Airship Sunrise / Solar Powered Thermal Airship

Opposite of winged aircrafts, balloons consume no energy to stay airborne. Sunrise is a thermal airship that is completely solar powered, designed to accomplish aerial missions based on low speeds and long flight duration, such as, patrolling, filming, observations, expeditions, and recreational usage. The lens inside hot-air ballon focus sunlight to heat up air, not only to create lifting, but also to fuel Stirling Engine. Extra energy is stored as heat and motion. Balloon rotates in 2axis to track sun constantly. As helium resources are poorly limited; usage of hot-air significantly reduce operational and infrastructural costs.