New Fifty Unveiled By Mulder Mulder has a new vessel in the works that they recently revealed. It is called the Mulder Fifty. Although it is a slightly different looking vessel at its core it is still an evolution out of the popular ThirtySix model. Mulder revealed the new design during their 85th anniversary celebrations. At 49.95-meters the vessel's internal volume is kept just below the 500 GT mark (499 GT). The yard will continue to use ThirtySix model elements in the design to keep costs down on the new model.