A typical ship of this type had two outboard nacelles and an inboard nacelle. These nacelles were connected by swept pylons to the underside of the primary hull. Similar to the Miranda-class starship in the regular reality, an Armstrong-type starship was equipped with a rollbar supporting a multi-tube torpedo launcher. Extending from the trailing edge of the primary hull, and connected to the rollbar by smaller pylons, there was a structure housing the impulse drive.
A year later, before the USS Enterprise proceeded on its mission to Qo'noS. two ships of this type were seen at or near Starbase 1. One of these ships, a brown hull variant, was holding station, while its sister ship was assigned to berth B3. (Star Trek Into Darkness)