There were 3 engines located within Samuel in total - one of them was placed beneath the abdomen along with the others at the outer thighs being the supportive engines. This is one distinct design that made the Samuel style mechs identifiable.
Ye Chong was bothered however. While the Blue Winter turned out to be quite a remarkable ranged weapon and the "marksmanship" of lances taught by the great Mu was impeccable on both paper and performance, Ye Chong felt uneasy conducting his fight in this way. It did not feel as comfortable as brandishing cutters like the magnetic blade or the flaming sword. He was fond of the close-combats as if he was born for them.