat already achieved by a conventional airplane design in the form of Solar Impulse.
