Tensairity is a novel light weight structural concept. The main idea is to combine the lightness and simplicity of an airbeam with the load bearing capacity of a truss structure. The first developed Tensairity structure has the shape of a cylindrical beam, where the inflated hull is reinforced with a strut and two cables. The cables are spiralled around the hull and connected at both ends with the strut. The air-pressure in the hull pretensions the cables and stabilizes the strut against buckling enabling an optimal use of the materials in the beam. Tensairity structures combine minimal weight with a very high load bearing capacity. They do have a compact transport volume and can be fast and easy deployed. Ideal applications of the Tensairity technology are temporary structures such as tents and paddocks, permanent and temporary bridges as well as medium to wide span roof structures.