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Armstrong-type starship, USS Armstrong
The Armstrong-type was a type of starship used by Starfleet in the mid-23rd century in the alternate reality.
A typical ship of this type had two active outboard nacelles and a 'dummy' 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, a 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. This type participated in the pivotal Battle of Vulcan in 2258, and was named after the USS Armstrong. (Star Trek)