The UFO 21 can be flown at a range of 75-90kg within EN-B. Up to 120kg the glider has achieved an EN-926-1 (load-tested certification).
During the development of the UFO, product longevity was a foremost consideration for us at AirDesign. Due to the fact that there is no supporting lower sail, the internal ribs are supporting higher loads, compared to that of conventional gliders. As with normal glider material, this internal rib material is equally susceptible to ageing, however, these ribs are normally located inside the glider – well protected from upper and lower sail.
Keeping this in mind, we have supported all ribs with extra edging tape. The amount of extra work in production associated with applying this feature is similar to sewing a conventional glider with a bottom surface. Still, we were able to keep the weight incredibly low – with 1.6kg at size 14.