I got thinking again about how to make a hovercraft very, very quiet
yet still have substantial speed. When I was researching for a small
lightweight boat, I came across a relatively new idea that I had not
seen before. This guy has developed a pedal powered boat that moves
fins back and forth under water. He claims that it is much more
efficient than propellers. There are several videos on the internet
about this system and it seems to work quite well.
http://www.youtube.com/watch?v=VljpEpjVdtshttp://www.youtube.com/watch?v=nmSfqAEp44A
Well, the thought is that I wonder if this sort of system could be
applied to flight thrust? (i.e. the flapping of wings)
