content: Not only that but it's inherently a high drag design. So it's limited to fairly slow, heavy lift applications. This rules out the majority of the world's uses for aviation. One of the exceptions here may be in agriculture for herbicide and fertilizer application. But its failure mode makes even this unlikely. As bird strikes are somewhat common for ag pilots. Here, a bird strike can asymmetrically destroy lift. This combined with low altitudes means an almost certain death for the pilot as he goes inverted and spirals into the ground. This is a technology in search of a solution.