Green Steam Engine

i was looking for steam engine solution and i found a great steam engine design, it is called Green Steam Engine.
it is based on a flexible rod that allows converting reciprocating movement into rotational movement, and it is very compact.

http://www.greensteamengine.com/licenses.htm

   according to the web site this design efficiency can vary from 24% to 30%, and if special designed it may go up to 70% range.
please view the web site and see the video