Contest 9
Create your own solution for the problem shown below.
Use 3,4,5,6,7,8,9,10 and 11 different pentominoes to form a fence that encloses an area as large as possible.
The pentominoes must be placed on the same plane, and they must touch along the full edge of a unit square and not just at the corners

Our own records with 3,4,5,6,7,8,9,10 and 11 pentominoes are respectively 6,13,24,34,47,62,78,94 and 111
A record-breaking solution to any of the fences is more then welcome!