100 RPH "Optimus" Delivered By Hatteras The last unit in the 100 RPH series from Hatteras Yachts has been delivered to her owner. This yacht is the fifth yacht in this line and is expected to be the last. The series will be replaced by the Hatteras 105 RPH. This unit is slightly different from the standpoint that it is actually not 100-feet long. "Optimus", as she has been christened, is actually a 107-footer owing to her 7-foot cockpit addition at the stern made to support the owner's fishing endeavours.