Airship is the first aircraft invented by humans that can be freely controlled. After more than 100 years of development, airship technology has matured, and it is widely used in advertising, communications relay, high-altitude reconnaissance and other aspects. After careful investigation of the status of the airship technology, I found that there is no suitable design of small airship for the closed environment. Generally, most airship is too large to fly in a closed environment; or though the volume is small, its handling is so poor that it can not complete the task excellently. How to design a controllable, high security aircraft to complete the task of closed space has become an urgent problem to be solved. This article will introduce the design and model of an indoor airship, especially the most important propeller structure design in airship design. The propeller is designed to meet the needs of the airship to achieve the former flying, retreat, left and right side flying and rise and fall movements in small space. This paper provides a three-dimensional change in the propeller to equip the airship with three-dimensional vector power, thus achieving high mobility of the airship.
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