Merlin Upperstage Family

The Merlin Upperstage Family is a series of upper stages developed by C7 Aerospace Industries for use on the Eagle rockets. The Merlin Family was later augmented with the creation of the heavy Super Merlin upperstage.

Merlin
The most common variant of the family, the Merlin is used on the Eagle 4 and Eagle Heavy rockets.

Super Merlin
The Super Merlin is a special upperstage built specifically for use on the Eagle Super Heavy. However, it is also capable of being used on the base Eagle 7 in place of the Clipper-Class Shuttle.