The variable geometry pylon was a feature first introduced to Federation starships around 2371. The Intrepid-class starships were equipped with this feature.

The warp nacelles had the ability to be raised into position for warp speeds, and then lowered into a more streamlined position when at slower-than-light speeds. The goal of these pylons was to improve engine efficiency by optimizing field stress when the ship travels extended journeys at warp 8+ velocity, resulting in significantly improved engine efficiencies.