Actual hang gliders produced by nature.
http://news.bbc.co.uk/earth/hi/earth_ne ... 391345.stm
"..They found that design of the seed is so good that it achieves a descent angle of just 12 degrees, a property that has led to the seed's shape inspiring the design of aircraft.
That means it falls just 0.4m each second, compared to 1m per second for many winged seeds that rotate as they fall. .."
Vine seeds become 'giant gliders'
Moderator: Chip
