Illusive elastic powered Ornithopter

Hi I wonder if you can help me,

I saw a programme recently that featured small elastic band powered
ornithopter. As a result every creative bone in my body wanted to make
one right there and then. However I cant find plans for one any where.
The one I saw was about 20 inches long and thats about the size I'm
after.


If anyone has any plans that I can use or know where theres some
online please tag it onto this thread.


Thank you all for your time

Mike