Quote Originally Posted by chicharronne View Post
I knew I've seen that shape before. On Nat Geo.

warclub.jpg
Nice, some of our fins have been nicknamed 'Patu' fins after maori war clubs.

These wavy edged sword blades used the same principle I'm sure, and the alternative theories for their existence are pretty weak:

http://www.roystuart.biz/2010/06/und...and-whale.html

http://www.roystuart.biz/2010/06/mor...and-whale.html

http://www.roystuart.biz/2010/08/que...-c-curtis.html

http://www.roystuart.biz/2010/08/mor...g-and-fin.html