Dhelan class

Dhelan class Warbirds were vessels designed by the Romulan Star Empire and used by them in the early 24th century. These craft were heavily used by the Romulans to the point that they served as a model for many future classes including the Mogai class. Such ships actually maintained a significant advantage over many modern starships. The Dhelan class were not only larger than the T'Liss class Light Warbirds but also sturdier which was an aspect of the design that allowed them to carry heavier armaments. However, this came at the cost of mobility which was the reason the Dhelan class Warbirds suffered from poor maneuverability and impulse speeds. (STO website: Legacy of Romulus Dev Blog #3)