Pirat

Pirat is a sailing boat designed by Carl Martens in 1938, who want to be just sailing with a balanced boat. 

It has similarities with the other class boats like the spinnaker, pulley system..etc. Also nowadays quite easy to find materials of the Pirat boat in Turkey as well.  

Although it is not an olympic class but most of the sailors preferred, so there are lots of organizations in European countries.