The new model DST has been created for the most binding National and International challenges and belongs to the second generation of engines intended for the OK category: this model has the same important technical and sporting features of its winning forerunner, the DDS, developing every single detail. This project, totally new, involved the technical division of Vortex towards the achievement of three important targets: lightness, reduced dimensions, lowering of the center of gravity and a refined research in materials and in the weight and cargo distribution. To obtain these results, the crankcase has been redesigned together with fundamental components such as, crankshaft, balance shaft and connecting rod. The balance shaft is now working in the air and no longer in a chamber filled with oil, allowing a further friction reduction. The new crankcase design is more compact and stiffer, like never before.