Unnamed Earth starship classes
List of unnamed Earth starship classes.

Delta-shaped hull class  
This type of starship was used by Starfleet during the mid-22nd century. The primary hull was triangular in shape, and had two nacelles mounted port and starboard angled upward from and slightly above the hull.

These vessels were equipped with forward and aft phase cannons. ()

This class was also present in the mirror universe. ()

In an alternate 2165 this type of vessel was included in the Earth convoy destined to settle on Ceti Alpha V. ()

Detached primary and secondary hull-class  

This type of starship was used by Starfleet during the mid-22nd century. 

These vessels had a primary and secondary hull connected via the nacelles, which were directly attached to the primary hull and via pylons to the secondary hull. ()