There is a great video of NASA’s Helios wing aircraft encountering a BAD wind gust while in flight. This is one well designed UAV (Unmanned Aerial Vehicle) to take this gust and not break up in flight.

[Ed: getting to the video is tricky, but you can find it linked in the lower right nav bar of the article titled "Next Century of Flight: Aviation Week's AviationNow.com" (07/31/2001) which is the fourth search result if you search for Helios. There is also a Helios photo gallery and fact sheet on the NASA Web site.]