> ... you may have the wing on the wrong end =A0:) > http://www.newscientist.com/article/mg20527533.200-oceanology-robot-glide= rs-swim-the-undersea-world.html A very cute idea. I think a wing sail MAY be easier to do, and average velocity should be MUCH higher. Their machine would do circumnavigation at equator distance in 7 months at full speed. Land crossing smay pose a challenge :-). -- = http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist